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// Copyright 2022 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_ALTERNATE_PROTOCOL_USAGE_H_
#define NET_HTTP_ALTERNATE_PROTOCOL_USAGE_H_
namespace net {
// The reason why Chrome uses a specific transport protocol for HTTP semantics.
enum AlternateProtocolUsage {
// Alternate Protocol was used without racing a normal connection.
ALTERNATE_PROTOCOL_USAGE_NO_RACE = 0,
// Alternate Protocol was used by winning a race with a normal connection.
ALTERNATE_PROTOCOL_USAGE_WON_RACE = 1,
// Alternate Protocol was not used by losing a race with a normal connection.
ALTERNATE_PROTOCOL_USAGE_MAIN_JOB_WON_RACE = 2,
// Alternate Protocol was not used because no Alternate-Protocol information
// was available when the request was issued, but an Alternate-Protocol header
// was present in the response.
ALTERNATE_PROTOCOL_USAGE_MAPPING_MISSING = 3,
// Alternate Protocol was not used because it was marked broken.
ALTERNATE_PROTOCOL_USAGE_BROKEN = 4,
// HTTPS DNS protocol upgrade job was used without racing with a normal
// connection and an Alternate Protocol job.
ALTERNATE_PROTOCOL_USAGE_DNS_ALPN_H3_JOB_WON_WITHOUT_RACE = 5,
// HTTPS DNS protocol upgrade job won a race with a normal connection and
// an Alternate Protocol job.
ALTERNATE_PROTOCOL_USAGE_DNS_ALPN_H3_JOB_WON_RACE = 6,
// This value is used when the reason is unknown and also used as the default
// value.
ALTERNATE_PROTOCOL_USAGE_UNSPECIFIED_REASON = 7,
// Maximum value for the enum.
ALTERNATE_PROTOCOL_USAGE_MAX,
};
} // namespace net
#endif // NET_HTTP_ALTERNATE_PROTOCOL_USAGE_H_
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