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// Copyright (c) 2010 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/browser/net/connect_interceptor.h"
#include "chrome/browser/net/predictor_api.h"
#include "net/base/load_flags.h"
namespace chrome_browser_net {
ConnectInterceptor::ConnectInterceptor() {
URLRequest::RegisterRequestInterceptor(this);
}
ConnectInterceptor::~ConnectInterceptor() {
URLRequest::UnregisterRequestInterceptor(this);
}
URLRequestJob* ConnectInterceptor::MaybeIntercept(URLRequest* request) {
// Learn what URLs are likely to be needed during next startup.
// Pass actual URL, rather than WithEmptyPath, as we often won't need to do
// the canonicalization.
LearnAboutInitialNavigation(request->url());
bool is_subresource = !(request->load_flags() & net::LOAD_MAIN_FRAME);
if (is_subresource && !request->referrer().empty()) {
// Learn about our referring URL, for use in the future.
GURL referring_url(GURL(request->referrer()).GetWithEmptyPath());
GURL request_url(request->url().GetWithEmptyPath());
if (referring_url == request_url) {
// There is nothing to learn about preconnections when the referrer is
// already the site needed in the request URL. Similarly, we've already
// made any/all predictions when we navigated to the referring_url, so we
// can bail out here. This will also avoid useless boosting of the number
// of times we navigated to this site, which was already accounted for by
// the navigation to the referrering_url.
return NULL;
}
LearnFromNavigation(referring_url, request_url);
}
// Subresources for main frames usually get loaded when we detected the main
// frame - way back in RenderViewHost::Navigate. So only use subresource
// prediction here for subframes.
if (request->load_flags() & net::LOAD_SUB_FRAME)
PredictFrameSubresources(request->url().GetWithEmptyPath());
return NULL;
}
URLRequestJob* ConnectInterceptor::MaybeInterceptResponse(URLRequest* request) {
return NULL;
}
URLRequestJob* ConnectInterceptor::MaybeInterceptRedirect(
URLRequest* request,
const GURL& location) {
return NULL;
}
} // namespace chrome_browser_net
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