net/url_request/url_request_http_job.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/url_request/url_request_http_job.h"
   6
   7 #include "base/base_switches.h"
   8 #include "base/bind.h"
   9 #include "base/bind_helpers.h"
  10 #include "base/command_line.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/file_version_info.h"
  13 #include "base/message_loop/message_loop.h"
  14 #include "base/metrics/field_trial.h"
  15 #include "base/metrics/histogram.h"
  16 #include "base/profiler/scoped_tracker.h"
  17 #include "base/rand_util.h"
  18 #include "base/strings/string_util.h"
  19 #include "base/time/time.h"
  20 #include "net/base/host_port_pair.h"
  21 #include "net/base/load_flags.h"
  22 #include "net/base/net_errors.h"
  23 #include "net/base/net_util.h"
  24 #include "net/base/network_delegate.h"
  25 #include "net/base/sdch_manager.h"
  26 #include "net/base/sdch_net_log_params.h"
  27 #include "net/cert/cert_status_flags.h"
  28 #include "net/cookies/cookie_store.h"
  29 #include "net/http/http_content_disposition.h"
  30 #include "net/http/http_network_session.h"
  31 #include "net/http/http_request_headers.h"
  32 #include "net/http/http_response_headers.h"
  33 #include "net/http/http_response_info.h"
  34 #include "net/http/http_status_code.h"
  35 #include "net/http/http_transaction.h"
  36 #include "net/http/http_transaction_factory.h"
  37 #include "net/http/http_util.h"
  38 #include "net/proxy/proxy_info.h"
  39 #include "net/ssl/ssl_cert_request_info.h"
  40 #include "net/ssl/ssl_config_service.h"
  41 #include "net/url_request/fraudulent_certificate_reporter.h"
  42 #include "net/url_request/http_user_agent_settings.h"
  43 #include "net/url_request/url_request.h"
  44 #include "net/url_request/url_request_context.h"
  45 #include "net/url_request/url_request_error_job.h"
  46 #include "net/url_request/url_request_job_factory.h"
  47 #include "net/url_request/url_request_redirect_job.h"
  48 #include "net/url_request/url_request_throttler_header_adapter.h"
  49 #include "net/url_request/url_request_throttler_manager.h"
  50 #include "net/websockets/websocket_handshake_stream_base.h"
  51
  52 static const char kAvailDictionaryHeader[] = "Avail-Dictionary";
  53
  54 namespace net {
  55
  56 class URLRequestHttpJob::HttpFilterContext : public FilterContext {
  57  public:
  58   explicit HttpFilterContext(URLRequestHttpJob* job);
  59   ~HttpFilterContext() override;
  60
  61   // FilterContext implementation.
  62   bool GetMimeType(std::string* mime_type) const override;
  63   bool GetURL(GURL* gurl) const override;
  64   base::Time GetRequestTime() const override;
  65   bool IsCachedContent() const override;
  66   SdchManager::DictionarySet* SdchDictionariesAdvertised() const override;
  67   int64 GetByteReadCount() const override;
  68   int GetResponseCode() const override;
  69   const URLRequestContext* GetURLRequestContext() const override;
  70   void RecordPacketStats(StatisticSelector statistic) const override;
  71   const BoundNetLog& GetNetLog() const override;
  72
  73  private:
  74   URLRequestHttpJob* job_;
  75
  76   // URLRequestHttpJob may be detached from URLRequest, but we still need to
  77   // return something.
  78   BoundNetLog dummy_log_;
  79
  80   DISALLOW_COPY_AND_ASSIGN(HttpFilterContext);
  81 };
  82
  83 URLRequestHttpJob::HttpFilterContext::HttpFilterContext(URLRequestHttpJob* job)
  84     : job_(job) {
  85   DCHECK(job_);
  86 }
  87
  88 URLRequestHttpJob::HttpFilterContext::~HttpFilterContext() {
  89 }
  90
  91 bool URLRequestHttpJob::HttpFilterContext::GetMimeType(
  92     std::string* mime_type) const {
  93   return job_->GetMimeType(mime_type);
  94 }
  95
  96 bool URLRequestHttpJob::HttpFilterContext::GetURL(GURL* gurl) const {
  97   if (!job_->request())
  98     return false;
  99   *gurl = job_->request()->url();
 100   return true;
 101 }
 102
 103 base::Time URLRequestHttpJob::HttpFilterContext::GetRequestTime() const {
 104   return job_->request() ? job_->request()->request_time() : base::Time();
 105 }
 106
 107 bool URLRequestHttpJob::HttpFilterContext::IsCachedContent() const {
 108   return job_->is_cached_content_;
 109 }
 110
 111 SdchManager::DictionarySet*
 112 URLRequestHttpJob::HttpFilterContext::SdchDictionariesAdvertised() const {
 113   return job_->dictionaries_advertised_.get();
 114 }
 115
 116 int64 URLRequestHttpJob::HttpFilterContext::GetByteReadCount() const {
 117   return job_->prefilter_bytes_read();
 118 }
 119
 120 int URLRequestHttpJob::HttpFilterContext::GetResponseCode() const {
 121   return job_->GetResponseCode();
 122 }
 123
 124 const URLRequestContext*
 125 URLRequestHttpJob::HttpFilterContext::GetURLRequestContext() const {
 126   return job_->request() ? job_->request()->context() : NULL;
 127 }
 128
 129 void URLRequestHttpJob::HttpFilterContext::RecordPacketStats(
 130     StatisticSelector statistic) const {
 131   job_->RecordPacketStats(statistic);
 132 }
 133
 134 const BoundNetLog& URLRequestHttpJob::HttpFilterContext::GetNetLog() const {
 135   return job_->request() ? job_->request()->net_log() : dummy_log_;
 136 }
 137
 138 // TODO(darin): make sure the port blocking code is not lost
 139 // static
 140 URLRequestJob* URLRequestHttpJob::Factory(URLRequest* request,
 141                                           NetworkDelegate* network_delegate,
 142                                           const std::string& scheme) {
 143   DCHECK(scheme == "http" || scheme == "https" || scheme == "ws" ||
 144          scheme == "wss");
 145
 146   if (!request->context()->http_transaction_factory()) {
 147     NOTREACHED() << "requires a valid context";
 148     return new URLRequestErrorJob(
 149         request, network_delegate, ERR_INVALID_ARGUMENT);
 150   }
 151
 152   GURL redirect_url;
 153   if (request->GetHSTSRedirect(&redirect_url)) {
 154     return new URLRequestRedirectJob(
 155         request, network_delegate, redirect_url,
 156         // Use status code 307 to preserve the method, so POST requests work.
 157         URLRequestRedirectJob::REDIRECT_307_TEMPORARY_REDIRECT, "HSTS");
 158   }
 159   return new URLRequestHttpJob(request,
 160                                network_delegate,
 161                                request->context()->http_user_agent_settings());
 162 }
 163
 164 URLRequestHttpJob::URLRequestHttpJob(
 165     URLRequest* request,
 166     NetworkDelegate* network_delegate,
 167     const HttpUserAgentSettings* http_user_agent_settings)
 168     : URLRequestJob(request, network_delegate),
 169       priority_(DEFAULT_PRIORITY),
 170       response_info_(NULL),
 171       response_cookies_save_index_(0),
 172       proxy_auth_state_(AUTH_STATE_DONT_NEED_AUTH),
 173       server_auth_state_(AUTH_STATE_DONT_NEED_AUTH),
 174       start_callback_(base::Bind(&URLRequestHttpJob::OnStartCompleted,
 175                                  base::Unretained(this))),
 176       notify_before_headers_sent_callback_(
 177           base::Bind(&URLRequestHttpJob::NotifyBeforeSendHeadersCallback,
 178                      base::Unretained(this))),
 179       read_in_progress_(false),
 180       throttling_entry_(NULL),
 181       sdch_test_activated_(false),
 182       sdch_test_control_(false),
 183       is_cached_content_(false),
 184       request_creation_time_(),
 185       packet_timing_enabled_(false),
 186       done_(false),
 187       bytes_observed_in_packets_(0),
 188       request_time_snapshot_(),
 189       final_packet_time_(),
 190       filter_context_(new HttpFilterContext(this)),
 191       on_headers_received_callback_(
 192           base::Bind(&URLRequestHttpJob::OnHeadersReceivedCallback,
 193                      base::Unretained(this))),
 194       awaiting_callback_(false),
 195       http_user_agent_settings_(http_user_agent_settings),
 196       weak_factory_(this) {
 197   URLRequestThrottlerManager* manager = request->context()->throttler_manager();
 198   if (manager)
 199     throttling_entry_ = manager->RegisterRequestUrl(request->url());
 200
 201   ResetTimer();
 202 }
 203
 204 URLRequestHttpJob::~URLRequestHttpJob() {
 205   CHECK(!awaiting_callback_);
 206
 207   DCHECK(!sdch_test_control_ || !sdch_test_activated_);
 208   if (!is_cached_content_) {
 209     if (sdch_test_control_)
 210       RecordPacketStats(FilterContext::SDCH_EXPERIMENT_HOLDBACK);
 211     if (sdch_test_activated_)
 212       RecordPacketStats(FilterContext::SDCH_EXPERIMENT_DECODE);
 213   }
 214   // Make sure SDCH filters are told to emit histogram data while
 215   // filter_context_ is still alive.
 216   DestroyFilters();
 217
 218   DoneWithRequest(ABORTED);
 219 }
 220
 221 void URLRequestHttpJob::SetPriority(RequestPriority priority) {
 222   priority_ = priority;
 223   if (transaction_)
 224     transaction_->SetPriority(priority_);
 225 }
 226
 227 void URLRequestHttpJob::Start() {
 228   // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
 229   tracked_objects::ScopedTracker tracking_profile(
 230       FROM_HERE_WITH_EXPLICIT_FUNCTION("456327 URLRequestHttpJob::Start"));
 231
 232   DCHECK(!transaction_.get());
 233
 234   // URLRequest::SetReferrer ensures that we do not send username and password
 235   // fields in the referrer.
 236   GURL referrer(request_->referrer());
 237
 238   request_info_.url = request_->url();
 239   request_info_.method = request_->method();
 240   request_info_.load_flags = request_->load_flags();
 241   // Enable privacy mode if cookie settings or flags tell us not send or
 242   // save cookies.
 243   bool enable_privacy_mode =
 244       (request_info_.load_flags & LOAD_DO_NOT_SEND_COOKIES) ||
 245       (request_info_.load_flags & LOAD_DO_NOT_SAVE_COOKIES) ||
 246       CanEnablePrivacyMode();
 247   // Privacy mode could still be disabled in OnCookiesLoaded if we are going
 248   // to send previously saved cookies.
 249   request_info_.privacy_mode = enable_privacy_mode ?
 250       PRIVACY_MODE_ENABLED : PRIVACY_MODE_DISABLED;
 251
 252   // Strip Referer from request_info_.extra_headers to prevent, e.g., plugins
 253   // from overriding headers that are controlled using other means. Otherwise a
 254   // plugin could set a referrer although sending the referrer is inhibited.
 255   request_info_.extra_headers.RemoveHeader(HttpRequestHeaders::kReferer);
 256
 257   // Our consumer should have made sure that this is a safe referrer. See for
 258   // instance WebCore::FrameLoader::HideReferrer.
 259   if (referrer.is_valid()) {
 260     request_info_.extra_headers.SetHeader(HttpRequestHeaders::kReferer,
 261                                           referrer.spec());
 262   }
 263
 264   request_info_.extra_headers.SetHeaderIfMissing(
 265       HttpRequestHeaders::kUserAgent,
 266       http_user_agent_settings_ ?
 267           http_user_agent_settings_->GetUserAgent() : std::string());
 268
 269   AddExtraHeaders();
 270   AddCookieHeaderAndStart();
 271 }
 272
 273 void URLRequestHttpJob::Kill() {
 274   if (!transaction_.get())
 275     return;
 276
 277   weak_factory_.InvalidateWeakPtrs();
 278   DestroyTransaction();
 279   URLRequestJob::Kill();
 280 }
 281
 282 void URLRequestHttpJob::NotifyBeforeSendProxyHeadersCallback(
 283     const ProxyInfo& proxy_info,
 284     HttpRequestHeaders* request_headers) {
 285   DCHECK(request_headers);
 286   DCHECK_NE(URLRequestStatus::CANCELED, GetStatus().status());
 287   if (network_delegate()) {
 288     network_delegate()->NotifyBeforeSendProxyHeaders(
 289         request_,
 290         proxy_info,
 291         request_headers);
 292   }
 293 }
 294
 295 void URLRequestHttpJob::NotifyHeadersComplete() {
 296   DCHECK(!response_info_);
 297
 298   response_info_ = transaction_->GetResponseInfo();
 299
 300   // Save boolean, as we'll need this info at destruction time, and filters may
 301   // also need this info.
 302   is_cached_content_ = response_info_->was_cached;
 303
 304   if (!is_cached_content_ && throttling_entry_.get()) {
 305     URLRequestThrottlerHeaderAdapter response_adapter(GetResponseHeaders());
 306     throttling_entry_->UpdateWithResponse(request_info_.url.host(),
 307                                           &response_adapter);
 308   }
 309
 310   // The ordering of these calls is not important.
 311   ProcessStrictTransportSecurityHeader();
 312   ProcessPublicKeyPinsHeader();
 313
 314   // Handle the server notification of a new SDCH dictionary.
 315   SdchManager* sdch_manager(request()->context()->sdch_manager());
 316   if (sdch_manager) {
 317     SdchProblemCode rv = sdch_manager->IsInSupportedDomain(request()->url());
 318     if (rv != SDCH_OK) {
 319       // If SDCH is just disabled, it is not a real error.
 320       if (rv != SDCH_DISABLED && rv != SDCH_SECURE_SCHEME_NOT_SUPPORTED) {
 321         SdchManager::SdchErrorRecovery(rv);
 322         request()->net_log().AddEvent(
 323             NetLog::TYPE_SDCH_DECODING_ERROR,
 324             base::Bind(&NetLogSdchResourceProblemCallback, rv));
 325       }
 326     } else {
 327       const std::string name = "Get-Dictionary";
 328       std::string url_text;
 329       void* iter = NULL;
 330       // TODO(jar): We need to not fetch dictionaries the first time they are
 331       // seen, but rather wait until we can justify their usefulness.
 332       // For now, we will only fetch the first dictionary, which will at least
 333       // require multiple suggestions before we get additional ones for this
 334       // site. Eventually we should wait until a dictionary is requested
 335       // several times
 336       // before we even download it (so that we don't waste memory or
 337       // bandwidth).
 338       if (GetResponseHeaders()->EnumerateHeader(&iter, name, &url_text)) {
 339         // Resolve suggested URL relative to request url.
 340         GURL sdch_dictionary_url = request_->url().Resolve(url_text);
 341         if (sdch_dictionary_url.is_valid()) {
 342           rv = sdch_manager->OnGetDictionary(request_->url(),
 343                                              sdch_dictionary_url);
 344           if (rv != SDCH_OK) {
 345             SdchManager::SdchErrorRecovery(rv);
 346             request_->net_log().AddEvent(
 347                 NetLog::TYPE_SDCH_DICTIONARY_ERROR,
 348                 base::Bind(&NetLogSdchDictionaryFetchProblemCallback, rv,
 349                            sdch_dictionary_url, false));
 350           }
 351         }
 352       }
 353     }
 354   }
 355
 356   // Handle the server signalling no SDCH encoding.
 357   if (dictionaries_advertised_) {
 358     // We are wary of proxies that discard or damage SDCH encoding. If a server
 359     // explicitly states that this is not SDCH content, then we can correct our
 360     // assumption that this is an SDCH response, and avoid the need to recover
 361     // as though the content is corrupted (when we discover it is not SDCH
 362     // encoded).
 363     std::string sdch_response_status;
 364     void* iter = NULL;
 365     while (GetResponseHeaders()->EnumerateHeader(&iter, "X-Sdch-Encode",
 366                                                  &sdch_response_status)) {
 367       if (sdch_response_status == "0") {
 368         dictionaries_advertised_.reset();
 369         break;
 370       }
 371     }
 372   }
 373
 374   // The HTTP transaction may be restarted several times for the purposes
 375   // of sending authorization information. Each time it restarts, we get
 376   // notified of the headers completion so that we can update the cookie store.
 377   if (transaction_->IsReadyToRestartForAuth()) {
 378     DCHECK(!response_info_->auth_challenge.get());
 379     // TODO(battre): This breaks the webrequest API for
 380     // URLRequestTestHTTP.BasicAuthWithCookies
 381     // where OnBeforeSendHeaders -> OnSendHeaders -> OnBeforeSendHeaders
 382     // occurs.
 383     RestartTransactionWithAuth(AuthCredentials());
 384     return;
 385   }
 386
 387   URLRequestJob::NotifyHeadersComplete();
 388 }
 389
 390 void URLRequestHttpJob::NotifyDone(const URLRequestStatus& status) {
 391   DoneWithRequest(FINISHED);
 392   URLRequestJob::NotifyDone(status);
 393 }
 394
 395 void URLRequestHttpJob::DestroyTransaction() {
 396   DCHECK(transaction_.get());
 397
 398   DoneWithRequest(ABORTED);
 399   transaction_.reset();
 400   response_info_ = NULL;
 401   receive_headers_end_ = base::TimeTicks();
 402 }
 403
 404 void URLRequestHttpJob::StartTransaction() {
 405   // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
 406   tracked_objects::ScopedTracker tracking_profile(
 407       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 408           "456327 URLRequestHttpJob::StartTransaction"));
 409
 410   if (network_delegate()) {
 411     OnCallToDelegate();
 412     int rv = network_delegate()->NotifyBeforeSendHeaders(
 413         request_, notify_before_headers_sent_callback_,
 414         &request_info_.extra_headers);
 415     // If an extension blocks the request, we rely on the callback to
 416     // MaybeStartTransactionInternal().
 417     if (rv == ERR_IO_PENDING)
 418       return;
 419     MaybeStartTransactionInternal(rv);
 420     return;
 421   }
 422   StartTransactionInternal();
 423 }
 424
 425 void URLRequestHttpJob::NotifyBeforeSendHeadersCallback(int result) {
 426   // Check that there are no callbacks to already canceled requests.
 427   DCHECK_NE(URLRequestStatus::CANCELED, GetStatus().status());
 428
 429   MaybeStartTransactionInternal(result);
 430 }
 431
 432 void URLRequestHttpJob::MaybeStartTransactionInternal(int result) {
 433   // TODO(mmenke): Remove ScopedTracker below once crbug.com/456327 is fixed.
 434   tracked_objects::ScopedTracker tracking_profile(
 435       FROM_HERE_WITH_EXPLICIT_FUNCTION(
 436           "456327 URLRequestHttpJob::MaybeStartTransactionInternal"));
 437
 438   OnCallToDelegateComplete();
 439   if (result == OK) {
 440     StartTransactionInternal();
 441   } else {
 442     std::string source("delegate");
 443     request_->net_log().AddEvent(NetLog::TYPE_CANCELLED,
 444                                  NetLog::StringCallback("source", &source));
 445     NotifyCanceled();
 446     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
 447   }
 448 }
 449
 450 void URLRequestHttpJob::StartTransactionInternal() {
 451   // NOTE: This method assumes that request_info_ is already setup properly.
 452
 453   // If we already have a transaction, then we should restart the transaction
 454   // with auth provided by auth_credentials_.
 455
 456   int rv;
 457
 458   if (network_delegate()) {
 459     network_delegate()->NotifySendHeaders(
 460         request_, request_info_.extra_headers);
 461   }
 462
 463   if (transaction_.get()) {
 464     rv = transaction_->RestartWithAuth(auth_credentials_, start_callback_);
 465     auth_credentials_ = AuthCredentials();
 466   } else {
 467     DCHECK(request_->context()->http_transaction_factory());
 468
 469     rv = request_->context()->http_transaction_factory()->CreateTransaction(
 470         priority_, &transaction_);
 471
 472     if (rv == OK && request_info_.url.SchemeIsWSOrWSS()) {
 473       base::SupportsUserData::Data* data = request_->GetUserData(
 474           WebSocketHandshakeStreamBase::CreateHelper::DataKey());
 475       if (data) {
 476         transaction_->SetWebSocketHandshakeStreamCreateHelper(
 477             static_cast<WebSocketHandshakeStreamBase::CreateHelper*>(data));
 478       } else {
 479         rv = ERR_DISALLOWED_URL_SCHEME;
 480       }
 481     }
 482
 483     if (rv == OK) {
 484       transaction_->SetBeforeNetworkStartCallback(
 485           base::Bind(&URLRequestHttpJob::NotifyBeforeNetworkStart,
 486                      base::Unretained(this)));
 487       transaction_->SetBeforeProxyHeadersSentCallback(
 488           base::Bind(&URLRequestHttpJob::NotifyBeforeSendProxyHeadersCallback,
 489                      base::Unretained(this)));
 490
 491       if (!throttling_entry_.get() ||
 492           !throttling_entry_->ShouldRejectRequest(*request_,
 493                                                   network_delegate())) {
 494         rv = transaction_->Start(
 495             &request_info_, start_callback_, request_->net_log());
 496         start_time_ = base::TimeTicks::Now();
 497       } else {
 498         // Special error code for the exponential back-off module.
 499         rv = ERR_TEMPORARILY_THROTTLED;
 500       }
 501     }
 502   }
 503
 504   if (rv == ERR_IO_PENDING)
 505     return;
 506
 507   // The transaction started synchronously, but we need to notify the
 508   // URLRequest delegate via the message loop.
 509   base::MessageLoop::current()->PostTask(
 510       FROM_HERE,
 511       base::Bind(&URLRequestHttpJob::OnStartCompleted,
 512                  weak_factory_.GetWeakPtr(), rv));
 513 }
 514
 515 void URLRequestHttpJob::AddExtraHeaders() {
 516   SdchManager* sdch_manager = request()->context()->sdch_manager();
 517
 518   // Supply Accept-Encoding field only if it is not already provided.
 519   // It should be provided IF the content is known to have restrictions on
 520   // potential encoding, such as streaming multi-media.
 521   // For details see bug 47381.
 522   // TODO(jar, enal): jpeg files etc. should set up a request header if
 523   // possible. Right now it is done only by buffered_resource_loader and
 524   // simple_data_source.
 525   if (!request_info_.extra_headers.HasHeader(
 526       HttpRequestHeaders::kAcceptEncoding)) {
 527     // We don't support SDCH responses to POST as there is a possibility
 528     // of having SDCH encoded responses returned (e.g. by the cache)
 529     // which we cannot decode, and in those situations, we will need
 530     // to retransmit the request without SDCH, which is illegal for a POST.
 531     bool advertise_sdch = sdch_manager != NULL && request()->method() != "POST";
 532     if (advertise_sdch) {
 533       SdchProblemCode rv = sdch_manager->IsInSupportedDomain(request()->url());
 534       if (rv != SDCH_OK) {
 535         advertise_sdch = false;
 536         // If SDCH is just disabled, it is not a real error.
 537         if (rv != SDCH_DISABLED && rv != SDCH_SECURE_SCHEME_NOT_SUPPORTED) {
 538           SdchManager::SdchErrorRecovery(rv);
 539           request()->net_log().AddEvent(
 540               NetLog::TYPE_SDCH_DECODING_ERROR,
 541               base::Bind(&NetLogSdchResourceProblemCallback, rv));
 542         }
 543       }
 544     }
 545     if (advertise_sdch) {
 546       dictionaries_advertised_ =
 547           sdch_manager->GetDictionarySet(request_->url());
 548     }
 549
 550     // The AllowLatencyExperiment() is only true if we've successfully done a
 551     // full SDCH compression recently in this browser session for this host.
 552     // Note that for this path, there might be no applicable dictionaries,
 553     // and hence we can't participate in the experiment.
 554     if (dictionaries_advertised_ &&
 555         sdch_manager->AllowLatencyExperiment(request_->url())) {
 556       // We are participating in the test (or control), and hence we'll
 557       // eventually record statistics via either SDCH_EXPERIMENT_DECODE or
 558       // SDCH_EXPERIMENT_HOLDBACK, and we'll need some packet timing data.
 559       packet_timing_enabled_ = true;
 560       if (base::RandDouble() < .01) {
 561         sdch_test_control_ = true;  // 1% probability.
 562         dictionaries_advertised_.reset();
 563         advertise_sdch = false;
 564       } else {
 565         sdch_test_activated_ = true;
 566       }
 567     }
 568
 569     // Supply Accept-Encoding headers first so that it is more likely that they
 570     // will be in the first transmitted packet. This can sometimes make it
 571     // easier to filter and analyze the streams to assure that a proxy has not
 572     // damaged these headers. Some proxies deliberately corrupt Accept-Encoding
 573     // headers.
 574     if (!advertise_sdch) {
 575       // Tell the server what compression formats we support (other than SDCH).
 576       request_info_.extra_headers.SetHeader(
 577           HttpRequestHeaders::kAcceptEncoding, "gzip, deflate");
 578     } else {
 579       // Include SDCH in acceptable list.
 580       request_info_.extra_headers.SetHeader(
 581           HttpRequestHeaders::kAcceptEncoding, "gzip, deflate, sdch");
 582       if (dictionaries_advertised_) {
 583         request_info_.extra_headers.SetHeader(
 584             kAvailDictionaryHeader,
 585             dictionaries_advertised_->GetDictionaryClientHashList());
 586         // Since we're tagging this transaction as advertising a dictionary,
 587         // we'll definitely employ an SDCH filter (or tentative sdch filter)
 588         // when we get a response. When done, we'll record histograms via
 589         // SDCH_DECODE or SDCH_PASSTHROUGH. Hence we need to record packet
 590         // arrival times.
 591         packet_timing_enabled_ = true;
 592       }
 593     }
 594   }
 595
 596   if (http_user_agent_settings_) {
 597     // Only add default Accept-Language if the request didn't have it
 598     // specified.
 599     std::string accept_language =
 600         http_user_agent_settings_->GetAcceptLanguage();
 601     if (!accept_language.empty()) {
 602       request_info_.extra_headers.SetHeaderIfMissing(
 603           HttpRequestHeaders::kAcceptLanguage,
 604           accept_language);
 605     }
 606   }
 607 }
 608
 609 void URLRequestHttpJob::AddCookieHeaderAndStart() {
 610   // No matter what, we want to report our status as IO pending since we will
 611   // be notifying our consumer asynchronously via OnStartCompleted.
 612   SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
 613
 614   // If the request was destroyed, then there is no more work to do.
 615   if (!request_)
 616     return;
 617
 618   CookieStore* cookie_store = request_->context()->cookie_store();
 619   if (cookie_store && !(request_info_.load_flags & LOAD_DO_NOT_SEND_COOKIES)) {
 620     cookie_store->GetAllCookiesForURLAsync(
 621         request_->url(),
 622         base::Bind(&URLRequestHttpJob::CheckCookiePolicyAndLoad,
 623                    weak_factory_.GetWeakPtr()));
 624   } else {
 625     DoStartTransaction();
 626   }
 627 }
 628
 629 void URLRequestHttpJob::DoLoadCookies() {
 630   CookieOptions options;
 631   options.set_include_httponly();
 632
 633   // TODO(mkwst): Drop this `if` once we decide whether or not to ship
 634   // first-party cookies: https://crbug.com/459154
 635   if (network_delegate() &&
 636       network_delegate()->FirstPartyOnlyCookieExperimentEnabled())
 637     options.set_first_party_url(request_->first_party_for_cookies());
 638   else
 639     options.set_include_first_party_only();
 640
 641   request_->context()->cookie_store()->GetCookiesWithOptionsAsync(
 642       request_->url(), options, base::Bind(&URLRequestHttpJob::OnCookiesLoaded,
 643                                            weak_factory_.GetWeakPtr()));
 644 }
 645
 646 void URLRequestHttpJob::CheckCookiePolicyAndLoad(
 647     const CookieList& cookie_list) {
 648   if (CanGetCookies(cookie_list))
 649     DoLoadCookies();
 650   else
 651     DoStartTransaction();
 652 }
 653
 654 void URLRequestHttpJob::OnCookiesLoaded(const std::string& cookie_line) {
 655   if (!cookie_line.empty()) {
 656     request_info_.extra_headers.SetHeader(
 657         HttpRequestHeaders::kCookie, cookie_line);
 658     // Disable privacy mode as we are sending cookies anyway.
 659     request_info_.privacy_mode = PRIVACY_MODE_DISABLED;
 660   }
 661   DoStartTransaction();
 662 }
 663
 664 void URLRequestHttpJob::DoStartTransaction() {
 665   // We may have been canceled while retrieving cookies.
 666   if (GetStatus().is_success()) {
 667     StartTransaction();
 668   } else {
 669     NotifyCanceled();
 670   }
 671 }
 672
 673 void URLRequestHttpJob::SaveCookiesAndNotifyHeadersComplete(int result) {
 674   // End of the call started in OnStartCompleted.
 675   OnCallToDelegateComplete();
 676
 677   if (result != OK) {
 678     std::string source("delegate");
 679     request_->net_log().AddEvent(NetLog::TYPE_CANCELLED,
 680                                  NetLog::StringCallback("source", &source));
 681     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
 682     return;
 683   }
 684
 685   DCHECK(transaction_.get());
 686
 687   const HttpResponseInfo* response_info = transaction_->GetResponseInfo();
 688   DCHECK(response_info);
 689
 690   response_cookies_.clear();
 691   response_cookies_save_index_ = 0;
 692
 693   FetchResponseCookies(&response_cookies_);
 694
 695   if (!GetResponseHeaders()->GetDateValue(&response_date_))
 696     response_date_ = base::Time();
 697
 698   // Now, loop over the response cookies, and attempt to persist each.
 699   SaveNextCookie();
 700 }
 701
 702 // If the save occurs synchronously, SaveNextCookie will loop and save the next
 703 // cookie. If the save is deferred, the callback is responsible for continuing
 704 // to iterate through the cookies.
 705 // TODO(erikwright): Modify the CookieStore API to indicate via return value
 706 // whether it completed synchronously or asynchronously.
 707 // See http://crbug.com/131066.
 708 void URLRequestHttpJob::SaveNextCookie() {
 709   // No matter what, we want to report our status as IO pending since we will
 710   // be notifying our consumer asynchronously via OnStartCompleted.
 711   SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
 712
 713   // Used to communicate with the callback. See the implementation of
 714   // OnCookieSaved.
 715   scoped_refptr<SharedBoolean> callback_pending = new SharedBoolean(false);
 716   scoped_refptr<SharedBoolean> save_next_cookie_running =
 717       new SharedBoolean(true);
 718
 719   if (!(request_info_.load_flags & LOAD_DO_NOT_SAVE_COOKIES) &&
 720       request_->context()->cookie_store() && response_cookies_.size() > 0) {
 721     CookieOptions options;
 722     options.set_include_httponly();
 723     options.set_server_time(response_date_);
 724
 725     CookieStore::SetCookiesCallback callback(base::Bind(
 726         &URLRequestHttpJob::OnCookieSaved, weak_factory_.GetWeakPtr(),
 727         save_next_cookie_running, callback_pending));
 728
 729     // Loop through the cookies as long as SetCookieWithOptionsAsync completes
 730     // synchronously.
 731     while (!callback_pending->data &&
 732            response_cookies_save_index_ < response_cookies_.size()) {
 733       if (CanSetCookie(
 734           response_cookies_[response_cookies_save_index_], &options)) {
 735         callback_pending->data = true;
 736         request_->context()->cookie_store()->SetCookieWithOptionsAsync(
 737             request_->url(), response_cookies_[response_cookies_save_index_],
 738             options, callback);
 739       }
 740       ++response_cookies_save_index_;
 741     }
 742   }
 743
 744   save_next_cookie_running->data = false;
 745
 746   if (!callback_pending->data) {
 747     response_cookies_.clear();
 748     response_cookies_save_index_ = 0;
 749     SetStatus(URLRequestStatus());  // Clear the IO_PENDING status
 750     NotifyHeadersComplete();
 751     return;
 752   }
 753 }
 754
 755 // |save_next_cookie_running| is true when the callback is bound and set to
 756 // false when SaveNextCookie exits, allowing the callback to determine if the
 757 // save occurred synchronously or asynchronously.
 758 // |callback_pending| is false when the callback is invoked and will be set to
 759 // true by the callback, allowing SaveNextCookie to detect whether the save
 760 // occurred synchronously.
 761 // See SaveNextCookie() for more information.
 762 void URLRequestHttpJob::OnCookieSaved(
 763     scoped_refptr<SharedBoolean> save_next_cookie_running,
 764     scoped_refptr<SharedBoolean> callback_pending,
 765     bool cookie_status) {
 766   callback_pending->data = false;
 767
 768   // If we were called synchronously, return.
 769   if (save_next_cookie_running->data) {
 770     return;
 771   }
 772
 773   // We were called asynchronously, so trigger the next save.
 774   // We may have been canceled within OnSetCookie.
 775   if (GetStatus().is_success()) {
 776     SaveNextCookie();
 777   } else {
 778     NotifyCanceled();
 779   }
 780 }
 781
 782 void URLRequestHttpJob::FetchResponseCookies(
 783     std::vector<std::string>* cookies) {
 784   const std::string name = "Set-Cookie";
 785   std::string value;
 786
 787   void* iter = NULL;
 788   HttpResponseHeaders* headers = GetResponseHeaders();
 789   while (headers->EnumerateHeader(&iter, name, &value)) {
 790     if (!value.empty())
 791       cookies->push_back(value);
 792   }
 793 }
 794
 795 // NOTE: |ProcessStrictTransportSecurityHeader| and
 796 // |ProcessPublicKeyPinsHeader| have very similar structures, by design.
 797 void URLRequestHttpJob::ProcessStrictTransportSecurityHeader() {
 798   DCHECK(response_info_);
 799   TransportSecurityState* security_state =
 800       request_->context()->transport_security_state();
 801   const SSLInfo& ssl_info = response_info_->ssl_info;
 802
 803   // Only accept HSTS headers on HTTPS connections that have no
 804   // certificate errors.
 805   if (!ssl_info.is_valid() || IsCertStatusError(ssl_info.cert_status) ||
 806       !security_state)
 807     return;
 808
 809   // Don't accept HSTS headers when the hostname is an IP address.
 810   if (request_info_.url.HostIsIPAddress())
 811     return;
 812
 813   // http://tools.ietf.org/html/draft-ietf-websec-strict-transport-sec:
 814   //
 815   //   If a UA receives more than one STS header field in a HTTP response
 816   //   message over secure transport, then the UA MUST process only the
 817   //   first such header field.
 818   HttpResponseHeaders* headers = GetResponseHeaders();
 819   std::string value;
 820   if (headers->EnumerateHeader(NULL, "Strict-Transport-Security", &value))
 821     security_state->AddHSTSHeader(request_info_.url.host(), value);
 822 }
 823
 824 void URLRequestHttpJob::ProcessPublicKeyPinsHeader() {
 825   DCHECK(response_info_);
 826   TransportSecurityState* security_state =
 827       request_->context()->transport_security_state();
 828   const SSLInfo& ssl_info = response_info_->ssl_info;
 829
 830   // Only accept HPKP headers on HTTPS connections that have no
 831   // certificate errors.
 832   if (!ssl_info.is_valid() || IsCertStatusError(ssl_info.cert_status) ||
 833       !security_state)
 834     return;
 835
 836   // Don't accept HSTS headers when the hostname is an IP address.
 837   if (request_info_.url.HostIsIPAddress())
 838     return;
 839
 840   // http://tools.ietf.org/html/draft-ietf-websec-key-pinning:
 841   //
 842   //   If a UA receives more than one PKP header field in an HTTP
 843   //   response message over secure transport, then the UA MUST process
 844   //   only the first such header field.
 845   HttpResponseHeaders* headers = GetResponseHeaders();
 846   std::string value;
 847   if (headers->EnumerateHeader(NULL, "Public-Key-Pins", &value))
 848     security_state->AddHPKPHeader(request_info_.url.host(), value, ssl_info);
 849 }
 850
 851 void URLRequestHttpJob::OnStartCompleted(int result) {
 852   RecordTimer();
 853
 854   // If the request was destroyed, then there is no more work to do.
 855   if (!request_)
 856     return;
 857
 858   // If the job is done (due to cancellation), can just ignore this
 859   // notification.
 860   if (done_)
 861     return;
 862
 863   receive_headers_end_ = base::TimeTicks::Now();
 864
 865   // Clear the IO_PENDING status
 866   SetStatus(URLRequestStatus());
 867
 868   const URLRequestContext* context = request_->context();
 869
 870   if (result == ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN &&
 871       transaction_->GetResponseInfo() != NULL) {
 872     FraudulentCertificateReporter* reporter =
 873       context->fraudulent_certificate_reporter();
 874     if (reporter != NULL) {
 875       const SSLInfo& ssl_info = transaction_->GetResponseInfo()->ssl_info;
 876       const std::string& host = request_->url().host();
 877
 878       reporter->SendReport(host, ssl_info);
 879     }
 880   }
 881
 882   if (result == OK) {
 883     if (transaction_ && transaction_->GetResponseInfo()) {
 884       SetProxyServer(transaction_->GetResponseInfo()->proxy_server);
 885     }
 886     scoped_refptr<HttpResponseHeaders> headers = GetResponseHeaders();
 887     if (network_delegate()) {
 888       // Note that |this| may not be deleted until
 889       // |on_headers_received_callback_| or
 890       // |NetworkDelegate::URLRequestDestroyed()| has been called.
 891       OnCallToDelegate();
 892       allowed_unsafe_redirect_url_ = GURL();
 893       int error = network_delegate()->NotifyHeadersReceived(
 894           request_,
 895           on_headers_received_callback_,
 896           headers.get(),
 897           &override_response_headers_,
 898           &allowed_unsafe_redirect_url_);
 899       if (error != OK) {
 900         if (error == ERR_IO_PENDING) {
 901           awaiting_callback_ = true;
 902         } else {
 903           std::string source("delegate");
 904           request_->net_log().AddEvent(NetLog::TYPE_CANCELLED,
 905                                        NetLog::StringCallback("source",
 906                                                               &source));
 907           OnCallToDelegateComplete();
 908           NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, error));
 909         }
 910         return;
 911       }
 912     }
 913
 914     SaveCookiesAndNotifyHeadersComplete(OK);
 915   } else if (IsCertificateError(result)) {
 916     // We encountered an SSL certificate error.
 917     if (result == ERR_SSL_WEAK_SERVER_EPHEMERAL_DH_KEY ||
 918         result == ERR_SSL_PINNED_KEY_NOT_IN_CERT_CHAIN) {
 919       // These are hard failures. They're handled separately and don't have
 920       // the correct cert status, so set it here.
 921       SSLInfo info(transaction_->GetResponseInfo()->ssl_info);
 922       info.cert_status = MapNetErrorToCertStatus(result);
 923       NotifySSLCertificateError(info, true);
 924     } else {
 925       // Maybe overridable, maybe not. Ask the delegate to decide.
 926       TransportSecurityState* state = context->transport_security_state();
 927       const bool fatal =
 928           state && state->ShouldSSLErrorsBeFatal(request_info_.url.host());
 929       NotifySSLCertificateError(
 930           transaction_->GetResponseInfo()->ssl_info, fatal);
 931     }
 932   } else if (result == ERR_SSL_CLIENT_AUTH_CERT_NEEDED) {
 933     NotifyCertificateRequested(
 934         transaction_->GetResponseInfo()->cert_request_info.get());
 935   } else {
 936     // Even on an error, there may be useful information in the response
 937     // info (e.g. whether there's a cached copy).
 938     if (transaction_.get())
 939       response_info_ = transaction_->GetResponseInfo();
 940     NotifyStartError(URLRequestStatus(URLRequestStatus::FAILED, result));
 941   }
 942 }
 943
 944 void URLRequestHttpJob::OnHeadersReceivedCallback(int result) {
 945   awaiting_callback_ = false;
 946
 947   // Check that there are no callbacks to already canceled requests.
 948   DCHECK_NE(URLRequestStatus::CANCELED, GetStatus().status());
 949
 950   SaveCookiesAndNotifyHeadersComplete(result);
 951 }
 952
 953 void URLRequestHttpJob::OnReadCompleted(int result) {
 954   read_in_progress_ = false;
 955
 956   if (ShouldFixMismatchedContentLength(result))
 957     result = OK;
 958
 959   if (result == OK) {
 960     NotifyDone(URLRequestStatus());
 961   } else if (result < 0) {
 962     NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, result));
 963   } else {
 964     // Clear the IO_PENDING status
 965     SetStatus(URLRequestStatus());
 966   }
 967
 968   NotifyReadComplete(result);
 969 }
 970
 971 void URLRequestHttpJob::RestartTransactionWithAuth(
 972     const AuthCredentials& credentials) {
 973   auth_credentials_ = credentials;
 974
 975   // These will be reset in OnStartCompleted.
 976   response_info_ = NULL;
 977   receive_headers_end_ = base::TimeTicks();
 978   response_cookies_.clear();
 979
 980   ResetTimer();
 981
 982   // Update the cookies, since the cookie store may have been updated from the
 983   // headers in the 401/407. Since cookies were already appended to
 984   // extra_headers, we need to strip them out before adding them again.
 985   request_info_.extra_headers.RemoveHeader(HttpRequestHeaders::kCookie);
 986
 987   AddCookieHeaderAndStart();
 988 }
 989
 990 void URLRequestHttpJob::SetUpload(UploadDataStream* upload) {
 991   DCHECK(!transaction_.get()) << "cannot change once started";
 992   request_info_.upload_data_stream = upload;
 993 }
 994
 995 void URLRequestHttpJob::SetExtraRequestHeaders(
 996     const HttpRequestHeaders& headers) {
 997   DCHECK(!transaction_.get()) << "cannot change once started";
 998   request_info_.extra_headers.CopyFrom(headers);
 999 }
1000
1001 LoadState URLRequestHttpJob::GetLoadState() const {
1002   return transaction_.get() ?
1003       transaction_->GetLoadState() : LOAD_STATE_IDLE;
1004 }
1005
1006 UploadProgress URLRequestHttpJob::GetUploadProgress() const {
1007   return transaction_.get() ?
1008       transaction_->GetUploadProgress() : UploadProgress();
1009 }
1010
1011 bool URLRequestHttpJob::GetMimeType(std::string* mime_type) const {
1012   DCHECK(transaction_.get());
1013
1014   if (!response_info_)
1015     return false;
1016
1017   HttpResponseHeaders* headers = GetResponseHeaders();
1018   if (!headers)
1019     return false;
1020   return headers->GetMimeType(mime_type);
1021 }
1022
1023 bool URLRequestHttpJob::GetCharset(std::string* charset) {
1024   DCHECK(transaction_.get());
1025
1026   if (!response_info_)
1027     return false;
1028
1029   return GetResponseHeaders()->GetCharset(charset);
1030 }
1031
1032 void URLRequestHttpJob::GetResponseInfo(HttpResponseInfo* info) {
1033   DCHECK(request_);
1034
1035   if (response_info_) {
1036     DCHECK(transaction_.get());
1037
1038     *info = *response_info_;
1039     if (override_response_headers_.get())
1040       info->headers = override_response_headers_;
1041   }
1042 }
1043
1044 void URLRequestHttpJob::GetLoadTimingInfo(
1045     LoadTimingInfo* load_timing_info) const {
1046   // If haven't made it far enough to receive any headers, don't return
1047   // anything. This makes for more consistent behavior in the case of errors.
1048   if (!transaction_ || receive_headers_end_.is_null())
1049     return;
1050   if (transaction_->GetLoadTimingInfo(load_timing_info))
1051     load_timing_info->receive_headers_end = receive_headers_end_;
1052 }
1053
1054 bool URLRequestHttpJob::GetResponseCookies(std::vector<std::string>* cookies) {
1055   DCHECK(transaction_.get());
1056
1057   if (!response_info_)
1058     return false;
1059
1060   // TODO(darin): Why are we extracting response cookies again?  Perhaps we
1061   // should just leverage response_cookies_.
1062
1063   cookies->clear();
1064   FetchResponseCookies(cookies);
1065   return true;
1066 }
1067
1068 int URLRequestHttpJob::GetResponseCode() const {
1069   DCHECK(transaction_.get());
1070
1071   if (!response_info_)
1072     return -1;
1073
1074   return GetResponseHeaders()->response_code();
1075 }
1076
1077 Filter* URLRequestHttpJob::SetupFilter() const {
1078   DCHECK(transaction_.get());
1079   if (!response_info_)
1080     return NULL;
1081
1082   std::vector<Filter::FilterType> encoding_types;
1083   std::string encoding_type;
1084   HttpResponseHeaders* headers = GetResponseHeaders();
1085   void* iter = NULL;
1086   while (headers->EnumerateHeader(&iter, "Content-Encoding", &encoding_type)) {
1087     encoding_types.push_back(Filter::ConvertEncodingToType(encoding_type));
1088   }
1089
1090   // Even if encoding types are empty, there is a chance that we need to add
1091   // some decoding, as some proxies strip encoding completely. In such cases,
1092   // we may need to add (for example) SDCH filtering (when the context suggests
1093   // it is appropriate).
1094   Filter::FixupEncodingTypes(*filter_context_, &encoding_types);
1095
1096   return !encoding_types.empty()
1097       ? Filter::Factory(encoding_types, *filter_context_) : NULL;
1098 }
1099
1100 bool URLRequestHttpJob::CopyFragmentOnRedirect(const GURL& location) const {
1101   // Allow modification of reference fragments by default, unless
1102   // |allowed_unsafe_redirect_url_| is set and equal to the redirect URL.
1103   // When this is the case, we assume that the network delegate has set the
1104   // desired redirect URL (with or without fragment), so it must not be changed
1105   // any more.
1106   return !allowed_unsafe_redirect_url_.is_valid() ||
1107        allowed_unsafe_redirect_url_ != location;
1108 }
1109
1110 bool URLRequestHttpJob::IsSafeRedirect(const GURL& location) {
1111   // HTTP is always safe.
1112   // TODO(pauljensen): Remove once crbug.com/146591 is fixed.
1113   if (location.is_valid() &&
1114       (location.scheme() == "http" || location.scheme() == "https")) {
1115     return true;
1116   }
1117   // Delegates may mark a URL as safe for redirection.
1118   if (allowed_unsafe_redirect_url_.is_valid() &&
1119       allowed_unsafe_redirect_url_ == location) {
1120     return true;
1121   }
1122   // Query URLRequestJobFactory as to whether |location| would be safe to
1123   // redirect to.
1124   return request_->context()->job_factory() &&
1125       request_->context()->job_factory()->IsSafeRedirectTarget(location);
1126 }
1127
1128 bool URLRequestHttpJob::NeedsAuth() {
1129   int code = GetResponseCode();
1130   if (code == -1)
1131     return false;
1132
1133   // Check if we need either Proxy or WWW Authentication. This could happen
1134   // because we either provided no auth info, or provided incorrect info.
1135   switch (code) {
1136     case 407:
1137       if (proxy_auth_state_ == AUTH_STATE_CANCELED)
1138         return false;
1139       proxy_auth_state_ = AUTH_STATE_NEED_AUTH;
1140       return true;
1141     case 401:
1142       if (server_auth_state_ == AUTH_STATE_CANCELED)
1143         return false;
1144       server_auth_state_ = AUTH_STATE_NEED_AUTH;
1145       return true;
1146   }
1147   return false;
1148 }
1149
1150 void URLRequestHttpJob::GetAuthChallengeInfo(
1151     scoped_refptr<AuthChallengeInfo>* result) {
1152   DCHECK(transaction_.get());
1153   DCHECK(response_info_);
1154
1155   // sanity checks:
1156   DCHECK(proxy_auth_state_ == AUTH_STATE_NEED_AUTH ||
1157          server_auth_state_ == AUTH_STATE_NEED_AUTH);
1158   DCHECK((GetResponseHeaders()->response_code() == HTTP_UNAUTHORIZED) ||
1159          (GetResponseHeaders()->response_code() ==
1160           HTTP_PROXY_AUTHENTICATION_REQUIRED));
1161
1162   *result = response_info_->auth_challenge;
1163 }
1164
1165 void URLRequestHttpJob::SetAuth(const AuthCredentials& credentials) {
1166   DCHECK(transaction_.get());
1167
1168   // Proxy gets set first, then WWW.
1169   if (proxy_auth_state_ == AUTH_STATE_NEED_AUTH) {
1170     proxy_auth_state_ = AUTH_STATE_HAVE_AUTH;
1171   } else {
1172     DCHECK_EQ(server_auth_state_, AUTH_STATE_NEED_AUTH);
1173     server_auth_state_ = AUTH_STATE_HAVE_AUTH;
1174   }
1175
1176   RestartTransactionWithAuth(credentials);
1177 }
1178
1179 void URLRequestHttpJob::CancelAuth() {
1180   // Proxy gets set first, then WWW.
1181   if (proxy_auth_state_ == AUTH_STATE_NEED_AUTH) {
1182     proxy_auth_state_ = AUTH_STATE_CANCELED;
1183   } else {
1184     DCHECK_EQ(server_auth_state_, AUTH_STATE_NEED_AUTH);
1185     server_auth_state_ = AUTH_STATE_CANCELED;
1186   }
1187
1188   // These will be reset in OnStartCompleted.
1189   response_info_ = NULL;
1190   receive_headers_end_ = base::TimeTicks::Now();
1191   response_cookies_.clear();
1192
1193   ResetTimer();
1194
1195   // OK, let the consumer read the error page...
1196   //
1197   // Because we set the AUTH_STATE_CANCELED flag, NeedsAuth will return false,
1198   // which will cause the consumer to receive OnResponseStarted instead of
1199   // OnAuthRequired.
1200   //
1201   // We have to do this via InvokeLater to avoid "recursing" the consumer.
1202   //
1203   base::MessageLoop::current()->PostTask(
1204       FROM_HERE,
1205       base::Bind(&URLRequestHttpJob::OnStartCompleted,
1206                  weak_factory_.GetWeakPtr(), OK));
1207 }
1208
1209 void URLRequestHttpJob::ContinueWithCertificate(
1210     X509Certificate* client_cert) {
1211   DCHECK(transaction_.get());
1212
1213   DCHECK(!response_info_) << "should not have a response yet";
1214   receive_headers_end_ = base::TimeTicks();
1215
1216   ResetTimer();
1217
1218   // No matter what, we want to report our status as IO pending since we will
1219   // be notifying our consumer asynchronously via OnStartCompleted.
1220   SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
1221
1222   int rv = transaction_->RestartWithCertificate(client_cert, start_callback_);
1223   if (rv == ERR_IO_PENDING)
1224     return;
1225
1226   // The transaction started synchronously, but we need to notify the
1227   // URLRequest delegate via the message loop.
1228   base::MessageLoop::current()->PostTask(
1229       FROM_HERE,
1230       base::Bind(&URLRequestHttpJob::OnStartCompleted,
1231                  weak_factory_.GetWeakPtr(), rv));
1232 }
1233
1234 void URLRequestHttpJob::ContinueDespiteLastError() {
1235   // If the transaction was destroyed, then the job was cancelled.
1236   if (!transaction_.get())
1237     return;
1238
1239   DCHECK(!response_info_) << "should not have a response yet";
1240   receive_headers_end_ = base::TimeTicks();
1241
1242   ResetTimer();
1243
1244   // No matter what, we want to report our status as IO pending since we will
1245   // be notifying our consumer asynchronously via OnStartCompleted.
1246   SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
1247
1248   int rv = transaction_->RestartIgnoringLastError(start_callback_);
1249   if (rv == ERR_IO_PENDING)
1250     return;
1251
1252   // The transaction started synchronously, but we need to notify the
1253   // URLRequest delegate via the message loop.
1254   base::MessageLoop::current()->PostTask(
1255       FROM_HERE,
1256       base::Bind(&URLRequestHttpJob::OnStartCompleted,
1257                  weak_factory_.GetWeakPtr(), rv));
1258 }
1259
1260 void URLRequestHttpJob::ResumeNetworkStart() {
1261   DCHECK(transaction_.get());
1262   transaction_->ResumeNetworkStart();
1263 }
1264
1265 bool URLRequestHttpJob::ShouldFixMismatchedContentLength(int rv) const {
1266   // Some servers send the body compressed, but specify the content length as
1267   // the uncompressed size. Although this violates the HTTP spec we want to
1268   // support it (as IE and FireFox do), but *only* for an exact match.
1269   // See http://crbug.com/79694.
1270   if (rv == ERR_CONTENT_LENGTH_MISMATCH ||
1271       rv == ERR_INCOMPLETE_CHUNKED_ENCODING) {
1272     if (request_ && request_->response_headers()) {
1273       int64 expected_length = request_->response_headers()->GetContentLength();
1274       VLOG(1) << __FUNCTION__ << "() "
1275               << "\"" << request_->url().spec() << "\""
1276               << " content-length = " << expected_length
1277               << " pre total = " << prefilter_bytes_read()
1278               << " post total = " << postfilter_bytes_read();
1279       if (postfilter_bytes_read() == expected_length) {
1280         // Clear the error.
1281         return true;
1282       }
1283     }
1284   }
1285   return false;
1286 }
1287
1288 bool URLRequestHttpJob::ReadRawData(IOBuffer* buf, int buf_size,
1289                                     int* bytes_read) {
1290   DCHECK_NE(buf_size, 0);
1291   DCHECK(bytes_read);
1292   DCHECK(!read_in_progress_);
1293
1294   int rv = transaction_->Read(
1295       buf, buf_size,
1296       base::Bind(&URLRequestHttpJob::OnReadCompleted, base::Unretained(this)));
1297
1298   if (ShouldFixMismatchedContentLength(rv))
1299     rv = 0;
1300
1301   if (rv >= 0) {
1302     *bytes_read = rv;
1303     if (!rv)
1304       DoneWithRequest(FINISHED);
1305     return true;
1306   }
1307
1308   if (rv == ERR_IO_PENDING) {
1309     read_in_progress_ = true;
1310     SetStatus(URLRequestStatus(URLRequestStatus::IO_PENDING, 0));
1311   } else {
1312     NotifyDone(URLRequestStatus(URLRequestStatus::FAILED, rv));
1313   }
1314
1315   return false;
1316 }
1317
1318 void URLRequestHttpJob::StopCaching() {
1319   if (transaction_.get())
1320     transaction_->StopCaching();
1321 }
1322
1323 bool URLRequestHttpJob::GetFullRequestHeaders(
1324     HttpRequestHeaders* headers) const {
1325   if (!transaction_)
1326     return false;
1327
1328   return transaction_->GetFullRequestHeaders(headers);
1329 }
1330
1331 int64 URLRequestHttpJob::GetTotalReceivedBytes() const {
1332   if (!transaction_)
1333     return 0;
1334
1335   return transaction_->GetTotalReceivedBytes();
1336 }
1337
1338 void URLRequestHttpJob::DoneReading() {
1339   if (transaction_) {
1340     transaction_->DoneReading();
1341   }
1342   DoneWithRequest(FINISHED);
1343 }
1344
1345 void URLRequestHttpJob::DoneReadingRedirectResponse() {
1346   if (transaction_) {
1347     if (transaction_->GetResponseInfo()->headers->IsRedirect(NULL)) {
1348       // If the original headers indicate a redirect, go ahead and cache the
1349       // response, even if the |override_response_headers_| are a redirect to
1350       // another location.
1351       transaction_->DoneReading();
1352     } else {
1353       // Otherwise, |override_response_headers_| must be non-NULL and contain
1354       // bogus headers indicating a redirect.
1355       DCHECK(override_response_headers_.get());
1356       DCHECK(override_response_headers_->IsRedirect(NULL));
1357       transaction_->StopCaching();
1358     }
1359   }
1360   DoneWithRequest(FINISHED);
1361 }
1362
1363 HostPortPair URLRequestHttpJob::GetSocketAddress() const {
1364   return response_info_ ? response_info_->socket_address : HostPortPair();
1365 }
1366
1367 void URLRequestHttpJob::RecordTimer() {
1368   if (request_creation_time_.is_null()) {
1369     NOTREACHED()
1370         << "The same transaction shouldn't start twice without new timing.";
1371     return;
1372   }
1373
1374   base::TimeDelta to_start = base::Time::Now() - request_creation_time_;
1375   request_creation_time_ = base::Time();
1376
1377   UMA_HISTOGRAM_MEDIUM_TIMES("Net.HttpTimeToFirstByte", to_start);
1378 }
1379
1380 void URLRequestHttpJob::ResetTimer() {
1381   if (!request_creation_time_.is_null()) {
1382     NOTREACHED()
1383         << "The timer was reset before it was recorded.";
1384     return;
1385   }
1386   request_creation_time_ = base::Time::Now();
1387 }
1388
1389 void URLRequestHttpJob::UpdatePacketReadTimes() {
1390   if (!packet_timing_enabled_)
1391     return;
1392
1393   DCHECK_GT(prefilter_bytes_read(), bytes_observed_in_packets_);
1394
1395   base::Time now(base::Time::Now());
1396   if (!bytes_observed_in_packets_)
1397     request_time_snapshot_ = now;
1398   final_packet_time_ = now;
1399
1400   bytes_observed_in_packets_ = prefilter_bytes_read();
1401 }
1402
1403 void URLRequestHttpJob::RecordPacketStats(
1404     FilterContext::StatisticSelector statistic) const {
1405   if (!packet_timing_enabled_ || (final_packet_time_ == base::Time()))
1406     return;
1407
1408   base::TimeDelta duration = final_packet_time_ - request_time_snapshot_;
1409   switch (statistic) {
1410     case FilterContext::SDCH_DECODE: {
1411       UMA_HISTOGRAM_CUSTOM_COUNTS("Sdch3.Network_Decode_Bytes_Processed_b",
1412           static_cast<int>(bytes_observed_in_packets_), 500, 100000, 100);
1413       return;
1414     }
1415     case FilterContext::SDCH_PASSTHROUGH: {
1416       // Despite advertising a dictionary, we handled non-sdch compressed
1417       // content.
1418       return;
1419     }
1420
1421     case FilterContext::SDCH_EXPERIMENT_DECODE: {
1422       UMA_HISTOGRAM_CUSTOM_TIMES("Sdch3.Experiment3_Decode",
1423                                   duration,
1424                                   base::TimeDelta::FromMilliseconds(20),
1425                                   base::TimeDelta::FromMinutes(10), 100);
1426       return;
1427     }
1428     case FilterContext::SDCH_EXPERIMENT_HOLDBACK: {
1429       UMA_HISTOGRAM_CUSTOM_TIMES("Sdch3.Experiment3_Holdback",
1430                                   duration,
1431                                   base::TimeDelta::FromMilliseconds(20),
1432                                   base::TimeDelta::FromMinutes(10), 100);
1433       return;
1434     }
1435     default:
1436       NOTREACHED();
1437       return;
1438   }
1439 }
1440
1441 void URLRequestHttpJob::RecordPerfHistograms(CompletionCause reason) {
1442   if (start_time_.is_null())
1443     return;
1444
1445   base::TimeDelta total_time = base::TimeTicks::Now() - start_time_;
1446   UMA_HISTOGRAM_TIMES("Net.HttpJob.TotalTime", total_time);
1447
1448   if (reason == FINISHED) {
1449     UMA_HISTOGRAM_TIMES("Net.HttpJob.TotalTimeSuccess", total_time);
1450   } else {
1451     UMA_HISTOGRAM_TIMES("Net.HttpJob.TotalTimeCancel", total_time);
1452   }
1453
1454   if (response_info_) {
1455     if (response_info_->was_cached) {
1456       UMA_HISTOGRAM_TIMES("Net.HttpJob.TotalTimeCached", total_time);
1457     } else  {
1458       UMA_HISTOGRAM_TIMES("Net.HttpJob.TotalTimeNotCached", total_time);
1459     }
1460   }
1461
1462   if (request_info_.load_flags & LOAD_PREFETCH && !request_->was_cached())
1463     UMA_HISTOGRAM_COUNTS("Net.Prefetch.PrefilterBytesReadFromNetwork",
1464                          prefilter_bytes_read());
1465
1466   start_time_ = base::TimeTicks();
1467 }
1468
1469 void URLRequestHttpJob::DoneWithRequest(CompletionCause reason) {
1470   if (done_)
1471     return;
1472   done_ = true;
1473   RecordPerfHistograms(reason);
1474   if (reason == FINISHED) {
1475     request_->set_received_response_content_length(prefilter_bytes_read());
1476   }
1477 }
1478
1479 HttpResponseHeaders* URLRequestHttpJob::GetResponseHeaders() const {
1480   DCHECK(transaction_.get());
1481   DCHECK(transaction_->GetResponseInfo());
1482   return override_response_headers_.get() ?
1483              override_response_headers_.get() :
1484              transaction_->GetResponseInfo()->headers.get();
1485 }
1486
1487 void URLRequestHttpJob::NotifyURLRequestDestroyed() {
1488   awaiting_callback_ = false;
1489 }
1490
1491 }  // namespace net