net/url_request/url_request_throttler_unittest.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_throttler_manager.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/metrics/histogram_samples.h"
   9 #include "base/pickle.h"
  10 #include "base/stl_util.h"
  11 #include "base/strings/string_number_conversions.h"
  12 #include "base/strings/stringprintf.h"
  13 #include "base/test/histogram_tester.h"
  14 #include "base/time/time.h"
  15 #include "net/base/load_flags.h"
  16 #include "net/base/request_priority.h"
  17 #include "net/base/test_completion_callback.h"
  18 #include "net/url_request/url_request.h"
  19 #include "net/url_request/url_request_context.h"
  20 #include "net/url_request/url_request_test_util.h"
  21 #include "net/url_request/url_request_throttler_header_interface.h"
  22 #include "net/url_request/url_request_throttler_test_support.h"
  23 #include "testing/gtest/include/gtest/gtest.h"
  24
  25 using base::TimeDelta;
  26 using base::TimeTicks;
  27
  28 namespace net {
  29
  30 namespace {
  31
  32 const char kRequestThrottledHistogramName[] = "Throttling.RequestThrottled";
  33
  34 class MockURLRequestThrottlerEntry : public URLRequestThrottlerEntry {
  35  public:
  36   explicit MockURLRequestThrottlerEntry(
  37       URLRequestThrottlerManager* manager)
  38       : URLRequestThrottlerEntry(manager, std::string()),
  39         mock_backoff_entry_(&backoff_policy_) {
  40     InitPolicy();
  41   }
  42   MockURLRequestThrottlerEntry(
  43       URLRequestThrottlerManager* manager,
  44       const TimeTicks& exponential_backoff_release_time,
  45       const TimeTicks& sliding_window_release_time,
  46       const TimeTicks& fake_now)
  47       : URLRequestThrottlerEntry(manager, std::string()),
  48         fake_time_now_(fake_now),
  49         mock_backoff_entry_(&backoff_policy_) {
  50     InitPolicy();
  51
  52     mock_backoff_entry_.set_fake_now(fake_now);
  53     set_exponential_backoff_release_time(exponential_backoff_release_time);
  54     set_sliding_window_release_time(sliding_window_release_time);
  55   }
  56
  57   void InitPolicy() {
  58     // Some tests become flaky if we have jitter.
  59     backoff_policy_.jitter_factor = 0.0;
  60
  61     // This lets us avoid having to make multiple failures initially (this
  62     // logic is already tested in the BackoffEntry unit tests).
  63     backoff_policy_.num_errors_to_ignore = 0;
  64   }
  65
  66   const BackoffEntry* GetBackoffEntry() const override {
  67     return &mock_backoff_entry_;
  68   }
  69
  70   BackoffEntry* GetBackoffEntry() override { return &mock_backoff_entry_; }
  71
  72   static bool ExplicitUserRequest(int load_flags) {
  73     return URLRequestThrottlerEntry::ExplicitUserRequest(load_flags);
  74   }
  75
  76   void ResetToBlank(const TimeTicks& time_now) {
  77     fake_time_now_ = time_now;
  78     mock_backoff_entry_.set_fake_now(time_now);
  79
  80     GetBackoffEntry()->Reset();
  81     GetBackoffEntry()->SetCustomReleaseTime(time_now);
  82     set_sliding_window_release_time(time_now);
  83   }
  84
  85   // Overridden for tests.
  86   TimeTicks ImplGetTimeNow() const override { return fake_time_now_; }
  87
  88   void set_exponential_backoff_release_time(
  89       const base::TimeTicks& release_time) {
  90     GetBackoffEntry()->SetCustomReleaseTime(release_time);
  91   }
  92
  93   base::TimeTicks sliding_window_release_time() const {
  94     return URLRequestThrottlerEntry::sliding_window_release_time();
  95   }
  96
  97   void set_sliding_window_release_time(
  98       const base::TimeTicks& release_time) {
  99     URLRequestThrottlerEntry::set_sliding_window_release_time(
 100         release_time);
 101   }
 102
 103   TimeTicks fake_time_now_;
 104   MockBackoffEntry mock_backoff_entry_;
 105
 106  protected:
 107   ~MockURLRequestThrottlerEntry() override {}
 108 };
 109
 110 class MockURLRequestThrottlerManager : public URLRequestThrottlerManager {
 111  public:
 112   MockURLRequestThrottlerManager() : create_entry_index_(0) {}
 113
 114   // Method to process the URL using URLRequestThrottlerManager protected
 115   // method.
 116   std::string DoGetUrlIdFromUrl(const GURL& url) { return GetIdFromUrl(url); }
 117
 118   // Method to use the garbage collecting method of URLRequestThrottlerManager.
 119   void DoGarbageCollectEntries() { GarbageCollectEntries(); }
 120
 121   // Returns the number of entries in the map.
 122   int GetNumberOfEntries() const { return GetNumberOfEntriesForTests(); }
 123
 124   void CreateEntry(bool is_outdated) {
 125     TimeTicks time = TimeTicks::Now();
 126     if (is_outdated) {
 127       time -= TimeDelta::FromMilliseconds(
 128           MockURLRequestThrottlerEntry::kDefaultEntryLifetimeMs + 1000);
 129     }
 130     std::string fake_url_string("http://www.fakeurl.com/");
 131     fake_url_string.append(base::IntToString(create_entry_index_++));
 132     GURL fake_url(fake_url_string);
 133     OverrideEntryForTests(
 134         fake_url,
 135         new MockURLRequestThrottlerEntry(this, time, TimeTicks::Now(),
 136                                          TimeTicks::Now()));
 137   }
 138
 139  private:
 140   int create_entry_index_;
 141 };
 142
 143 struct TimeAndBool {
 144   TimeAndBool(const TimeTicks& time_value, bool expected, int line_num) {
 145     time = time_value;
 146     result = expected;
 147     line = line_num;
 148   }
 149   TimeTicks time;
 150   bool result;
 151   int line;
 152 };
 153
 154 struct GurlAndString {
 155   GurlAndString(const GURL& url_value,
 156                 const std::string& expected,
 157                 int line_num) {
 158     url = url_value;
 159     result = expected;
 160     line = line_num;
 161   }
 162   GURL url;
 163   std::string result;
 164   int line;
 165 };
 166
 167 }  // namespace
 168
 169 class URLRequestThrottlerEntryTest : public testing::Test {
 170  protected:
 171   URLRequestThrottlerEntryTest()
 172       : request_(context_.CreateRequest(GURL(), DEFAULT_PRIORITY, NULL, NULL)) {
 173   }
 174
 175   void SetUp() override;
 176
 177   TimeTicks now_;
 178   MockURLRequestThrottlerManager manager_;  // Dummy object, not used.
 179   scoped_refptr<MockURLRequestThrottlerEntry> entry_;
 180
 181   TestURLRequestContext context_;
 182   scoped_ptr<URLRequest> request_;
 183 };
 184
 185 void URLRequestThrottlerEntryTest::SetUp() {
 186   request_->SetLoadFlags(0);
 187
 188   now_ = TimeTicks::Now();
 189   entry_ = new MockURLRequestThrottlerEntry(&manager_);
 190   entry_->ResetToBlank(now_);
 191 }
 192
 193 std::ostream& operator<<(std::ostream& out, const base::TimeTicks& time) {
 194   return out << time.ToInternalValue();
 195 }
 196
 197 TEST_F(URLRequestThrottlerEntryTest, CanThrottleRequest) {
 198   TestNetworkDelegate d;
 199   context_.set_network_delegate(&d);
 200   entry_->set_exponential_backoff_release_time(
 201       entry_->fake_time_now_ + TimeDelta::FromMilliseconds(1));
 202
 203   d.set_can_throttle_requests(false);
 204   EXPECT_FALSE(entry_->ShouldRejectRequest(*request_,
 205                                            context_.network_delegate()));
 206   d.set_can_throttle_requests(true);
 207   EXPECT_TRUE(entry_->ShouldRejectRequest(*request_,
 208                                           context_.network_delegate()));
 209 }
 210
 211 TEST_F(URLRequestThrottlerEntryTest, InterfaceDuringExponentialBackoff) {
 212   base::HistogramTester histogram_tester;
 213   entry_->set_exponential_backoff_release_time(
 214       entry_->fake_time_now_ + TimeDelta::FromMilliseconds(1));
 215   EXPECT_TRUE(entry_->ShouldRejectRequest(*request_,
 216                                           context_.network_delegate()));
 217
 218   // Also end-to-end test the load flags exceptions.
 219   request_->SetLoadFlags(LOAD_MAYBE_USER_GESTURE);
 220   EXPECT_FALSE(entry_->ShouldRejectRequest(*request_,
 221                                            context_.network_delegate()));
 222
 223   histogram_tester.ExpectBucketCount(kRequestThrottledHistogramName, 0, 1);
 224   histogram_tester.ExpectBucketCount(kRequestThrottledHistogramName, 1, 1);
 225 }
 226
 227 TEST_F(URLRequestThrottlerEntryTest, InterfaceNotDuringExponentialBackoff) {
 228   base::HistogramTester histogram_tester;
 229   entry_->set_exponential_backoff_release_time(entry_->fake_time_now_);
 230   EXPECT_FALSE(entry_->ShouldRejectRequest(*request_,
 231                                            context_.network_delegate()));
 232   entry_->set_exponential_backoff_release_time(
 233       entry_->fake_time_now_ - TimeDelta::FromMilliseconds(1));
 234   EXPECT_FALSE(entry_->ShouldRejectRequest(*request_,
 235                                            context_.network_delegate()));
 236
 237   histogram_tester.ExpectBucketCount(kRequestThrottledHistogramName, 0, 2);
 238   histogram_tester.ExpectBucketCount(kRequestThrottledHistogramName, 1, 0);
 239 }
 240
 241 TEST_F(URLRequestThrottlerEntryTest, InterfaceUpdateFailure) {
 242   MockURLRequestThrottlerHeaderAdapter failure_response(503);
 243   entry_->UpdateWithResponse(std::string(), &failure_response);
 244   EXPECT_GT(entry_->GetExponentialBackoffReleaseTime(), entry_->fake_time_now_)
 245       << "A failure should increase the release_time";
 246 }
 247
 248 TEST_F(URLRequestThrottlerEntryTest, InterfaceUpdateSuccess) {
 249   MockURLRequestThrottlerHeaderAdapter success_response(200);
 250   entry_->UpdateWithResponse(std::string(), &success_response);
 251   EXPECT_EQ(entry_->GetExponentialBackoffReleaseTime(), entry_->fake_time_now_)
 252       << "A success should not add any delay";
 253 }
 254
 255 TEST_F(URLRequestThrottlerEntryTest, InterfaceUpdateSuccessThenFailure) {
 256   MockURLRequestThrottlerHeaderAdapter failure_response(503);
 257   MockURLRequestThrottlerHeaderAdapter success_response(200);
 258   entry_->UpdateWithResponse(std::string(), &success_response);
 259   entry_->UpdateWithResponse(std::string(), &failure_response);
 260   EXPECT_GT(entry_->GetExponentialBackoffReleaseTime(), entry_->fake_time_now_)
 261       << "This scenario should add delay";
 262   entry_->UpdateWithResponse(std::string(), &success_response);
 263 }
 264
 265 TEST_F(URLRequestThrottlerEntryTest, IsEntryReallyOutdated) {
 266   TimeDelta lifetime = TimeDelta::FromMilliseconds(
 267       MockURLRequestThrottlerEntry::kDefaultEntryLifetimeMs);
 268   const TimeDelta kFiveMs = TimeDelta::FromMilliseconds(5);
 269
 270   TimeAndBool test_values[] = {
 271       TimeAndBool(now_, false, __LINE__),
 272       TimeAndBool(now_ - kFiveMs, false, __LINE__),
 273       TimeAndBool(now_ + kFiveMs, false, __LINE__),
 274       TimeAndBool(now_ - (lifetime - kFiveMs), false, __LINE__),
 275       TimeAndBool(now_ - lifetime, true, __LINE__),
 276       TimeAndBool(now_ - (lifetime + kFiveMs), true, __LINE__)};
 277
 278   for (unsigned int i = 0; i < arraysize(test_values); ++i) {
 279     entry_->set_exponential_backoff_release_time(test_values[i].time);
 280     EXPECT_EQ(entry_->IsEntryOutdated(), test_values[i].result) <<
 281         "Test case #" << i << " line " << test_values[i].line << " failed";
 282   }
 283 }
 284
 285 TEST_F(URLRequestThrottlerEntryTest, MaxAllowedBackoff) {
 286   for (int i = 0; i < 30; ++i) {
 287     MockURLRequestThrottlerHeaderAdapter response_adapter(503);
 288     entry_->UpdateWithResponse(std::string(), &response_adapter);
 289   }
 290
 291   TimeDelta delay = entry_->GetExponentialBackoffReleaseTime() - now_;
 292   EXPECT_EQ(delay.InMilliseconds(),
 293             MockURLRequestThrottlerEntry::kDefaultMaximumBackoffMs);
 294 }
 295
 296 TEST_F(URLRequestThrottlerEntryTest, MalformedContent) {
 297   MockURLRequestThrottlerHeaderAdapter response_adapter(503);
 298   for (int i = 0; i < 5; ++i)
 299     entry_->UpdateWithResponse(std::string(), &response_adapter);
 300
 301   TimeTicks release_after_failures = entry_->GetExponentialBackoffReleaseTime();
 302
 303   // Inform the entry that a response body was malformed, which is supposed to
 304   // increase the back-off time.  Note that we also submit a successful
 305   // UpdateWithResponse to pair with ReceivedContentWasMalformed() since that
 306   // is what happens in practice (if a body is received, then a non-500
 307   // response must also have been received).
 308   entry_->ReceivedContentWasMalformed(200);
 309   MockURLRequestThrottlerHeaderAdapter success_adapter(200);
 310   entry_->UpdateWithResponse(std::string(), &success_adapter);
 311   EXPECT_GT(entry_->GetExponentialBackoffReleaseTime(), release_after_failures);
 312 }
 313
 314 TEST_F(URLRequestThrottlerEntryTest, SlidingWindow) {
 315   int max_send = URLRequestThrottlerEntry::kDefaultMaxSendThreshold;
 316   int sliding_window =
 317       URLRequestThrottlerEntry::kDefaultSlidingWindowPeriodMs;
 318
 319   TimeTicks time_1 = entry_->fake_time_now_ +
 320       TimeDelta::FromMilliseconds(sliding_window / 3);
 321   TimeTicks time_2 = entry_->fake_time_now_ +
 322       TimeDelta::FromMilliseconds(2 * sliding_window / 3);
 323   TimeTicks time_3 = entry_->fake_time_now_ +
 324       TimeDelta::FromMilliseconds(sliding_window);
 325   TimeTicks time_4 = entry_->fake_time_now_ +
 326       TimeDelta::FromMilliseconds(sliding_window + 2 * sliding_window / 3);
 327
 328   entry_->set_exponential_backoff_release_time(time_1);
 329
 330   for (int i = 0; i < max_send / 2; ++i) {
 331     EXPECT_EQ(2 * sliding_window / 3,
 332               entry_->ReserveSendingTimeForNextRequest(time_2));
 333   }
 334   EXPECT_EQ(time_2, entry_->sliding_window_release_time());
 335
 336   entry_->fake_time_now_ = time_3;
 337
 338   for (int i = 0; i < (max_send + 1) / 2; ++i)
 339     EXPECT_EQ(0, entry_->ReserveSendingTimeForNextRequest(TimeTicks()));
 340
 341   EXPECT_EQ(time_4, entry_->sliding_window_release_time());
 342 }
 343
 344 TEST_F(URLRequestThrottlerEntryTest, ExplicitUserRequest) {
 345   ASSERT_FALSE(MockURLRequestThrottlerEntry::ExplicitUserRequest(0));
 346   ASSERT_TRUE(MockURLRequestThrottlerEntry::ExplicitUserRequest(
 347       LOAD_MAYBE_USER_GESTURE));
 348   ASSERT_FALSE(MockURLRequestThrottlerEntry::ExplicitUserRequest(
 349       ~LOAD_MAYBE_USER_GESTURE));
 350 }
 351
 352 class URLRequestThrottlerManagerTest : public testing::Test {
 353  protected:
 354   URLRequestThrottlerManagerTest()
 355       : request_(context_.CreateRequest(GURL(), DEFAULT_PRIORITY, NULL, NULL)) {
 356   }
 357
 358   void SetUp() override { request_->SetLoadFlags(0); }
 359
 360   void ExpectEntryAllowsAllOnErrorIfOptedOut(
 361       URLRequestThrottlerEntryInterface* entry,
 362       bool opted_out,
 363       const URLRequest& request) {
 364     EXPECT_FALSE(entry->ShouldRejectRequest(request,
 365                                             context_.network_delegate()));
 366     MockURLRequestThrottlerHeaderAdapter failure_adapter(503);
 367     for (int i = 0; i < 10; ++i) {
 368       // Host doesn't really matter in this scenario so we skip it.
 369       entry->UpdateWithResponse(std::string(), &failure_adapter);
 370     }
 371     EXPECT_NE(opted_out, entry->ShouldRejectRequest(
 372                   request, context_.network_delegate()));
 373
 374     if (opted_out) {
 375       // We're not mocking out GetTimeNow() in this scenario
 376       // so add a 100 ms buffer to avoid flakiness (that should always
 377       // give enough time to get from the TimeTicks::Now() call here
 378       // to the TimeTicks::Now() call in the entry class).
 379       EXPECT_GT(TimeTicks::Now() + TimeDelta::FromMilliseconds(100),
 380                 entry->GetExponentialBackoffReleaseTime());
 381     } else {
 382       // As above, add 100 ms.
 383       EXPECT_LT(TimeTicks::Now() + TimeDelta::FromMilliseconds(100),
 384                 entry->GetExponentialBackoffReleaseTime());
 385     }
 386   }
 387
 388   // context_ must be declared before request_.
 389   TestURLRequestContext context_;
 390   scoped_ptr<URLRequest> request_;
 391 };
 392
 393 TEST_F(URLRequestThrottlerManagerTest, IsUrlStandardised) {
 394   MockURLRequestThrottlerManager manager;
 395   GurlAndString test_values[] = {
 396       GurlAndString(GURL("http://www.example.com"),
 397                     std::string("http://www.example.com/"),
 398                     __LINE__),
 399       GurlAndString(GURL("http://www.Example.com"),
 400                     std::string("http://www.example.com/"),
 401                     __LINE__),
 402       GurlAndString(GURL("http://www.ex4mple.com/Pr4c71c41"),
 403                     std::string("http://www.ex4mple.com/pr4c71c41"),
 404                     __LINE__),
 405       GurlAndString(GURL("http://www.example.com/0/token/false"),
 406                     std::string("http://www.example.com/0/token/false"),
 407                     __LINE__),
 408       GurlAndString(GURL("http://www.example.com/index.php?code=javascript"),
 409                     std::string("http://www.example.com/index.php"),
 410                     __LINE__),
 411       GurlAndString(GURL("http://www.example.com/index.php?code=1#superEntry"),
 412                     std::string("http://www.example.com/index.php"),
 413                     __LINE__),
 414       GurlAndString(GURL("http://www.example.com/index.php#superEntry"),
 415                     std::string("http://www.example.com/index.php"),
 416                     __LINE__),
 417       GurlAndString(GURL("http://www.example.com:1234/"),
 418                     std::string("http://www.example.com:1234/"),
 419                     __LINE__)};
 420
 421   for (unsigned int i = 0; i < arraysize(test_values); ++i) {
 422     std::string temp = manager.DoGetUrlIdFromUrl(test_values[i].url);
 423     EXPECT_EQ(temp, test_values[i].result) <<
 424         "Test case #" << i << " line " << test_values[i].line << " failed";
 425   }
 426 }
 427
 428 TEST_F(URLRequestThrottlerManagerTest, AreEntriesBeingCollected) {
 429   MockURLRequestThrottlerManager manager;
 430
 431   manager.CreateEntry(true);  // true = Entry is outdated.
 432   manager.CreateEntry(true);
 433   manager.CreateEntry(true);
 434   manager.DoGarbageCollectEntries();
 435   EXPECT_EQ(0, manager.GetNumberOfEntries());
 436
 437   manager.CreateEntry(false);
 438   manager.CreateEntry(false);
 439   manager.CreateEntry(false);
 440   manager.CreateEntry(true);
 441   manager.DoGarbageCollectEntries();
 442   EXPECT_EQ(3, manager.GetNumberOfEntries());
 443 }
 444
 445 TEST_F(URLRequestThrottlerManagerTest, IsHostBeingRegistered) {
 446   MockURLRequestThrottlerManager manager;
 447
 448   manager.RegisterRequestUrl(GURL("http://www.example.com/"));
 449   manager.RegisterRequestUrl(GURL("http://www.google.com/"));
 450   manager.RegisterRequestUrl(GURL("http://www.google.com/index/0"));
 451   manager.RegisterRequestUrl(GURL("http://www.google.com/index/0?code=1"));
 452   manager.RegisterRequestUrl(GURL("http://www.google.com/index/0#lolsaure"));
 453
 454   EXPECT_EQ(3, manager.GetNumberOfEntries());
 455 }
 456
 457 TEST_F(URLRequestThrottlerManagerTest, OptOutHeader) {
 458   MockURLRequestThrottlerManager manager;
 459   scoped_refptr<URLRequestThrottlerEntryInterface> entry =
 460       manager.RegisterRequestUrl(GURL("http://www.google.com/yodude"));
 461
 462   // Fake a response with the opt-out header.
 463   MockURLRequestThrottlerHeaderAdapter response_adapter(
 464       std::string(),
 465       MockURLRequestThrottlerEntry::kExponentialThrottlingDisableValue,
 466       200);
 467   entry->UpdateWithResponse("www.google.com", &response_adapter);
 468
 469   // Ensure that the same entry on error always allows everything.
 470   ExpectEntryAllowsAllOnErrorIfOptedOut(entry.get(), true, *request_);
 471
 472   // Ensure that a freshly created entry (for a different URL on an
 473   // already opted-out host) also gets "always allow" behavior.
 474   scoped_refptr<URLRequestThrottlerEntryInterface> other_entry =
 475       manager.RegisterRequestUrl(GURL("http://www.google.com/bingobob"));
 476   ExpectEntryAllowsAllOnErrorIfOptedOut(other_entry.get(), true, *request_);
 477
 478   // Fake a response with the opt-out header incorrectly specified.
 479   scoped_refptr<URLRequestThrottlerEntryInterface> no_opt_out_entry =
 480       manager.RegisterRequestUrl(GURL("http://www.nike.com/justdoit"));
 481   MockURLRequestThrottlerHeaderAdapter wrong_adapter(
 482       std::string(), "yesplease", 200);
 483   no_opt_out_entry->UpdateWithResponse("www.nike.com", &wrong_adapter);
 484   ExpectEntryAllowsAllOnErrorIfOptedOut(
 485       no_opt_out_entry.get(), false, *request_);
 486
 487   // A localhost entry should always be opted out.
 488   scoped_refptr<URLRequestThrottlerEntryInterface> localhost_entry =
 489       manager.RegisterRequestUrl(GURL("http://localhost/hello"));
 490   ExpectEntryAllowsAllOnErrorIfOptedOut(localhost_entry.get(), true, *request_);
 491 }
 492
 493 TEST_F(URLRequestThrottlerManagerTest, ClearOnNetworkChange) {
 494   for (int i = 0; i < 3; ++i) {
 495     MockURLRequestThrottlerManager manager;
 496     scoped_refptr<URLRequestThrottlerEntryInterface> entry_before =
 497         manager.RegisterRequestUrl(GURL("http://www.example.com/"));
 498     MockURLRequestThrottlerHeaderAdapter failure_adapter(503);
 499     for (int j = 0; j < 10; ++j) {
 500       // Host doesn't really matter in this scenario so we skip it.
 501       entry_before->UpdateWithResponse(std::string(), &failure_adapter);
 502     }
 503     EXPECT_TRUE(entry_before->ShouldRejectRequest(*request_,
 504                                                   context_.network_delegate()));
 505
 506     switch (i) {
 507       case 0:
 508         manager.OnIPAddressChanged();
 509         break;
 510       case 1:
 511         manager.OnConnectionTypeChanged(
 512             NetworkChangeNotifier::CONNECTION_UNKNOWN);
 513         break;
 514       case 2:
 515         manager.OnConnectionTypeChanged(NetworkChangeNotifier::CONNECTION_NONE);
 516         break;
 517       default:
 518         FAIL();
 519     }
 520
 521     scoped_refptr<URLRequestThrottlerEntryInterface> entry_after =
 522         manager.RegisterRequestUrl(GURL("http://www.example.com/"));
 523     EXPECT_FALSE(entry_after->ShouldRejectRequest(
 524                      *request_, context_.network_delegate()));
 525   }
 526 }
 527
 528 }  // namespace net