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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() {
net::URLRequest::RegisterRequestInterceptor(this);
}
ConnectInterceptor::~ConnectInterceptor() {
net::URLRequest::UnregisterRequestInterceptor(this);
}
net::URLRequestJob* ConnectInterceptor::MaybeIntercept(
net::URLRequest* request) {
GURL request_scheme_host(request->url().GetWithEmptyPath());
// Learn what URLs are likely to be needed during next startup.
LearnAboutInitialNavigation(request_scheme_host);
bool redirected_host = false;
if (request->referrer().empty()) {
if (request->url() != request->original_url()) {
// This request was completed with a redirect.
GURL original_scheme_host(request->original_url().GetWithEmptyPath());
if (request_scheme_host != original_scheme_host) {
redirected_host = true;
// Don't learn from redirects that take path as an argument, but do
// learn from short-hand typing entries, such as "cnn.com" redirects to
// "www.cnn.com". We can't just check for has_path(), as a mere "/"
// will count as a path, so we check that the path is at most a "/"
// (1 character long) to decide the redirect is "definitive" and has no
// significant path.
// TODO(jar): It may be ok to learn from all redirects, as the adaptive
// system will not respond until several identical redirects have taken
// place. Hence a use of a path (that changes) wouldn't really be
// learned from anyway.
if (request->original_url().path().length() <= 1) {
// TODO(jar): These definite redirects could be learned much faster.
LearnFromNavigation(original_scheme_host, request_scheme_host);
}
}
}
} else {
GURL referring_scheme_host = GURL(request->referrer()).GetWithEmptyPath();
if (referring_scheme_host == request_scheme_host) {
// 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 host, 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;
}
bool is_subresource = !(request->load_flags() & net::LOAD_MAIN_FRAME);
// Learn about our referring URL, for use in the future.
if (is_subresource)
LearnFromNavigation(referring_scheme_host, request_scheme_host);
}
// Subresources for main frames usually get predicted when we detected the
// main frame request - way back in RenderViewHost::Navigate. So only handle
// predictions now for subresources or for redirected hosts.
if ((request->load_flags() & net::LOAD_SUB_FRAME) || redirected_host)
PredictFrameSubresources(request_scheme_host);
return NULL;
}
net::URLRequestJob* ConnectInterceptor::MaybeInterceptResponse(
net::URLRequest* request) {
return NULL;
}
net::URLRequestJob* ConnectInterceptor::MaybeInterceptRedirect(
net::URLRequest* request,
const GURL& location) {
return NULL;
}
} // namespace chrome_browser_net
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