net/http/http_network_transaction.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "net/http/http_network_transaction.h"
   6
   7 #include <set>
   8 #include <vector>
   9
  10 #include "base/bind.h"
  11 #include "base/bind_helpers.h"
  12 #include "base/compiler_specific.h"
  13 #include "base/format_macros.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/metrics/field_trial.h"
  16 #include "base/metrics/histogram_macros.h"
  17 #include "base/metrics/sparse_histogram.h"
  18 #include "base/profiler/scoped_tracker.h"
  19 #include "base/stl_util.h"
  20 #include "base/strings/string_number_conversions.h"
  21 #include "base/strings/string_util.h"
  22 #include "base/strings/stringprintf.h"
  23 #include "base/time/time.h"
  24 #include "base/values.h"
  25 #include "build/build_config.h"
  26 #include "net/base/auth.h"
  27 #include "net/base/host_port_pair.h"
  28 #include "net/base/io_buffer.h"
  29 #include "net/base/load_flags.h"
  30 #include "net/base/load_timing_info.h"
  31 #include "net/base/net_errors.h"
  32 #include "net/base/net_util.h"
  33 #include "net/base/upload_data_stream.h"
  34 #include "net/http/http_auth.h"
  35 #include "net/http/http_auth_handler.h"
  36 #include "net/http/http_auth_handler_factory.h"
  37 #include "net/http/http_basic_stream.h"
  38 #include "net/http/http_chunked_decoder.h"
  39 #include "net/http/http_network_session.h"
  40 #include "net/http/http_proxy_client_socket.h"
  41 #include "net/http/http_proxy_client_socket_pool.h"
  42 #include "net/http/http_request_headers.h"
  43 #include "net/http/http_request_info.h"
  44 #include "net/http/http_response_headers.h"
  45 #include "net/http/http_response_info.h"
  46 #include "net/http/http_server_properties.h"
  47 #include "net/http/http_status_code.h"
  48 #include "net/http/http_stream.h"
  49 #include "net/http/http_stream_factory.h"
  50 #include "net/http/http_util.h"
  51 #include "net/http/transport_security_state.h"
  52 #include "net/http/url_security_manager.h"
  53 #include "net/socket/client_socket_factory.h"
  54 #include "net/socket/socks_client_socket_pool.h"
  55 #include "net/socket/ssl_client_socket.h"
  56 #include "net/socket/ssl_client_socket_pool.h"
  57 #include "net/socket/transport_client_socket_pool.h"
  58 #include "net/spdy/spdy_http_stream.h"
  59 #include "net/spdy/spdy_session.h"
  60 #include "net/spdy/spdy_session_pool.h"
  61 #include "net/ssl/ssl_cert_request_info.h"
  62 #include "net/ssl/ssl_connection_status_flags.h"
  63 #include "url/gurl.h"
  64 #include "url/url_canon.h"
  65
  66 namespace net {
  67
  68 namespace {
  69
  70 void ProcessAlternativeServices(HttpNetworkSession* session,
  71                                 const HttpResponseHeaders& headers,
  72                                 const HostPortPair& http_host_port_pair) {
  73   if (session->params().use_alternative_services &&
  74       headers.HasHeader(kAlternativeServiceHeader)) {
  75     std::string alternative_service_str;
  76     headers.GetNormalizedHeader(kAlternativeServiceHeader,
  77                                 &alternative_service_str);
  78     session->http_stream_factory()->ProcessAlternativeService(
  79         session->http_server_properties(), alternative_service_str,
  80         http_host_port_pair, *session);
  81     // If there is an "Alt-Svc" header, then ignore "Alternate-Protocol".
  82     return;
  83   }
  84
  85   if (!headers.HasHeader(kAlternateProtocolHeader))
  86     return;
  87
  88   std::vector<std::string> alternate_protocol_values;
  89   void* iter = NULL;
  90   std::string alternate_protocol_str;
  91   while (headers.EnumerateHeader(&iter, kAlternateProtocolHeader,
  92                                  &alternate_protocol_str)) {
  93     base::TrimWhitespaceASCII(alternate_protocol_str, base::TRIM_ALL,
  94                               &alternate_protocol_str);
  95     if (!alternate_protocol_str.empty()) {
  96       alternate_protocol_values.push_back(alternate_protocol_str);
  97     }
  98   }
  99
 100   session->http_stream_factory()->ProcessAlternateProtocol(
 101       session->http_server_properties(),
 102       alternate_protocol_values,
 103       http_host_port_pair,
 104       *session);
 105 }
 106
 107 scoped_ptr<base::Value> NetLogSSLVersionFallbackCallback(
 108     const GURL* url,
 109     int net_error,
 110     SSLFailureState ssl_failure_state,
 111     uint16 version_before,
 112     uint16 version_after,
 113     NetLogCaptureMode /* capture_mode */) {
 114   scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
 115   dict->SetString("host_and_port", GetHostAndPort(*url));
 116   dict->SetInteger("net_error", net_error);
 117   dict->SetInteger("ssl_failure_state", ssl_failure_state);
 118   dict->SetInteger("version_before", version_before);
 119   dict->SetInteger("version_after", version_after);
 120   return dict.Pass();
 121 }
 122
 123 scoped_ptr<base::Value> NetLogSSLCipherFallbackCallback(
 124     const GURL* url,
 125     int net_error,
 126     NetLogCaptureMode /* capture_mode */) {
 127   scoped_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
 128   dict->SetString("host_and_port", GetHostAndPort(*url));
 129   dict->SetInteger("net_error", net_error);
 130   return dict.Pass();
 131 }
 132
 133 }  // namespace
 134
 135 //-----------------------------------------------------------------------------
 136
 137 HttpNetworkTransaction::HttpNetworkTransaction(RequestPriority priority,
 138                                                HttpNetworkSession* session)
 139     : pending_auth_target_(HttpAuth::AUTH_NONE),
 140       io_callback_(base::Bind(&HttpNetworkTransaction::OnIOComplete,
 141                               base::Unretained(this))),
 142       session_(session),
 143       request_(NULL),
 144       priority_(priority),
 145       headers_valid_(false),
 146       server_ssl_failure_state_(SSL_FAILURE_NONE),
 147       fallback_error_code_(ERR_SSL_INAPPROPRIATE_FALLBACK),
 148       fallback_failure_state_(SSL_FAILURE_NONE),
 149       request_headers_(),
 150       read_buf_len_(0),
 151       total_received_bytes_(0),
 152       next_state_(STATE_NONE),
 153       establishing_tunnel_(false),
 154       websocket_handshake_stream_base_create_helper_(NULL) {
 155   session->ssl_config_service()->GetSSLConfig(&server_ssl_config_);
 156   session->GetNextProtos(&server_ssl_config_.next_protos);
 157   proxy_ssl_config_ = server_ssl_config_;
 158 }
 159
 160 HttpNetworkTransaction::~HttpNetworkTransaction() {
 161   if (stream_.get()) {
 162     HttpResponseHeaders* headers = GetResponseHeaders();
 163     // TODO(mbelshe): The stream_ should be able to compute whether or not the
 164     //                stream should be kept alive.  No reason to compute here
 165     //                and pass it in.
 166     bool try_to_keep_alive =
 167         next_state_ == STATE_NONE &&
 168         stream_->CanFindEndOfResponse() &&
 169         (!headers || headers->IsKeepAlive());
 170     if (!try_to_keep_alive) {
 171       stream_->Close(true /* not reusable */);
 172     } else {
 173       if (stream_->IsResponseBodyComplete()) {
 174         // If the response body is complete, we can just reuse the socket.
 175         stream_->Close(false /* reusable */);
 176       } else if (stream_->IsSpdyHttpStream()) {
 177         // Doesn't really matter for SpdyHttpStream. Just close it.
 178         stream_->Close(true /* not reusable */);
 179       } else {
 180         // Otherwise, we try to drain the response body.
 181         HttpStream* stream = stream_.release();
 182         stream->Drain(session_);
 183       }
 184     }
 185   }
 186
 187   if (request_ && request_->upload_data_stream)
 188     request_->upload_data_stream->Reset();  // Invalidate pending callbacks.
 189 }
 190
 191 int HttpNetworkTransaction::Start(const HttpRequestInfo* request_info,
 192                                   const CompletionCallback& callback,
 193                                   const BoundNetLog& net_log) {
 194   net_log_ = net_log;
 195   request_ = request_info;
 196
 197   if (request_->load_flags & LOAD_DISABLE_CERT_REVOCATION_CHECKING) {
 198     server_ssl_config_.rev_checking_enabled = false;
 199     proxy_ssl_config_.rev_checking_enabled = false;
 200   }
 201
 202   if (request_->load_flags & LOAD_PREFETCH)
 203     response_.unused_since_prefetch = true;
 204
 205   // Channel ID is disabled if privacy mode is enabled for this request.
 206   if (request_->privacy_mode == PRIVACY_MODE_ENABLED)
 207     server_ssl_config_.channel_id_enabled = false;
 208
 209   next_state_ = STATE_NOTIFY_BEFORE_CREATE_STREAM;
 210   int rv = DoLoop(OK);
 211   if (rv == ERR_IO_PENDING)
 212     callback_ = callback;
 213   return rv;
 214 }
 215
 216 int HttpNetworkTransaction::RestartIgnoringLastError(
 217     const CompletionCallback& callback) {
 218   DCHECK(!stream_.get());
 219   DCHECK(!stream_request_.get());
 220   DCHECK_EQ(STATE_NONE, next_state_);
 221
 222   next_state_ = STATE_CREATE_STREAM;
 223
 224   int rv = DoLoop(OK);
 225   if (rv == ERR_IO_PENDING)
 226     callback_ = callback;
 227   return rv;
 228 }
 229
 230 int HttpNetworkTransaction::RestartWithCertificate(
 231     X509Certificate* client_cert, const CompletionCallback& callback) {
 232   // In HandleCertificateRequest(), we always tear down existing stream
 233   // requests to force a new connection.  So we shouldn't have one here.
 234   DCHECK(!stream_request_.get());
 235   DCHECK(!stream_.get());
 236   DCHECK_EQ(STATE_NONE, next_state_);
 237
 238   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
 239       &proxy_ssl_config_ : &server_ssl_config_;
 240   ssl_config->send_client_cert = true;
 241   ssl_config->client_cert = client_cert;
 242   session_->ssl_client_auth_cache()->Add(
 243       response_.cert_request_info->host_and_port, client_cert);
 244   // Reset the other member variables.
 245   // Note: this is necessary only with SSL renegotiation.
 246   ResetStateForRestart();
 247   next_state_ = STATE_CREATE_STREAM;
 248   int rv = DoLoop(OK);
 249   if (rv == ERR_IO_PENDING)
 250     callback_ = callback;
 251   return rv;
 252 }
 253
 254 int HttpNetworkTransaction::RestartWithAuth(
 255     const AuthCredentials& credentials, const CompletionCallback& callback) {
 256   HttpAuth::Target target = pending_auth_target_;
 257   if (target == HttpAuth::AUTH_NONE) {
 258     NOTREACHED();
 259     return ERR_UNEXPECTED;
 260   }
 261   pending_auth_target_ = HttpAuth::AUTH_NONE;
 262
 263   auth_controllers_[target]->ResetAuth(credentials);
 264
 265   DCHECK(callback_.is_null());
 266
 267   int rv = OK;
 268   if (target == HttpAuth::AUTH_PROXY && establishing_tunnel_) {
 269     // In this case, we've gathered credentials for use with proxy
 270     // authentication of a tunnel.
 271     DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 272     DCHECK(stream_request_ != NULL);
 273     auth_controllers_[target] = NULL;
 274     ResetStateForRestart();
 275     rv = stream_request_->RestartTunnelWithProxyAuth(credentials);
 276   } else {
 277     // In this case, we've gathered credentials for the server or the proxy
 278     // but it is not during the tunneling phase.
 279     DCHECK(stream_request_ == NULL);
 280     PrepareForAuthRestart(target);
 281     rv = DoLoop(OK);
 282   }
 283
 284   if (rv == ERR_IO_PENDING)
 285     callback_ = callback;
 286   return rv;
 287 }
 288
 289 void HttpNetworkTransaction::PrepareForAuthRestart(HttpAuth::Target target) {
 290   DCHECK(HaveAuth(target));
 291   DCHECK(!stream_request_.get());
 292
 293   bool keep_alive = false;
 294   // Even if the server says the connection is keep-alive, we have to be
 295   // able to find the end of each response in order to reuse the connection.
 296   if (GetResponseHeaders()->IsKeepAlive() &&
 297       stream_->CanFindEndOfResponse()) {
 298     // If the response body hasn't been completely read, we need to drain
 299     // it first.
 300     if (!stream_->IsResponseBodyComplete()) {
 301       next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
 302       read_buf_ = new IOBuffer(kDrainBodyBufferSize);  // A bit bucket.
 303       read_buf_len_ = kDrainBodyBufferSize;
 304       return;
 305     }
 306     keep_alive = true;
 307   }
 308
 309   // We don't need to drain the response body, so we act as if we had drained
 310   // the response body.
 311   DidDrainBodyForAuthRestart(keep_alive);
 312 }
 313
 314 void HttpNetworkTransaction::DidDrainBodyForAuthRestart(bool keep_alive) {
 315   DCHECK(!stream_request_.get());
 316
 317   if (stream_.get()) {
 318     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 319     HttpStream* new_stream = NULL;
 320     if (keep_alive && stream_->IsConnectionReusable()) {
 321       // We should call connection_->set_idle_time(), but this doesn't occur
 322       // often enough to be worth the trouble.
 323       stream_->SetConnectionReused();
 324       new_stream = stream_->RenewStreamForAuth();
 325     }
 326
 327     if (!new_stream) {
 328       // Close the stream and mark it as not_reusable.  Even in the
 329       // keep_alive case, we've determined that the stream_ is not
 330       // reusable if new_stream is NULL.
 331       stream_->Close(true);
 332       next_state_ = STATE_CREATE_STREAM;
 333     } else {
 334       // Renewed streams shouldn't carry over received bytes.
 335       DCHECK_EQ(0, new_stream->GetTotalReceivedBytes());
 336       next_state_ = STATE_INIT_STREAM;
 337     }
 338     stream_.reset(new_stream);
 339   }
 340
 341   // Reset the other member variables.
 342   ResetStateForAuthRestart();
 343 }
 344
 345 bool HttpNetworkTransaction::IsReadyToRestartForAuth() {
 346   return pending_auth_target_ != HttpAuth::AUTH_NONE &&
 347       HaveAuth(pending_auth_target_);
 348 }
 349
 350 int HttpNetworkTransaction::Read(IOBuffer* buf, int buf_len,
 351                                  const CompletionCallback& callback) {
 352   DCHECK(buf);
 353   DCHECK_LT(0, buf_len);
 354
 355   State next_state = STATE_NONE;
 356
 357   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
 358   if (headers_valid_ && headers.get() && stream_request_.get()) {
 359     // We're trying to read the body of the response but we're still trying
 360     // to establish an SSL tunnel through an HTTP proxy.  We can't read these
 361     // bytes when establishing a tunnel because they might be controlled by
 362     // an active network attacker.  We don't worry about this for HTTP
 363     // because an active network attacker can already control HTTP sessions.
 364     // We reach this case when the user cancels a 407 proxy auth prompt.  We
 365     // also don't worry about this for an HTTPS Proxy, because the
 366     // communication with the proxy is secure.
 367     // See http://crbug.com/8473.
 368     DCHECK(proxy_info_.is_http() || proxy_info_.is_https());
 369     DCHECK_EQ(headers->response_code(), HTTP_PROXY_AUTHENTICATION_REQUIRED);
 370     LOG(WARNING) << "Blocked proxy response with status "
 371                  << headers->response_code() << " to CONNECT request for "
 372                  << GetHostAndPort(request_->url) << ".";
 373     return ERR_TUNNEL_CONNECTION_FAILED;
 374   }
 375
 376   // Are we using SPDY or HTTP?
 377   next_state = STATE_READ_BODY;
 378
 379   read_buf_ = buf;
 380   read_buf_len_ = buf_len;
 381
 382   next_state_ = next_state;
 383   int rv = DoLoop(OK);
 384   if (rv == ERR_IO_PENDING)
 385     callback_ = callback;
 386   return rv;
 387 }
 388
 389 void HttpNetworkTransaction::StopCaching() {}
 390
 391 bool HttpNetworkTransaction::GetFullRequestHeaders(
 392     HttpRequestHeaders* headers) const {
 393   // TODO(ttuttle): Make sure we've populated request_headers_.
 394   *headers = request_headers_;
 395   return true;
 396 }
 397
 398 int64 HttpNetworkTransaction::GetTotalReceivedBytes() const {
 399   int64 total_received_bytes = total_received_bytes_;
 400   if (stream_)
 401     total_received_bytes += stream_->GetTotalReceivedBytes();
 402   return total_received_bytes;
 403 }
 404
 405 void HttpNetworkTransaction::DoneReading() {}
 406
 407 const HttpResponseInfo* HttpNetworkTransaction::GetResponseInfo() const {
 408   return &response_;
 409 }
 410
 411 LoadState HttpNetworkTransaction::GetLoadState() const {
 412   // TODO(wtc): Define a new LoadState value for the
 413   // STATE_INIT_CONNECTION_COMPLETE state, which delays the HTTP request.
 414   switch (next_state_) {
 415     case STATE_CREATE_STREAM:
 416       return LOAD_STATE_WAITING_FOR_DELEGATE;
 417     case STATE_CREATE_STREAM_COMPLETE:
 418       return stream_request_->GetLoadState();
 419     case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 420     case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 421     case STATE_SEND_REQUEST_COMPLETE:
 422       return LOAD_STATE_SENDING_REQUEST;
 423     case STATE_READ_HEADERS_COMPLETE:
 424       return LOAD_STATE_WAITING_FOR_RESPONSE;
 425     case STATE_READ_BODY_COMPLETE:
 426       return LOAD_STATE_READING_RESPONSE;
 427     default:
 428       return LOAD_STATE_IDLE;
 429   }
 430 }
 431
 432 UploadProgress HttpNetworkTransaction::GetUploadProgress() const {
 433   if (!stream_.get())
 434     return UploadProgress();
 435
 436   return stream_->GetUploadProgress();
 437 }
 438
 439 void HttpNetworkTransaction::SetQuicServerInfo(
 440     QuicServerInfo* quic_server_info) {}
 441
 442 bool HttpNetworkTransaction::GetLoadTimingInfo(
 443     LoadTimingInfo* load_timing_info) const {
 444   if (!stream_ || !stream_->GetLoadTimingInfo(load_timing_info))
 445     return false;
 446
 447   load_timing_info->proxy_resolve_start =
 448       proxy_info_.proxy_resolve_start_time();
 449   load_timing_info->proxy_resolve_end = proxy_info_.proxy_resolve_end_time();
 450   load_timing_info->send_start = send_start_time_;
 451   load_timing_info->send_end = send_end_time_;
 452   return true;
 453 }
 454
 455 void HttpNetworkTransaction::SetPriority(RequestPriority priority) {
 456   priority_ = priority;
 457   if (stream_request_)
 458     stream_request_->SetPriority(priority);
 459   if (stream_)
 460     stream_->SetPriority(priority);
 461 }
 462
 463 void HttpNetworkTransaction::SetWebSocketHandshakeStreamCreateHelper(
 464     WebSocketHandshakeStreamBase::CreateHelper* create_helper) {
 465   websocket_handshake_stream_base_create_helper_ = create_helper;
 466 }
 467
 468 void HttpNetworkTransaction::SetBeforeNetworkStartCallback(
 469     const BeforeNetworkStartCallback& callback) {
 470   before_network_start_callback_ = callback;
 471 }
 472
 473 void HttpNetworkTransaction::SetBeforeProxyHeadersSentCallback(
 474     const BeforeProxyHeadersSentCallback& callback) {
 475   before_proxy_headers_sent_callback_ = callback;
 476 }
 477
 478 int HttpNetworkTransaction::ResumeNetworkStart() {
 479   DCHECK_EQ(next_state_, STATE_CREATE_STREAM);
 480   return DoLoop(OK);
 481 }
 482
 483 void HttpNetworkTransaction::OnStreamReady(const SSLConfig& used_ssl_config,
 484                                            const ProxyInfo& used_proxy_info,
 485                                            HttpStream* stream) {
 486   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 487   DCHECK(stream_request_.get());
 488
 489   if (stream_)
 490     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 491   stream_.reset(stream);
 492   server_ssl_config_ = used_ssl_config;
 493   proxy_info_ = used_proxy_info;
 494   response_.was_npn_negotiated = stream_request_->was_npn_negotiated();
 495   response_.npn_negotiated_protocol = SSLClientSocket::NextProtoToString(
 496       stream_request_->protocol_negotiated());
 497   response_.was_fetched_via_spdy = stream_request_->using_spdy();
 498   response_.was_fetched_via_proxy = !proxy_info_.is_direct();
 499   if (response_.was_fetched_via_proxy && !proxy_info_.is_empty())
 500     response_.proxy_server = proxy_info_.proxy_server().host_port_pair();
 501   OnIOComplete(OK);
 502 }
 503
 504 void HttpNetworkTransaction::OnWebSocketHandshakeStreamReady(
 505     const SSLConfig& used_ssl_config,
 506     const ProxyInfo& used_proxy_info,
 507     WebSocketHandshakeStreamBase* stream) {
 508   OnStreamReady(used_ssl_config, used_proxy_info, stream);
 509 }
 510
 511 void HttpNetworkTransaction::OnStreamFailed(int result,
 512                                             const SSLConfig& used_ssl_config,
 513                                             SSLFailureState ssl_failure_state) {
 514   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 515   DCHECK_NE(OK, result);
 516   DCHECK(stream_request_.get());
 517   DCHECK(!stream_.get());
 518   server_ssl_config_ = used_ssl_config;
 519   server_ssl_failure_state_ = ssl_failure_state;
 520
 521   OnIOComplete(result);
 522 }
 523
 524 void HttpNetworkTransaction::OnCertificateError(
 525     int result,
 526     const SSLConfig& used_ssl_config,
 527     const SSLInfo& ssl_info) {
 528   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 529   DCHECK_NE(OK, result);
 530   DCHECK(stream_request_.get());
 531   DCHECK(!stream_.get());
 532
 533   response_.ssl_info = ssl_info;
 534   server_ssl_config_ = used_ssl_config;
 535
 536   // TODO(mbelshe):  For now, we're going to pass the error through, and that
 537   // will close the stream_request in all cases.  This means that we're always
 538   // going to restart an entire STATE_CREATE_STREAM, even if the connection is
 539   // good and the user chooses to ignore the error.  This is not ideal, but not
 540   // the end of the world either.
 541
 542   OnIOComplete(result);
 543 }
 544
 545 void HttpNetworkTransaction::OnNeedsProxyAuth(
 546     const HttpResponseInfo& proxy_response,
 547     const SSLConfig& used_ssl_config,
 548     const ProxyInfo& used_proxy_info,
 549     HttpAuthController* auth_controller) {
 550   DCHECK(stream_request_.get());
 551   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 552
 553   establishing_tunnel_ = true;
 554   response_.headers = proxy_response.headers;
 555   response_.auth_challenge = proxy_response.auth_challenge;
 556   headers_valid_ = true;
 557   server_ssl_config_ = used_ssl_config;
 558   proxy_info_ = used_proxy_info;
 559
 560   auth_controllers_[HttpAuth::AUTH_PROXY] = auth_controller;
 561   pending_auth_target_ = HttpAuth::AUTH_PROXY;
 562
 563   DoCallback(OK);
 564 }
 565
 566 void HttpNetworkTransaction::OnNeedsClientAuth(
 567     const SSLConfig& used_ssl_config,
 568     SSLCertRequestInfo* cert_info) {
 569   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 570
 571   server_ssl_config_ = used_ssl_config;
 572   response_.cert_request_info = cert_info;
 573   OnIOComplete(ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
 574 }
 575
 576 void HttpNetworkTransaction::OnHttpsProxyTunnelResponse(
 577     const HttpResponseInfo& response_info,
 578     const SSLConfig& used_ssl_config,
 579     const ProxyInfo& used_proxy_info,
 580     HttpStream* stream) {
 581   DCHECK_EQ(STATE_CREATE_STREAM_COMPLETE, next_state_);
 582
 583   CopyConnectionAttemptsFromStreamRequest();
 584
 585   headers_valid_ = true;
 586   response_ = response_info;
 587   server_ssl_config_ = used_ssl_config;
 588   proxy_info_ = used_proxy_info;
 589   if (stream_)
 590     total_received_bytes_ += stream_->GetTotalReceivedBytes();
 591   stream_.reset(stream);
 592   stream_request_.reset();  // we're done with the stream request
 593   OnIOComplete(ERR_HTTPS_PROXY_TUNNEL_RESPONSE);
 594 }
 595
 596 void HttpNetworkTransaction::GetConnectionAttempts(
 597     ConnectionAttempts* out) const {
 598   *out = connection_attempts_;
 599 }
 600
 601 bool HttpNetworkTransaction::IsSecureRequest() const {
 602   return request_->url.SchemeIsCryptographic();
 603 }
 604
 605 bool HttpNetworkTransaction::UsingHttpProxyWithoutTunnel() const {
 606   return (proxy_info_.is_http() || proxy_info_.is_https() ||
 607           proxy_info_.is_quic()) &&
 608          !(request_->url.SchemeIs("https") || request_->url.SchemeIsWSOrWSS());
 609 }
 610
 611 void HttpNetworkTransaction::DoCallback(int rv) {
 612   DCHECK_NE(rv, ERR_IO_PENDING);
 613   DCHECK(!callback_.is_null());
 614
 615   // Since Run may result in Read being called, clear user_callback_ up front.
 616   CompletionCallback c = callback_;
 617   callback_.Reset();
 618   c.Run(rv);
 619 }
 620
 621 void HttpNetworkTransaction::OnIOComplete(int result) {
 622   int rv = DoLoop(result);
 623   if (rv != ERR_IO_PENDING)
 624     DoCallback(rv);
 625 }
 626
 627 int HttpNetworkTransaction::DoLoop(int result) {
 628   DCHECK(next_state_ != STATE_NONE);
 629
 630   int rv = result;
 631   do {
 632     State state = next_state_;
 633     next_state_ = STATE_NONE;
 634     switch (state) {
 635       case STATE_NOTIFY_BEFORE_CREATE_STREAM:
 636         DCHECK_EQ(OK, rv);
 637         rv = DoNotifyBeforeCreateStream();
 638         break;
 639       case STATE_CREATE_STREAM:
 640         DCHECK_EQ(OK, rv);
 641         rv = DoCreateStream();
 642         break;
 643       case STATE_CREATE_STREAM_COMPLETE:
 644         rv = DoCreateStreamComplete(rv);
 645         break;
 646       case STATE_INIT_STREAM:
 647         DCHECK_EQ(OK, rv);
 648         rv = DoInitStream();
 649         break;
 650       case STATE_INIT_STREAM_COMPLETE:
 651         rv = DoInitStreamComplete(rv);
 652         break;
 653       case STATE_GENERATE_PROXY_AUTH_TOKEN:
 654         DCHECK_EQ(OK, rv);
 655         rv = DoGenerateProxyAuthToken();
 656         break;
 657       case STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE:
 658         rv = DoGenerateProxyAuthTokenComplete(rv);
 659         break;
 660       case STATE_GENERATE_SERVER_AUTH_TOKEN:
 661         DCHECK_EQ(OK, rv);
 662         rv = DoGenerateServerAuthToken();
 663         break;
 664       case STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE:
 665         rv = DoGenerateServerAuthTokenComplete(rv);
 666         break;
 667       case STATE_INIT_REQUEST_BODY:
 668         DCHECK_EQ(OK, rv);
 669         rv = DoInitRequestBody();
 670         break;
 671       case STATE_INIT_REQUEST_BODY_COMPLETE:
 672         rv = DoInitRequestBodyComplete(rv);
 673         break;
 674       case STATE_BUILD_REQUEST:
 675         DCHECK_EQ(OK, rv);
 676         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST);
 677         rv = DoBuildRequest();
 678         break;
 679       case STATE_BUILD_REQUEST_COMPLETE:
 680         rv = DoBuildRequestComplete(rv);
 681         break;
 682       case STATE_SEND_REQUEST:
 683         DCHECK_EQ(OK, rv);
 684         rv = DoSendRequest();
 685         break;
 686       case STATE_SEND_REQUEST_COMPLETE:
 687         rv = DoSendRequestComplete(rv);
 688         net_log_.EndEventWithNetErrorCode(
 689             NetLog::TYPE_HTTP_TRANSACTION_SEND_REQUEST, rv);
 690         break;
 691       case STATE_READ_HEADERS:
 692         DCHECK_EQ(OK, rv);
 693         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS);
 694         rv = DoReadHeaders();
 695         break;
 696       case STATE_READ_HEADERS_COMPLETE:
 697         rv = DoReadHeadersComplete(rv);
 698         net_log_.EndEventWithNetErrorCode(
 699             NetLog::TYPE_HTTP_TRANSACTION_READ_HEADERS, rv);
 700         break;
 701       case STATE_READ_BODY:
 702         DCHECK_EQ(OK, rv);
 703         net_log_.BeginEvent(NetLog::TYPE_HTTP_TRANSACTION_READ_BODY);
 704         rv = DoReadBody();
 705         break;
 706       case STATE_READ_BODY_COMPLETE:
 707         rv = DoReadBodyComplete(rv);
 708         net_log_.EndEventWithNetErrorCode(
 709             NetLog::TYPE_HTTP_TRANSACTION_READ_BODY, rv);
 710         break;
 711       case STATE_DRAIN_BODY_FOR_AUTH_RESTART:
 712         DCHECK_EQ(OK, rv);
 713         net_log_.BeginEvent(
 714             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART);
 715         rv = DoDrainBodyForAuthRestart();
 716         break;
 717       case STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE:
 718         rv = DoDrainBodyForAuthRestartComplete(rv);
 719         net_log_.EndEventWithNetErrorCode(
 720             NetLog::TYPE_HTTP_TRANSACTION_DRAIN_BODY_FOR_AUTH_RESTART, rv);
 721         break;
 722       default:
 723         NOTREACHED() << "bad state";
 724         rv = ERR_FAILED;
 725         break;
 726     }
 727   } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
 728
 729   return rv;
 730 }
 731
 732 int HttpNetworkTransaction::DoNotifyBeforeCreateStream() {
 733   next_state_ = STATE_CREATE_STREAM;
 734   bool defer = false;
 735   if (!before_network_start_callback_.is_null())
 736     before_network_start_callback_.Run(&defer);
 737   if (!defer)
 738     return OK;
 739   return ERR_IO_PENDING;
 740 }
 741
 742 int HttpNetworkTransaction::DoCreateStream() {
 743   // TODO(mmenke): Remove ScopedTracker below once crbug.com/424359 is fixed.
 744   tracked_objects::ScopedTracker tracking_profile(
 745       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 746           "424359 HttpNetworkTransaction::DoCreateStream"));
 747
 748   response_.network_accessed = true;
 749
 750   next_state_ = STATE_CREATE_STREAM_COMPLETE;
 751   if (ForWebSocketHandshake()) {
 752     stream_request_.reset(
 753         session_->http_stream_factory_for_websocket()
 754             ->RequestWebSocketHandshakeStream(
 755                   *request_,
 756                   priority_,
 757                   server_ssl_config_,
 758                   proxy_ssl_config_,
 759                   this,
 760                   websocket_handshake_stream_base_create_helper_,
 761                   net_log_));
 762   } else {
 763     stream_request_.reset(
 764         session_->http_stream_factory()->RequestStream(
 765             *request_,
 766             priority_,
 767             server_ssl_config_,
 768             proxy_ssl_config_,
 769             this,
 770             net_log_));
 771   }
 772   DCHECK(stream_request_.get());
 773   return ERR_IO_PENDING;
 774 }
 775
 776 int HttpNetworkTransaction::DoCreateStreamComplete(int result) {
 777   // If |result| is ERR_HTTPS_PROXY_TUNNEL_RESPONSE, then
 778   // DoCreateStreamComplete is being called from OnHttpsProxyTunnelResponse,
 779   // which resets the stream request first. Therefore, we have to grab the
 780   // connection attempts in *that* function instead of here in that case.
 781   if (result != ERR_HTTPS_PROXY_TUNNEL_RESPONSE)
 782     CopyConnectionAttemptsFromStreamRequest();
 783
 784   if (request_->url.SchemeIsCryptographic())
 785     RecordSSLFallbackMetrics(result);
 786
 787   if (result == OK) {
 788     next_state_ = STATE_INIT_STREAM;
 789     DCHECK(stream_.get());
 790   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 791     result = HandleCertificateRequest(result);
 792   } else if (result == ERR_HTTPS_PROXY_TUNNEL_RESPONSE) {
 793     // Return OK and let the caller read the proxy's error page
 794     next_state_ = STATE_NONE;
 795     return OK;
 796   } else if (result == ERR_HTTP_1_1_REQUIRED ||
 797              result == ERR_PROXY_HTTP_1_1_REQUIRED) {
 798     return HandleHttp11Required(result);
 799   }
 800
 801   // Handle possible handshake errors that may have occurred if the stream
 802   // used SSL for one or more of the layers.
 803   result = HandleSSLHandshakeError(result);
 804
 805   // At this point we are done with the stream_request_.
 806   stream_request_.reset();
 807   return result;
 808 }
 809
 810 int HttpNetworkTransaction::DoInitStream() {
 811   DCHECK(stream_.get());
 812   next_state_ = STATE_INIT_STREAM_COMPLETE;
 813   return stream_->InitializeStream(request_, priority_, net_log_, io_callback_);
 814 }
 815
 816 int HttpNetworkTransaction::DoInitStreamComplete(int result) {
 817   if (result == OK) {
 818     next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN;
 819   } else {
 820     if (result < 0)
 821       result = HandleIOError(result);
 822
 823     // The stream initialization failed, so this stream will never be useful.
 824     if (stream_)
 825         total_received_bytes_ += stream_->GetTotalReceivedBytes();
 826     stream_.reset();
 827   }
 828
 829   return result;
 830 }
 831
 832 int HttpNetworkTransaction::DoGenerateProxyAuthToken() {
 833   next_state_ = STATE_GENERATE_PROXY_AUTH_TOKEN_COMPLETE;
 834   if (!ShouldApplyProxyAuth())
 835     return OK;
 836   HttpAuth::Target target = HttpAuth::AUTH_PROXY;
 837   if (!auth_controllers_[target].get())
 838     auth_controllers_[target] =
 839         new HttpAuthController(target,
 840                                AuthURL(target),
 841                                session_->http_auth_cache(),
 842                                session_->http_auth_handler_factory());
 843   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 844                                                            io_callback_,
 845                                                            net_log_);
 846 }
 847
 848 int HttpNetworkTransaction::DoGenerateProxyAuthTokenComplete(int rv) {
 849   DCHECK_NE(ERR_IO_PENDING, rv);
 850   if (rv == OK)
 851     next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN;
 852   return rv;
 853 }
 854
 855 int HttpNetworkTransaction::DoGenerateServerAuthToken() {
 856   next_state_ = STATE_GENERATE_SERVER_AUTH_TOKEN_COMPLETE;
 857   HttpAuth::Target target = HttpAuth::AUTH_SERVER;
 858   if (!auth_controllers_[target].get()) {
 859     auth_controllers_[target] =
 860         new HttpAuthController(target,
 861                                AuthURL(target),
 862                                session_->http_auth_cache(),
 863                                session_->http_auth_handler_factory());
 864     if (request_->load_flags & LOAD_DO_NOT_USE_EMBEDDED_IDENTITY)
 865       auth_controllers_[target]->DisableEmbeddedIdentity();
 866   }
 867   if (!ShouldApplyServerAuth())
 868     return OK;
 869   return auth_controllers_[target]->MaybeGenerateAuthToken(request_,
 870                                                            io_callback_,
 871                                                            net_log_);
 872 }
 873
 874 int HttpNetworkTransaction::DoGenerateServerAuthTokenComplete(int rv) {
 875   DCHECK_NE(ERR_IO_PENDING, rv);
 876   if (rv == OK)
 877     next_state_ = STATE_INIT_REQUEST_BODY;
 878   return rv;
 879 }
 880
 881 void HttpNetworkTransaction::BuildRequestHeaders(
 882     bool using_http_proxy_without_tunnel) {
 883   request_headers_.SetHeader(HttpRequestHeaders::kHost,
 884                              GetHostAndOptionalPort(request_->url));
 885
 886   // For compat with HTTP/1.0 servers and proxies:
 887   if (using_http_proxy_without_tunnel) {
 888     request_headers_.SetHeader(HttpRequestHeaders::kProxyConnection,
 889                                "keep-alive");
 890   } else {
 891     request_headers_.SetHeader(HttpRequestHeaders::kConnection, "keep-alive");
 892   }
 893
 894   // Add a content length header?
 895   if (request_->upload_data_stream) {
 896     if (request_->upload_data_stream->is_chunked()) {
 897       request_headers_.SetHeader(
 898           HttpRequestHeaders::kTransferEncoding, "chunked");
 899     } else {
 900       request_headers_.SetHeader(
 901           HttpRequestHeaders::kContentLength,
 902           base::Uint64ToString(request_->upload_data_stream->size()));
 903     }
 904   } else if (request_->method == "POST" || request_->method == "PUT") {
 905     // An empty POST/PUT request still needs a content length.  As for HEAD,
 906     // IE and Safari also add a content length header.  Presumably it is to
 907     // support sending a HEAD request to an URL that only expects to be sent a
 908     // POST or some other method that normally would have a message body.
 909     // Firefox (40.0) does not send the header, and RFC 7230 & 7231
 910     // specify that it should not be sent due to undefined behavior.
 911     request_headers_.SetHeader(HttpRequestHeaders::kContentLength, "0");
 912   }
 913
 914   // Honor load flags that impact proxy caches.
 915   if (request_->load_flags & LOAD_BYPASS_CACHE) {
 916     request_headers_.SetHeader(HttpRequestHeaders::kPragma, "no-cache");
 917     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "no-cache");
 918   } else if (request_->load_flags & LOAD_VALIDATE_CACHE) {
 919     request_headers_.SetHeader(HttpRequestHeaders::kCacheControl, "max-age=0");
 920   }
 921
 922   if (ShouldApplyProxyAuth() && HaveAuth(HttpAuth::AUTH_PROXY))
 923     auth_controllers_[HttpAuth::AUTH_PROXY]->AddAuthorizationHeader(
 924         &request_headers_);
 925   if (ShouldApplyServerAuth() && HaveAuth(HttpAuth::AUTH_SERVER))
 926     auth_controllers_[HttpAuth::AUTH_SERVER]->AddAuthorizationHeader(
 927         &request_headers_);
 928
 929   request_headers_.MergeFrom(request_->extra_headers);
 930
 931   if (using_http_proxy_without_tunnel &&
 932       !before_proxy_headers_sent_callback_.is_null())
 933     before_proxy_headers_sent_callback_.Run(proxy_info_, &request_headers_);
 934
 935   response_.did_use_http_auth =
 936       request_headers_.HasHeader(HttpRequestHeaders::kAuthorization) ||
 937       request_headers_.HasHeader(HttpRequestHeaders::kProxyAuthorization);
 938 }
 939
 940 int HttpNetworkTransaction::DoInitRequestBody() {
 941   next_state_ = STATE_INIT_REQUEST_BODY_COMPLETE;
 942   int rv = OK;
 943   if (request_->upload_data_stream)
 944     rv = request_->upload_data_stream->Init(io_callback_);
 945   return rv;
 946 }
 947
 948 int HttpNetworkTransaction::DoInitRequestBodyComplete(int result) {
 949   if (result == OK)
 950     next_state_ = STATE_BUILD_REQUEST;
 951   return result;
 952 }
 953
 954 int HttpNetworkTransaction::DoBuildRequest() {
 955   next_state_ = STATE_BUILD_REQUEST_COMPLETE;
 956   headers_valid_ = false;
 957
 958   // This is constructed lazily (instead of within our Start method), so that
 959   // we have proxy info available.
 960   if (request_headers_.IsEmpty()) {
 961     bool using_http_proxy_without_tunnel = UsingHttpProxyWithoutTunnel();
 962     BuildRequestHeaders(using_http_proxy_without_tunnel);
 963   }
 964
 965   return OK;
 966 }
 967
 968 int HttpNetworkTransaction::DoBuildRequestComplete(int result) {
 969   if (result == OK)
 970     next_state_ = STATE_SEND_REQUEST;
 971   return result;
 972 }
 973
 974 int HttpNetworkTransaction::DoSendRequest() {
 975   // TODO(mmenke): Remove ScopedTracker below once crbug.com/424359 is fixed.
 976   tracked_objects::ScopedTracker tracking_profile(
 977       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 978           "424359 HttpNetworkTransaction::DoSendRequest"));
 979
 980   send_start_time_ = base::TimeTicks::Now();
 981   next_state_ = STATE_SEND_REQUEST_COMPLETE;
 982
 983   return stream_->SendRequest(request_headers_, &response_, io_callback_);
 984 }
 985
 986 int HttpNetworkTransaction::DoSendRequestComplete(int result) {
 987   send_end_time_ = base::TimeTicks::Now();
 988   if (result < 0)
 989     return HandleIOError(result);
 990   next_state_ = STATE_READ_HEADERS;
 991   return OK;
 992 }
 993
 994 int HttpNetworkTransaction::DoReadHeaders() {
 995   next_state_ = STATE_READ_HEADERS_COMPLETE;
 996   return stream_->ReadResponseHeaders(io_callback_);
 997 }
 998
 999 int HttpNetworkTransaction::DoReadHeadersComplete(int result) {
1000   // We can get a certificate error or ERR_SSL_CLIENT_AUTH_CERT_NEEDED here
1001   // due to SSL renegotiation.
1002   if (IsCertificateError(result)) {
1003     // We don't handle a certificate error during SSL renegotiation, so we
1004     // have to return an error that's not in the certificate error range
1005     // (-2xx).
1006     LOG(ERROR) << "Got a server certificate with error " << result
1007                << " during SSL renegotiation";
1008     result = ERR_CERT_ERROR_IN_SSL_RENEGOTIATION;
1009   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
1010     // TODO(wtc): Need a test case for this code path!
1011     DCHECK(stream_.get());
1012     DCHECK(IsSecureRequest());
1013     response_.cert_request_info = new SSLCertRequestInfo;
1014     stream_->GetSSLCertRequestInfo(response_.cert_request_info.get());
1015     result = HandleCertificateRequest(result);
1016     if (result == OK)
1017       return result;
1018   }
1019
1020   if (result == ERR_HTTP_1_1_REQUIRED ||
1021       result == ERR_PROXY_HTTP_1_1_REQUIRED) {
1022     return HandleHttp11Required(result);
1023   }
1024
1025   // ERR_CONNECTION_CLOSED is treated differently at this point; if partial
1026   // response headers were received, we do the best we can to make sense of it
1027   // and send it back up the stack.
1028   //
1029   // TODO(davidben): Consider moving this to HttpBasicStream, It's a little
1030   // bizarre for SPDY. Assuming this logic is useful at all.
1031   // TODO(davidben): Bubble the error code up so we do not cache?
1032   if (result == ERR_CONNECTION_CLOSED && response_.headers.get())
1033     result = OK;
1034
1035   if (result < 0)
1036     return HandleIOError(result);
1037
1038   DCHECK(response_.headers.get());
1039
1040   // On a 408 response from the server ("Request Timeout") on a stale socket,
1041   // retry the request.
1042   // Headers can be NULL because of http://crbug.com/384554.
1043   if (response_.headers.get() && response_.headers->response_code() == 408 &&
1044       stream_->IsConnectionReused()) {
1045     net_log_.AddEventWithNetErrorCode(
1046         NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR,
1047         response_.headers->response_code());
1048     // This will close the socket - it would be weird to try and reuse it, even
1049     // if the server doesn't actually close it.
1050     ResetConnectionAndRequestForResend();
1051     return OK;
1052   }
1053
1054   // Like Net.HttpResponseCode, but only for MAIN_FRAME loads.
1055   if (request_->load_flags & LOAD_MAIN_FRAME) {
1056     const int response_code = response_.headers->response_code();
1057     UMA_HISTOGRAM_ENUMERATION(
1058         "Net.HttpResponseCode_Nxx_MainFrame", response_code/100, 10);
1059   }
1060
1061   net_log_.AddEvent(
1062       NetLog::TYPE_HTTP_TRANSACTION_READ_RESPONSE_HEADERS,
1063       base::Bind(&HttpResponseHeaders::NetLogCallback, response_.headers));
1064
1065   if (response_.headers->GetParsedHttpVersion() < HttpVersion(1, 0)) {
1066     // HTTP/0.9 doesn't support the PUT method, so lack of response headers
1067     // indicates a buggy server.  See:
1068     // https://bugzilla.mozilla.org/show_bug.cgi?id=193921
1069     if (request_->method == "PUT")
1070       return ERR_METHOD_NOT_SUPPORTED;
1071   }
1072
1073   // Check for an intermediate 100 Continue response.  An origin server is
1074   // allowed to send this response even if we didn't ask for it, so we just
1075   // need to skip over it.
1076   // We treat any other 1xx in this same way (although in practice getting
1077   // a 1xx that isn't a 100 is rare).
1078   // Unless this is a WebSocket request, in which case we pass it on up.
1079   if (response_.headers->response_code() / 100 == 1 &&
1080       !ForWebSocketHandshake()) {
1081     response_.headers = new HttpResponseHeaders(std::string());
1082     next_state_ = STATE_READ_HEADERS;
1083     return OK;
1084   }
1085
1086   ProcessAlternativeServices(session_, *response_.headers.get(),
1087                              HostPortPair::FromURL(request_->url));
1088
1089   int rv = HandleAuthChallenge();
1090   if (rv != OK)
1091     return rv;
1092
1093   if (IsSecureRequest())
1094     stream_->GetSSLInfo(&response_.ssl_info);
1095
1096   headers_valid_ = true;
1097   return OK;
1098 }
1099
1100 int HttpNetworkTransaction::DoReadBody() {
1101   DCHECK(read_buf_.get());
1102   DCHECK_GT(read_buf_len_, 0);
1103   DCHECK(stream_ != NULL);
1104
1105   next_state_ = STATE_READ_BODY_COMPLETE;
1106   return stream_->ReadResponseBody(
1107       read_buf_.get(), read_buf_len_, io_callback_);
1108 }
1109
1110 int HttpNetworkTransaction::DoReadBodyComplete(int result) {
1111   // We are done with the Read call.
1112   bool done = false;
1113   if (result <= 0) {
1114     DCHECK_NE(ERR_IO_PENDING, result);
1115     done = true;
1116   }
1117
1118   bool keep_alive = false;
1119   if (stream_->IsResponseBodyComplete()) {
1120     // Note: Just because IsResponseBodyComplete is true, we're not
1121     // necessarily "done".  We're only "done" when it is the last
1122     // read on this HttpNetworkTransaction, which will be signified
1123     // by a zero-length read.
1124     // TODO(mbelshe): The keepalive property is really a property of
1125     //    the stream.  No need to compute it here just to pass back
1126     //    to the stream's Close function.
1127     // TODO(rtenneti): CanFindEndOfResponse should return false if there are no
1128     // ResponseHeaders.
1129     if (stream_->CanFindEndOfResponse()) {
1130       HttpResponseHeaders* headers = GetResponseHeaders();
1131       if (headers)
1132         keep_alive = headers->IsKeepAlive();
1133     }
1134   }
1135
1136   // Clean up connection if we are done.
1137   if (done) {
1138     stream_->Close(!keep_alive);
1139     // Note: we don't reset the stream here.  We've closed it, but we still
1140     // need it around so that callers can call methods such as
1141     // GetUploadProgress() and have them be meaningful.
1142     // TODO(mbelshe): This means we closed the stream here, and we close it
1143     // again in ~HttpNetworkTransaction.  Clean that up.
1144
1145     // The next Read call will return 0 (EOF).
1146   }
1147
1148   // Clear these to avoid leaving around old state.
1149   read_buf_ = NULL;
1150   read_buf_len_ = 0;
1151
1152   return result;
1153 }
1154
1155 int HttpNetworkTransaction::DoDrainBodyForAuthRestart() {
1156   // This method differs from DoReadBody only in the next_state_.  So we just
1157   // call DoReadBody and override the next_state_.  Perhaps there is a more
1158   // elegant way for these two methods to share code.
1159   int rv = DoReadBody();
1160   DCHECK(next_state_ == STATE_READ_BODY_COMPLETE);
1161   next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE;
1162   return rv;
1163 }
1164
1165 // TODO(wtc): This method and the DoReadBodyComplete method are almost
1166 // the same.  Figure out a good way for these two methods to share code.
1167 int HttpNetworkTransaction::DoDrainBodyForAuthRestartComplete(int result) {
1168   // keep_alive defaults to true because the very reason we're draining the
1169   // response body is to reuse the connection for auth restart.
1170   bool done = false, keep_alive = true;
1171   if (result < 0) {
1172     // Error or closed connection while reading the socket.
1173     done = true;
1174     keep_alive = false;
1175   } else if (stream_->IsResponseBodyComplete()) {
1176     done = true;
1177   }
1178
1179   if (done) {
1180     DidDrainBodyForAuthRestart(keep_alive);
1181   } else {
1182     // Keep draining.
1183     next_state_ = STATE_DRAIN_BODY_FOR_AUTH_RESTART;
1184   }
1185
1186   return OK;
1187 }
1188
1189 int HttpNetworkTransaction::HandleCertificateRequest(int error) {
1190   // There are two paths through which the server can request a certificate
1191   // from us.  The first is during the initial handshake, the second is
1192   // during SSL renegotiation.
1193   //
1194   // In both cases, we want to close the connection before proceeding.
1195   // We do this for two reasons:
1196   //   First, we don't want to keep the connection to the server hung for a
1197   //   long time while the user selects a certificate.
1198   //   Second, even if we did keep the connection open, NSS has a bug where
1199   //   restarting the handshake for ClientAuth is currently broken.
1200   DCHECK_EQ(error, ERR_SSL_CLIENT_AUTH_CERT_NEEDED);
1201
1202   if (stream_.get()) {
1203     // Since we already have a stream, we're being called as part of SSL
1204     // renegotiation.
1205     DCHECK(!stream_request_.get());
1206     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1207     stream_->Close(true);
1208     stream_.reset();
1209   }
1210
1211   // The server is asking for a client certificate during the initial
1212   // handshake.
1213   stream_request_.reset();
1214
1215   // If the user selected one of the certificates in client_certs or declined
1216   // to provide one for this server before, use the past decision
1217   // automatically.
1218   scoped_refptr<X509Certificate> client_cert;
1219   bool found_cached_cert = session_->ssl_client_auth_cache()->Lookup(
1220       response_.cert_request_info->host_and_port, &client_cert);
1221   if (!found_cached_cert)
1222     return error;
1223
1224   // Check that the certificate selected is still a certificate the server
1225   // is likely to accept, based on the criteria supplied in the
1226   // CertificateRequest message.
1227   if (client_cert.get()) {
1228     const std::vector<std::string>& cert_authorities =
1229         response_.cert_request_info->cert_authorities;
1230
1231     bool cert_still_valid = cert_authorities.empty() ||
1232         client_cert->IsIssuedByEncoded(cert_authorities);
1233     if (!cert_still_valid)
1234       return error;
1235   }
1236
1237   // TODO(davidben): Add a unit test which covers this path; we need to be
1238   // able to send a legitimate certificate and also bypass/clear the
1239   // SSL session cache.
1240   SSLConfig* ssl_config = response_.cert_request_info->is_proxy ?
1241       &proxy_ssl_config_ : &server_ssl_config_;
1242   ssl_config->send_client_cert = true;
1243   ssl_config->client_cert = client_cert;
1244   next_state_ = STATE_CREATE_STREAM;
1245   // Reset the other member variables.
1246   // Note: this is necessary only with SSL renegotiation.
1247   ResetStateForRestart();
1248   return OK;
1249 }
1250
1251 int HttpNetworkTransaction::HandleHttp11Required(int error) {
1252   DCHECK(error == ERR_HTTP_1_1_REQUIRED ||
1253          error == ERR_PROXY_HTTP_1_1_REQUIRED);
1254
1255   if (error == ERR_HTTP_1_1_REQUIRED) {
1256     HttpServerProperties::ForceHTTP11(&server_ssl_config_);
1257   } else {
1258     HttpServerProperties::ForceHTTP11(&proxy_ssl_config_);
1259   }
1260   ResetConnectionAndRequestForResend();
1261   return OK;
1262 }
1263
1264 void HttpNetworkTransaction::HandleClientAuthError(int error) {
1265   if (server_ssl_config_.send_client_cert &&
1266       (error == ERR_SSL_PROTOCOL_ERROR || IsClientCertificateError(error))) {
1267     session_->ssl_client_auth_cache()->Remove(
1268         HostPortPair::FromURL(request_->url));
1269   }
1270 }
1271
1272 // TODO(rch): This does not correctly handle errors when an SSL proxy is
1273 // being used, as all of the errors are handled as if they were generated
1274 // by the endpoint host, request_->url, rather than considering if they were
1275 // generated by the SSL proxy. http://crbug.com/69329
1276 int HttpNetworkTransaction::HandleSSLHandshakeError(int error) {
1277   DCHECK(request_);
1278   HandleClientAuthError(error);
1279
1280   // Accept deprecated cipher suites, but only on a fallback. This makes UMA
1281   // reflect servers require a deprecated cipher rather than merely prefer
1282   // it. This, however, has no security benefit until the ciphers are actually
1283   // removed.
1284   if (!server_ssl_config_.enable_deprecated_cipher_suites &&
1285       (error == ERR_SSL_VERSION_OR_CIPHER_MISMATCH ||
1286        error == ERR_CONNECTION_CLOSED || error == ERR_CONNECTION_RESET)) {
1287     net_log_.AddEvent(
1288         NetLog::TYPE_SSL_CIPHER_FALLBACK,
1289         base::Bind(&NetLogSSLCipherFallbackCallback, &request_->url, error));
1290     server_ssl_config_.enable_deprecated_cipher_suites = true;
1291     ResetConnectionAndRequestForResend();
1292     return OK;
1293   }
1294
1295   bool should_fallback = false;
1296   uint16 version_max = server_ssl_config_.version_max;
1297
1298   switch (error) {
1299     case ERR_CONNECTION_CLOSED:
1300     case ERR_SSL_PROTOCOL_ERROR:
1301     case ERR_SSL_VERSION_OR_CIPHER_MISMATCH:
1302       if (version_max >= SSL_PROTOCOL_VERSION_TLS1 &&
1303           version_max > server_ssl_config_.version_min) {
1304         // This could be a TLS-intolerant server or a server that chose a
1305         // cipher suite defined only for higher protocol versions (such as
1306         // an SSL 3.0 server that chose a TLS-only cipher suite).  Fall
1307         // back to the next lower version and retry.
1308         // NOTE: if the SSLClientSocket class doesn't support TLS 1.1,
1309         // specifying TLS 1.1 in version_max will result in a TLS 1.0
1310         // handshake, so falling back from TLS 1.1 to TLS 1.0 will simply
1311         // repeat the TLS 1.0 handshake. To avoid this problem, the default
1312         // version_max should match the maximum protocol version supported
1313         // by the SSLClientSocket class.
1314         version_max--;
1315
1316         // Fallback to the lower SSL version.
1317         // While SSL 3.0 fallback should be eliminated because of security
1318         // reasons, there is a high risk of breaking the servers if this is
1319         // done in general.
1320         should_fallback = true;
1321       }
1322       break;
1323     case ERR_CONNECTION_RESET:
1324       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1325           version_max > server_ssl_config_.version_min) {
1326         // Some network devices that inspect application-layer packets seem to
1327         // inject TCP reset packets to break the connections when they see TLS
1328         // 1.1 in ClientHello or ServerHello. See http://crbug.com/130293.
1329         //
1330         // Only allow ERR_CONNECTION_RESET to trigger a fallback from TLS 1.1 or
1331         // 1.2. We don't lose much in this fallback because the explicit IV for
1332         // CBC mode in TLS 1.1 is approximated by record splitting in TLS
1333         // 1.0. The fallback will be more painful for TLS 1.2 when we have GCM
1334         // support.
1335         //
1336         // ERR_CONNECTION_RESET is a common network error, so we don't want it
1337         // to trigger a version fallback in general, especially the TLS 1.0 ->
1338         // SSL 3.0 fallback, which would drop TLS extensions.
1339         version_max--;
1340         should_fallback = true;
1341       }
1342       break;
1343     case ERR_SSL_BAD_RECORD_MAC_ALERT:
1344       if (version_max >= SSL_PROTOCOL_VERSION_TLS1_1 &&
1345           version_max > server_ssl_config_.version_min) {
1346         // Some broken SSL devices negotiate TLS 1.0 when sent a TLS 1.1 or
1347         // 1.2 ClientHello, but then return a bad_record_mac alert. See
1348         // crbug.com/260358. In order to make the fallback as minimal as
1349         // possible, this fallback is only triggered for >= TLS 1.1.
1350         version_max--;
1351         should_fallback = true;
1352       }
1353       break;
1354     case ERR_SSL_INAPPROPRIATE_FALLBACK:
1355       // The server told us that we should not have fallen back. A buggy server
1356       // could trigger ERR_SSL_INAPPROPRIATE_FALLBACK with the initial
1357       // connection. |fallback_error_code_| is initialised to
1358       // ERR_SSL_INAPPROPRIATE_FALLBACK to catch this case.
1359       error = fallback_error_code_;
1360       break;
1361   }
1362
1363   if (should_fallback) {
1364     net_log_.AddEvent(
1365         NetLog::TYPE_SSL_VERSION_FALLBACK,
1366         base::Bind(&NetLogSSLVersionFallbackCallback, &request_->url, error,
1367                    server_ssl_failure_state_, server_ssl_config_.version_max,
1368                    version_max));
1369     fallback_error_code_ = error;
1370     fallback_failure_state_ = server_ssl_failure_state_;
1371     server_ssl_config_.version_max = version_max;
1372     server_ssl_config_.version_fallback = true;
1373     ResetConnectionAndRequestForResend();
1374     error = OK;
1375   }
1376
1377   return error;
1378 }
1379
1380 // This method determines whether it is safe to resend the request after an
1381 // IO error.  It can only be called in response to request header or body
1382 // write errors or response header read errors.  It should not be used in
1383 // other cases, such as a Connect error.
1384 int HttpNetworkTransaction::HandleIOError(int error) {
1385   // Because the peer may request renegotiation with client authentication at
1386   // any time, check and handle client authentication errors.
1387   HandleClientAuthError(error);
1388
1389   switch (error) {
1390     // If we try to reuse a connection that the server is in the process of
1391     // closing, we may end up successfully writing out our request (or a
1392     // portion of our request) only to find a connection error when we try to
1393     // read from (or finish writing to) the socket.
1394     case ERR_CONNECTION_RESET:
1395     case ERR_CONNECTION_CLOSED:
1396     case ERR_CONNECTION_ABORTED:
1397     // There can be a race between the socket pool checking checking whether a
1398     // socket is still connected, receiving the FIN, and sending/reading data
1399     // on a reused socket.  If we receive the FIN between the connectedness
1400     // check and writing/reading from the socket, we may first learn the socket
1401     // is disconnected when we get a ERR_SOCKET_NOT_CONNECTED.  This will most
1402     // likely happen when trying to retrieve its IP address.
1403     // See http://crbug.com/105824 for more details.
1404     case ERR_SOCKET_NOT_CONNECTED:
1405     // If a socket is closed on its initial request, HttpStreamParser returns
1406     // ERR_EMPTY_RESPONSE. This may still be close/reuse race if the socket was
1407     // preconnected but failed to be used before the server timed it out.
1408     case ERR_EMPTY_RESPONSE:
1409       if (ShouldResendRequest()) {
1410         net_log_.AddEventWithNetErrorCode(
1411             NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1412         ResetConnectionAndRequestForResend();
1413         error = OK;
1414       }
1415       break;
1416     case ERR_SPDY_PING_FAILED:
1417     case ERR_SPDY_SERVER_REFUSED_STREAM:
1418     case ERR_QUIC_HANDSHAKE_FAILED:
1419       net_log_.AddEventWithNetErrorCode(
1420           NetLog::TYPE_HTTP_TRANSACTION_RESTART_AFTER_ERROR, error);
1421       ResetConnectionAndRequestForResend();
1422       error = OK;
1423       break;
1424   }
1425   return error;
1426 }
1427
1428 void HttpNetworkTransaction::ResetStateForRestart() {
1429   ResetStateForAuthRestart();
1430   if (stream_)
1431     total_received_bytes_ += stream_->GetTotalReceivedBytes();
1432   stream_.reset();
1433 }
1434
1435 void HttpNetworkTransaction::ResetStateForAuthRestart() {
1436   send_start_time_ = base::TimeTicks();
1437   send_end_time_ = base::TimeTicks();
1438
1439   pending_auth_target_ = HttpAuth::AUTH_NONE;
1440   read_buf_ = NULL;
1441   read_buf_len_ = 0;
1442   headers_valid_ = false;
1443   request_headers_.Clear();
1444   response_ = HttpResponseInfo();
1445   establishing_tunnel_ = false;
1446 }
1447
1448 void HttpNetworkTransaction::RecordSSLFallbackMetrics(int result) {
1449   if (result != OK && result != ERR_SSL_INAPPROPRIATE_FALLBACK)
1450     return;
1451
1452   const std::string& host = request_->url.host();
1453   bool is_google = base::EndsWith(host, "google.com",
1454                                   base::CompareCase::SENSITIVE) &&
1455                    (host.size() == 10 || host[host.size() - 11] == '.');
1456   if (is_google) {
1457     // Some fraction of successful connections use the fallback, but only due to
1458     // a spurious network failure. To estimate this fraction, compare handshakes
1459     // to Google servers which succeed against those that fail with an
1460     // inappropriate_fallback alert. Google servers are known to implement
1461     // FALLBACK_SCSV, so a spurious network failure while connecting would
1462     // trigger the fallback, successfully connect, but fail with this alert.
1463     UMA_HISTOGRAM_BOOLEAN("Net.GoogleConnectionInappropriateFallback",
1464                           result == ERR_SSL_INAPPROPRIATE_FALLBACK);
1465   }
1466
1467   if (result != OK)
1468     return;
1469
1470   // Note: these values are used in histograms, so new values must be appended.
1471   enum FallbackVersion {
1472     FALLBACK_NONE = 0,  // SSL version fallback did not occur.
1473     // Obsolete: FALLBACK_SSL3 = 1,
1474     FALLBACK_TLS1 = 2,    // Fell back to TLS 1.0.
1475     FALLBACK_TLS1_1 = 3,  // Fell back to TLS 1.1.
1476     FALLBACK_MAX,
1477   };
1478
1479   FallbackVersion fallback = FALLBACK_NONE;
1480   if (server_ssl_config_.version_fallback) {
1481     switch (server_ssl_config_.version_max) {
1482       case SSL_PROTOCOL_VERSION_TLS1:
1483         fallback = FALLBACK_TLS1;
1484         break;
1485       case SSL_PROTOCOL_VERSION_TLS1_1:
1486         fallback = FALLBACK_TLS1_1;
1487         break;
1488       default:
1489         NOTREACHED();
1490     }
1491   }
1492   UMA_HISTOGRAM_ENUMERATION("Net.ConnectionUsedSSLVersionFallback2", fallback,
1493                             FALLBACK_MAX);
1494
1495   // Google servers are known to implement TLS 1.2 and FALLBACK_SCSV, so it
1496   // should be impossible to successfully connect to them with the fallback.
1497   // This helps estimate intolerant locally-configured SSL MITMs.
1498   if (is_google) {
1499     UMA_HISTOGRAM_ENUMERATION("Net.GoogleConnectionUsedSSLVersionFallback2",
1500                               fallback, FALLBACK_MAX);
1501   }
1502
1503   UMA_HISTOGRAM_BOOLEAN("Net.ConnectionUsedSSLDeprecatedCipherFallback2",
1504                         server_ssl_config_.enable_deprecated_cipher_suites);
1505
1506   if (server_ssl_config_.version_fallback) {
1507     // Record the error code which triggered the fallback and the state the
1508     // handshake was in.
1509     UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSLFallbackErrorCode",
1510                                 -fallback_error_code_);
1511     UMA_HISTOGRAM_ENUMERATION("Net.SSLFallbackFailureState",
1512                               fallback_failure_state_, SSL_FAILURE_MAX);
1513   }
1514 }
1515
1516 HttpResponseHeaders* HttpNetworkTransaction::GetResponseHeaders() const {
1517   return response_.headers.get();
1518 }
1519
1520 bool HttpNetworkTransaction::ShouldResendRequest() const {
1521   bool connection_is_proven = stream_->IsConnectionReused();
1522   bool has_received_headers = GetResponseHeaders() != NULL;
1523
1524   // NOTE: we resend a request only if we reused a keep-alive connection.
1525   // This automatically prevents an infinite resend loop because we'll run
1526   // out of the cached keep-alive connections eventually.
1527   if (connection_is_proven && !has_received_headers)
1528     return true;
1529   return false;
1530 }
1531
1532 void HttpNetworkTransaction::ResetConnectionAndRequestForResend() {
1533   if (stream_.get()) {
1534     stream_->Close(true);
1535     stream_.reset();
1536   }
1537
1538   // We need to clear request_headers_ because it contains the real request
1539   // headers, but we may need to resend the CONNECT request first to recreate
1540   // the SSL tunnel.
1541   request_headers_.Clear();
1542   next_state_ = STATE_CREATE_STREAM;  // Resend the request.
1543 }
1544
1545 bool HttpNetworkTransaction::ShouldApplyProxyAuth() const {
1546   return UsingHttpProxyWithoutTunnel();
1547 }
1548
1549 bool HttpNetworkTransaction::ShouldApplyServerAuth() const {
1550   return !(request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA);
1551 }
1552
1553 int HttpNetworkTransaction::HandleAuthChallenge() {
1554   scoped_refptr<HttpResponseHeaders> headers(GetResponseHeaders());
1555   DCHECK(headers.get());
1556
1557   int status = headers->response_code();
1558   if (status != HTTP_UNAUTHORIZED &&
1559       status != HTTP_PROXY_AUTHENTICATION_REQUIRED)
1560     return OK;
1561   HttpAuth::Target target = status == HTTP_PROXY_AUTHENTICATION_REQUIRED ?
1562                             HttpAuth::AUTH_PROXY : HttpAuth::AUTH_SERVER;
1563   if (target == HttpAuth::AUTH_PROXY && proxy_info_.is_direct())
1564     return ERR_UNEXPECTED_PROXY_AUTH;
1565
1566   // This case can trigger when an HTTPS server responds with a "Proxy
1567   // authentication required" status code through a non-authenticating
1568   // proxy.
1569   if (!auth_controllers_[target].get())
1570     return ERR_UNEXPECTED_PROXY_AUTH;
1571
1572   int rv = auth_controllers_[target]->HandleAuthChallenge(
1573       headers, (request_->load_flags & LOAD_DO_NOT_SEND_AUTH_DATA) != 0, false,
1574       net_log_);
1575   if (auth_controllers_[target]->HaveAuthHandler())
1576       pending_auth_target_ = target;
1577
1578   scoped_refptr<AuthChallengeInfo> auth_info =
1579       auth_controllers_[target]->auth_info();
1580   if (auth_info.get())
1581       response_.auth_challenge = auth_info;
1582
1583   return rv;
1584 }
1585
1586 bool HttpNetworkTransaction::HaveAuth(HttpAuth::Target target) const {
1587   return auth_controllers_[target].get() &&
1588       auth_controllers_[target]->HaveAuth();
1589 }
1590
1591 GURL HttpNetworkTransaction::AuthURL(HttpAuth::Target target) const {
1592   switch (target) {
1593     case HttpAuth::AUTH_PROXY: {
1594       if (!proxy_info_.proxy_server().is_valid() ||
1595           proxy_info_.proxy_server().is_direct()) {
1596         return GURL();  // There is no proxy server.
1597       }
1598       const char* scheme = proxy_info_.is_https() ? "https://" : "http://";
1599       return GURL(scheme +
1600                   proxy_info_.proxy_server().host_port_pair().ToString());
1601     }
1602     case HttpAuth::AUTH_SERVER:
1603       if (ForWebSocketHandshake()) {
1604         const GURL& url = request_->url;
1605         url::Replacements<char> ws_to_http;
1606         if (url.SchemeIs("ws")) {
1607           ws_to_http.SetScheme("http", url::Component(0, 4));
1608         } else {
1609           DCHECK(url.SchemeIs("wss"));
1610           ws_to_http.SetScheme("https", url::Component(0, 5));
1611         }
1612         return url.ReplaceComponents(ws_to_http);
1613       }
1614       return request_->url;
1615     default:
1616      return GURL();
1617   }
1618 }
1619
1620 bool HttpNetworkTransaction::ForWebSocketHandshake() const {
1621   return websocket_handshake_stream_base_create_helper_ &&
1622          request_->url.SchemeIsWSOrWSS();
1623 }
1624
1625 #define STATE_CASE(s) \
1626   case s: \
1627     description = base::StringPrintf("%s (0x%08X)", #s, s); \
1628     break
1629
1630 std::string HttpNetworkTransaction::DescribeState(State state) {
1631   std::string description;
1632   switch (state) {
1633     STATE_CASE(STATE_NOTIFY_BEFORE_CREATE_STREAM);
1634     STATE_CASE(STATE_CREATE_STREAM);
1635     STATE_CASE(STATE_CREATE_STREAM_COMPLETE);
1636     STATE_CASE(STATE_INIT_REQUEST_BODY);
1637     STATE_CASE(STATE_INIT_REQUEST_BODY_COMPLETE);
1638     STATE_CASE(STATE_BUILD_REQUEST);
1639     STATE_CASE(STATE_BUILD_REQUEST_COMPLETE);
1640     STATE_CASE(STATE_SEND_REQUEST);
1641     STATE_CASE(STATE_SEND_REQUEST_COMPLETE);
1642     STATE_CASE(STATE_READ_HEADERS);
1643     STATE_CASE(STATE_READ_HEADERS_COMPLETE);
1644     STATE_CASE(STATE_READ_BODY);
1645     STATE_CASE(STATE_READ_BODY_COMPLETE);
1646     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART);
1647     STATE_CASE(STATE_DRAIN_BODY_FOR_AUTH_RESTART_COMPLETE);
1648     STATE_CASE(STATE_NONE);
1649     default:
1650       description = base::StringPrintf("Unknown state 0x%08X (%u)", state,
1651                                        state);
1652       break;
1653   }
1654   return description;
1655 }
1656
1657 #undef STATE_CASE
1658
1659 void HttpNetworkTransaction::CopyConnectionAttemptsFromStreamRequest() {
1660   DCHECK(stream_request_);
1661
1662   // Since the transaction can restart with auth credentials, it may create a
1663   // stream more than once. Accumulate all of the connection attempts across
1664   // those streams by appending them to the vector:
1665   for (const auto& attempt : stream_request_->connection_attempts())
1666     connection_attempts_.push_back(attempt);
1667 }
1668
1669 }  // namespace net