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// Copyright 2019 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 "chrome/renderer/subresource_redirect/subresource_redirect_url_loader_throttle.h"
#include "base/metrics/histogram_macros.h"
#include "chrome/renderer/subresource_redirect/subresource_redirect_experiments.h"
#include "chrome/renderer/subresource_redirect/subresource_redirect_util.h"
#include "components/data_reduction_proxy/core/common/data_reduction_proxy_headers.h"
#include "content/public/common/resource_type.h"
#include "net/base/escape.h"
#include "net/base/load_flags.h"
#include "net/http/http_status_code.h"
#include "services/network/public/cpp/resource_response.h"
namespace subresource_redirect {
SubresourceRedirectURLLoaderThrottle::SubresourceRedirectURLLoaderThrottle() =
default;
SubresourceRedirectURLLoaderThrottle::~SubresourceRedirectURLLoaderThrottle() =
default;
void SubresourceRedirectURLLoaderThrottle::WillStartRequest(
network::ResourceRequest* request,
bool* defer) {
DCHECK_EQ(request->resource_type,
static_cast<int>(content::ResourceType::kImage));
DCHECK(request->url.SchemeIs(url::kHttpsScheme));
// Image subresources that have paths that do not end in one of the
// following common formats are commonly single pixel images that will not
// benefit from being sent to the compression server.
if (!ShouldIncludeMediaSuffix(request->url))
return;
request->url = GetSubresourceURLForURL(request->url);
*defer = false;
}
void SubresourceRedirectURLLoaderThrottle::WillRedirectRequest(
net::RedirectInfo* redirect_info,
const network::ResourceResponseHead& response_head,
bool* defer,
std::vector<std::string>* to_be_removed_request_headers,
net::HttpRequestHeaders* modified_request_headers) {
UMA_HISTOGRAM_ENUMERATION(
"SubresourceRedirect.CompressionAttempt.ResponseCode",
static_cast<net::HttpStatusCode>(response_head.headers->response_code()),
net::HTTP_VERSION_NOT_SUPPORTED);
}
void SubresourceRedirectURLLoaderThrottle::BeforeWillProcessResponse(
const GURL& response_url,
const network::ResourceResponseHead& response_head,
bool* defer) {
// If response was not from the compression server, don't restart it.
if (!response_url.is_valid())
return;
GURL compression_server = GetLitePageSubresourceDomainURL();
if (!response_url.DomainIs(compression_server.host()))
return;
if (response_url.EffectiveIntPort() != compression_server.EffectiveIntPort())
return;
if (response_url.scheme() != compression_server.scheme())
return;
// Log all response codes, from the compression server.
UMA_HISTOGRAM_ENUMERATION(
"SubresourceRedirect.CompressionAttempt.ResponseCode",
static_cast<net::HttpStatusCode>(response_head.headers->response_code()),
net::HTTP_VERSION_NOT_SUPPORTED);
// Do nothing with 2XX responses, as these requests were handled
// correctly by the compression server.
if ((response_head.headers->response_code() >= 200 &&
response_head.headers->response_code() <= 299) ||
response_head.headers->response_code() == 304) {
return;
}
// Non 2XX responses from the compression server need to have unaltered
// requests sent to the original resource.
delegate_->RestartWithURLResetAndFlags(net::LOAD_NORMAL);
}
void SubresourceRedirectURLLoaderThrottle::WillProcessResponse(
const GURL& response_url,
network::ResourceResponseHead* response_head,
bool* defer) {
// If response was not from the compression server, don't record any metrics.
if (!response_url.is_valid())
return;
GURL compression_server = GetLitePageSubresourceDomainURL();
if (!response_url.DomainIs(compression_server.host()))
return;
if (response_url.EffectiveIntPort() != compression_server.EffectiveIntPort())
return;
if (response_url.scheme() != compression_server.scheme())
return;
// Record that the server responded.
UMA_HISTOGRAM_BOOLEAN(
"SubresourceRedirect.CompressionAttempt.ServerResponded", true);
// If compression was unsuccessful don't try and record compression percent.
if (response_head->headers->response_code() != 200)
return;
float content_length =
static_cast<float>(response_head->headers->GetContentLength());
float ofcl =
static_cast<float>(data_reduction_proxy::GetDataReductionProxyOFCL(
response_head->headers.get()));
// If either |content_length| or |ofcl| are missing don't compute compression
// percent.
if (content_length < 0.0 || ofcl <= 0.0)
return;
UMA_HISTOGRAM_PERCENTAGE(
"SubresourceRedirect.DidCompress.CompressionPercent",
static_cast<int>(100 - ((content_length / ofcl) * 100)));
UMA_HISTOGRAM_COUNTS_1M("SubresourceRedirect.DidCompress.BytesSaved",
static_cast<int>(ofcl - content_length));
}
void SubresourceRedirectURLLoaderThrottle::WillOnCompleteWithError(
const network::URLLoaderCompletionStatus& status,
bool* defer) {
// If the server fails, restart the request to the original resource, and
// record it.
delegate_->RestartWithURLResetAndFlags(net::LOAD_NORMAL);
UMA_HISTOGRAM_BOOLEAN(
"SubresourceRedirect.CompressionAttempt.ServerResponded", false);
}
void SubresourceRedirectURLLoaderThrottle::DetachFromCurrentSequence() {}
} // namespace subresource_redirect
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