chromium/net/http/http_vary_data.h

// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_HTTP_HTTP_VARY_DATA_H_
#define NET_HTTP_HTTP_VARY_DATA_H_

#include "base/hash/md5.h"
#include "net/base/net_export.h"

namespace base {
class Pickle;
class PickleIterator;
}

namespace net {

struct HttpRequestInfo;
class HttpResponseHeaders;

// Used to implement the HTTP/1.1 Vary header.  This class contains a MD5 hash
// over the request headers indicated by a Vary header.
//
// While RFC 2616 requires strict request header comparisons, it is much
// cheaper to store a MD5 sum, which should be sufficient.  Storing a hash also
// avoids messy privacy issues as some of the request headers could hold
// sensitive data (e.g., cookies).
//
// NOTE: This class does not hold onto the contents of the Vary header.
// Instead, it relies on the consumer to store that and to supply it again to
// the MatchesRequest function for comparing against future HTTP requests.
//
class NET_EXPORT_PRIVATE HttpVaryData { … };

}  // namespace net

#endif  // NET_HTTP_HTTP_VARY_DATA_H_