Moved data reduction proxy header processing out of net

BUG=367221

Review URL: https://codereview.chromium.org/318753005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@277314 0039d316-1c4b-4281-b951-d872f2087c98

5 files changed, 560 insertions, 5 deletions

diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_metrics.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_metrics.cc
index edc4820..7143f7c 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_metrics.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_metrics.cc
@@ -10,6 +10,7 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_settings.h"
+#include "components/data_reduction_proxy/common/data_reduction_proxy_headers.h"
 #include "components/data_reduction_proxy/common/data_reduction_proxy_pref_names.h"
 #include "net/base/host_port_pair.h"
 #include "net/http/http_response_headers.h"
@@ -355,7 +356,7 @@ DataReductionProxyRequestType GetDataReductionProxyRequestType(
       LONG_BYPASS : SHORT_BYPASS;
   }
   if (request->response_info().headers &&
-      request->response_info().headers->IsDataReductionProxyResponse()) {
+      HasDataReductionProxyViaHeader(request->response_info().headers)) {
     return VIA_DATA_REDUCTION_PROXY;
   }
   return UNKNOWN_TYPE;
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
index c050e40..53ece22 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.cc
@@ -7,6 +7,7 @@
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
+#include "components/data_reduction_proxy/common/data_reduction_proxy_headers.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
 #include "net/proxy/proxy_info.h"
@@ -54,11 +55,10 @@ bool MaybeBypassProxyAndPrepareToRetry(
   if (data_reduction_proxies.first.is_empty())
     return false;
 
-  net::HttpResponseHeaders::DataReductionProxyInfo data_reduction_proxy_info;
+  DataReductionProxyInfo data_reduction_proxy_info;
   net::ProxyService::DataReductionProxyBypassEventType bypass_type =
-      original_response_headers->GetDataReductionProxyBypassEventType(
-          &data_reduction_proxy_info);
-
+      GetDataReductionProxyBypassEventType(
+          original_response_headers, &data_reduction_proxy_info);
   if (bypass_type == net::ProxyService::BYPASS_EVENT_TYPE_MAX) {
     return false;
   }
diff --git a/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc b/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
new file mode 100644
index 0000000..773d14c
--- /dev/null
+++ b/components/data_reduction_proxy/common/data_reduction_proxy_headers.cc
@@ -0,0 +1,143 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/data_reduction_proxy/common/data_reduction_proxy_headers.h"
+
+#include <string>
+
+#include "base/strings/string_number_conversions.h"
+#include "base/strings/string_piece.h"
+#include "base/strings/string_util.h"
+#include "base/time/time.h"
+#include "net/http/http_response_headers.h"
+#include "net/http/http_status_code.h"
+#include "net/proxy/proxy_service.h"
+
+using base::StringPiece;
+using base::TimeDelta;
+using net::ProxyService;
+
+namespace data_reduction_proxy {
+
+bool GetDataReductionProxyBypassDuration(
+    const net::HttpResponseHeaders* headers,
+    const std::string& action_prefix,
+    base::TimeDelta* duration) {
+  void* iter = NULL;
+  std::string value;
+  std::string name = "chrome-proxy";
+
+  while (headers->EnumerateHeader(&iter, name, &value)) {
+    if (value.size() > action_prefix.size()) {
+      if (LowerCaseEqualsASCII(value.begin(),
+                               value.begin() + action_prefix.size(),
+                               action_prefix.c_str())) {
+        int64 seconds;
+        if (!base::StringToInt64(
+                StringPiece(value.begin() + action_prefix.size(), value.end()),
+                &seconds) || seconds < 0) {
+          continue;  // In case there is a well formed instruction.
+        }
+        *duration = TimeDelta::FromSeconds(seconds);
+        return true;
+      }
+    }
+  }
+  return false;
+}
+
+bool GetDataReductionProxyInfo(const net::HttpResponseHeaders* headers,
+                               DataReductionProxyInfo* proxy_info) {
+  DCHECK(proxy_info);
+  proxy_info->bypass_all = false;
+  proxy_info->bypass_duration = TimeDelta();
+  // Support header of the form Chrome-Proxy: bypass|block=<duration>, where
+  // <duration> is the number of seconds to wait before retrying
+  // the proxy. If the duration is 0, then the default proxy retry delay
+  // (specified in |ProxyList::UpdateRetryInfoOnFallback|) will be used.
+  // 'bypass' instructs Chrome to bypass the currently connected data reduction
+  // proxy, whereas 'block' instructs Chrome to bypass all available data
+  // reduction proxies.
+
+  // 'block' takes precedence over 'bypass', so look for it first.
+  // TODO(bengr): Reduce checks for 'block' and 'bypass' to a single loop.
+  if (GetDataReductionProxyBypassDuration(
+      headers, "block=", &proxy_info->bypass_duration)) {
+    proxy_info->bypass_all = true;
+    return true;
+  }
+
+  // Next, look for 'bypass'.
+  if (GetDataReductionProxyBypassDuration(
+      headers, "bypass=", &proxy_info->bypass_duration)) {
+    return true;
+  }
+  return false;
+}
+
+bool HasDataReductionProxyViaHeader(const net::HttpResponseHeaders* headers) {
+  const size_t kVersionSize = 4;
+  const char kDataReductionProxyViaValue[] = "Chrome-Compression-Proxy";
+  size_t value_len = strlen(kDataReductionProxyViaValue);
+  void* iter = NULL;
+  std::string value;
+
+  // Case-sensitive comparison of |value|. Assumes the received protocol and the
+  // space following it are always |kVersionSize| characters. E.g.,
+  // 'Via: 1.1 Chrome-Compression-Proxy'
+  while (headers->EnumerateHeader(&iter, "via", &value)) {
+    if (value.size() >= kVersionSize + value_len &&
+        !value.compare(kVersionSize, value_len, kDataReductionProxyViaValue))
+      return true;
+  }
+
+  // TODO(bengr): Remove deprecated header value.
+  const char kDeprecatedDataReductionProxyViaValue[] =
+      "1.1 Chrome Compression Proxy";
+  iter = NULL;
+  while (headers->EnumerateHeader(&iter, "via", &value))
+    if (value == kDeprecatedDataReductionProxyViaValue)
+      return true;
+
+  return false;
+}
+
+net::ProxyService::DataReductionProxyBypassEventType
+GetDataReductionProxyBypassEventType(
+    const net::HttpResponseHeaders* headers,
+    DataReductionProxyInfo* data_reduction_proxy_info) {
+  DCHECK(data_reduction_proxy_info);
+  if (GetDataReductionProxyInfo(headers, data_reduction_proxy_info)) {
+    // A chrome-proxy response header is only present in a 502. For proper
+    // reporting, this check must come before the 5xx checks below.
+    if (data_reduction_proxy_info->bypass_duration < TimeDelta::FromMinutes(30))
+      return ProxyService::SHORT_BYPASS;
+    return ProxyService::LONG_BYPASS;
+  }
+  if (headers->response_code() == net::HTTP_INTERNAL_SERVER_ERROR ||
+      headers->response_code() == net::HTTP_BAD_GATEWAY ||
+      headers->response_code() == net::HTTP_SERVICE_UNAVAILABLE) {
+    // Fall back if a 500, 502 or 503 is returned.
+    return ProxyService::INTERNAL_SERVER_ERROR_BYPASS;
+  }
+  if (!HasDataReductionProxyViaHeader(headers) &&
+      (headers->response_code() != net::HTTP_NOT_MODIFIED)) {
+    // A Via header might not be present in a 304. Since the goal of a 304
+    // response is to minimize information transfer, a sender in general
+    // should not generate representation metadata other than Cache-Control,
+    // Content-Location, Date, ETag, Expires, and Vary.
+
+    // The proxy Via header might also not be present in a 4xx response.
+    // Separate this case from other responses that are missing the header.
+    if (headers->response_code() >= net::HTTP_BAD_REQUEST &&
+        headers->response_code() < net::HTTP_INTERNAL_SERVER_ERROR) {
+      return ProxyService::PROXY_4XX_BYPASS;
+    }
+    return ProxyService::MISSING_VIA_HEADER;
+  }
+  // There is no bypass event.
+  return ProxyService::BYPASS_EVENT_TYPE_MAX;
+}
+
+}  // namespace data_reduction_proxy
diff --git a/components/data_reduction_proxy/common/data_reduction_proxy_headers.h b/components/data_reduction_proxy/common/data_reduction_proxy_headers.h
new file mode 100644
index 0000000..88b0cd0
--- /dev/null
+++ b/components/data_reduction_proxy/common/data_reduction_proxy_headers.h
@@ -0,0 +1,59 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_DATA_REDUCTION_PROXY_COMMON_DATA_REDUCTION_PROXY_HEADERS_H_
+#define COMPONENTS_DATA_REDUCTION_PROXY_COMMON_DATA_REDUCTION_PROXY_HEADERS_H_
+
+#include <string>
+
+#include "base/macros.h"
+#include "base/time/time.h"
+#include "net/http/http_response_headers.h"
+#include "net/proxy/proxy_service.h"
+
+namespace data_reduction_proxy {
+
+// Contains instructions contained in the Chrome-Proxy header.
+struct DataReductionProxyInfo {
+  DataReductionProxyInfo() : bypass_all(false) {}
+
+  // True if Chrome should bypass all available data reduction proxies. False
+  // if only the currently connected data reduction proxy should be bypassed.
+  bool bypass_all;
+
+  // Amount of time to bypass the data reduction proxy or proxies.
+  base::TimeDelta bypass_duration;
+};
+
+// Returns true if the Chrome-Proxy header is present and contains a bypass
+// delay. Sets |proxy_info->bypass_duration| to the specified delay if greater
+// than 0, and to 0 otherwise to indicate that the default proxy delay
+// (as specified in |ProxyList::UpdateRetryInfoOnFallback|) should be used.
+// If all available data reduction proxies should by bypassed, |bypass_all| is
+// set to true. |proxy_info| must be non-NULL.
+bool GetDataReductionProxyInfo(
+    const net::HttpResponseHeaders* headers,
+    DataReductionProxyInfo* proxy_info);
+
+// Returns true if the response contain the data reduction proxy Via header
+// value. Used to check the integrity of data reduction proxy responses.
+bool HasDataReductionProxyViaHeader(const net::HttpResponseHeaders* headers);
+
+// Returns the reason why the Chrome proxy should be bypassed or not, and
+// populates |proxy_info| with information on how long to bypass if
+// applicable.
+net::ProxyService::DataReductionProxyBypassEventType
+GetDataReductionProxyBypassEventType(
+    const net::HttpResponseHeaders* headers,
+    DataReductionProxyInfo* proxy_info);
+
+// Searches for the specified Chrome-Proxy action, and if present interprets
+// its value as a duration in seconds.
+bool GetDataReductionProxyBypassDuration(
+    const net::HttpResponseHeaders* headers,
+    const std::string& action_prefix,
+    base::TimeDelta* duration);
+
+}  // namespace data_reduction_proxy
+#endif  // COMPONENTS_DATA_REDUCTION_PROXY_COMMON_DATA_REDUCTION_PROXY_HEADERS_H_
diff --git a/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc b/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
new file mode 100644
index 0000000..871d665
--- /dev/null
+++ b/components/data_reduction_proxy/common/data_reduction_proxy_headers_unittest.cc
@@ -0,0 +1,352 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/data_reduction_proxy/common/data_reduction_proxy_headers.h"
+
+#include "net/http/http_response_headers.h"
+#include "net/proxy/proxy_service.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+// Transform "normal"-looking headers (\n-separated) to the appropriate
+// input format for ParseRawHeaders (\0-separated).
+void HeadersToRaw(std::string* headers) {
+  std::replace(headers->begin(), headers->end(), '\n', '\0');
+  if (!headers->empty())
+    *headers += '\0';
+}
+
+}  // namespace
+
+namespace data_reduction_proxy {
+
+class DataReductionProxyHeadersTest : public testing::Test {};
+
+TEST_F(DataReductionProxyHeadersTest, GetProxyBypassInfo) {
+  const struct {
+     const char* headers;
+     bool expected_result;
+     int64 expected_retry_delay;
+     bool expected_bypass_all;
+  } tests[] = {
+    { "HTTP/1.1 200 OK\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=0\n"
+      "Content-Length: 999\n",
+      true,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=-1\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=xyz\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: foo=abc, bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=86400, bar=abc\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=3600\n"
+      "Chrome-Proxy: bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      3600,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=3600, bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      3600,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=, bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass\n"
+      "Chrome-Proxy: bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: block=, block=3600\n"
+      "Content-Length: 999\n",
+      true,
+      3600,
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: keep-alive\n"
+      "Chrome-Proxy: bypass=86400, block=3600\n"
+      "Content-Length: 999\n",
+      true,
+      3600,
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: proxy-bypass\n"
+      "Chrome-Proxy: block=, bypass=86400\n"
+      "Content-Length: 999\n",
+      true,
+      86400,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: proxy-bypass\n"
+      "Chrome-Proxy: block=-1\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "connection: proxy-bypass\n"
+      "Chrome-Proxy: block=99999999999999999999\n"
+      "Content-Length: 999\n",
+      false,
+      0,
+      false,
+    },
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    std::string headers(tests[i].headers);
+    HeadersToRaw(&headers);
+    scoped_refptr<net::HttpResponseHeaders> parsed(
+        new net::HttpResponseHeaders(headers));
+
+    DataReductionProxyInfo data_reduction_proxy_info;
+    EXPECT_EQ(tests[i].expected_result,
+              GetDataReductionProxyInfo(parsed, &data_reduction_proxy_info));
+    EXPECT_EQ(tests[i].expected_retry_delay,
+              data_reduction_proxy_info.bypass_duration.InSeconds());
+    EXPECT_EQ(tests[i].expected_bypass_all,
+              data_reduction_proxy_info.bypass_all);
+  }
+}
+
+TEST_F(DataReductionProxyHeadersTest, HasDataReductionProxyViaHeader) {
+  const struct {
+     const char* headers;
+     bool expected_result;
+  } tests[] = {
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome-Proxy\n",
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1\n",
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.0 Chrome-Compression-Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Foo-Bar, 1.1 Chrome-Compression-Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome-Compression-Proxy, 1.1 Bar-Foo\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 chrome-compression-proxy\n",
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Foo-Bar\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome-Proxy\n",
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome Compression Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Foo-Bar, 1.1 Chrome Compression Proxy\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Chrome Compression Proxy, 1.1 Bar-Foo\n",
+      true,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 chrome compression proxy\n",
+      false,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Via: 1.1 Foo-Bar\n"
+      "Via: 1.1 Chrome Compression Proxy\n",
+      true,
+    },
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    std::string headers(tests[i].headers);
+    HeadersToRaw(&headers);
+    scoped_refptr<net::HttpResponseHeaders> parsed(
+        new net::HttpResponseHeaders(headers));
+
+    EXPECT_EQ(tests[i].expected_result,
+              HasDataReductionProxyViaHeader(parsed));
+  }
+}
+
+TEST_F(DataReductionProxyHeadersTest, GetDataReductionProxyBypassEventType) {
+  const struct {
+     const char* headers;
+     net::ProxyService::DataReductionProxyBypassEventType expected_result;
+  } tests[] = {
+    { "HTTP/1.1 200 OK\n"
+      "Chrome-Proxy: bypass=0\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::SHORT_BYPASS,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Chrome-Proxy: bypass=1799\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::SHORT_BYPASS,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Chrome-Proxy: bypass=1800\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::LONG_BYPASS,
+    },
+    { "HTTP/1.1 500 Internal Server Error\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::INTERNAL_SERVER_ERROR_BYPASS,
+    },
+    { "HTTP/1.1 501 Not Implemented\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::BYPASS_EVENT_TYPE_MAX,
+    },
+    { "HTTP/1.1 502 Bad Gateway\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::INTERNAL_SERVER_ERROR_BYPASS,
+    },
+    { "HTTP/1.1 503 Service Unavailable\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::INTERNAL_SERVER_ERROR_BYPASS,
+    },
+    { "HTTP/1.1 504 Gateway Timeout\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::BYPASS_EVENT_TYPE_MAX,
+    },
+    { "HTTP/1.1 505 HTTP Version Not Supported\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::BYPASS_EVENT_TYPE_MAX,
+    },
+    { "HTTP/1.1 304 Not Modified\n",
+        net::ProxyService::BYPASS_EVENT_TYPE_MAX,
+    },
+    { "HTTP/1.1 200 OK\n",
+        net::ProxyService::MISSING_VIA_HEADER,
+    },
+    { "HTTP/1.1 200 OK\n"
+      "Chrome-Proxy: bypass=1799\n",
+      net::ProxyService::SHORT_BYPASS,
+    },
+    { "HTTP/1.1 502 Bad Gateway\n",
+      net::ProxyService::INTERNAL_SERVER_ERROR_BYPASS,
+    },
+    { "HTTP/1.1 502 Bad Gateway\n"
+      "Chrome-Proxy: bypass=1799\n",
+      net::ProxyService::SHORT_BYPASS,
+    },
+    { "HTTP/1.1 502 Bad Gateway\n"
+      "Chrome-Proxy: bypass=1799\n",
+      net::ProxyService::SHORT_BYPASS,
+    },
+    { "HTTP/1.1 414 Request-URI Too Long\n",
+      net::ProxyService::PROXY_4XX_BYPASS,
+    },
+    { "HTTP/1.1 414 Request-URI Too Long\n"
+      "Via: 1.1 Chrome-Compression-Proxy\n",
+      net::ProxyService::BYPASS_EVENT_TYPE_MAX,
+    }
+  };
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(tests); ++i) {
+    std::string headers(tests[i].headers);
+    HeadersToRaw(&headers);
+    scoped_refptr<net::HttpResponseHeaders> parsed(
+        new net::HttpResponseHeaders(headers));
+    DataReductionProxyInfo chrome_proxy_info;
+    EXPECT_EQ(tests[i].expected_result,
+              GetDataReductionProxyBypassEventType(parsed, &chrome_proxy_info));
+  }
+}
+}  // namespace data_reduction_proxy