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