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