mirror of
https://github.com/caddyserver/caddy.git
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54 lines
1.6 KiB
Go
54 lines
1.6 KiB
Go
// Copyright 2015 Matthew Holt and The Caddy Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package caddyhttp
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import (
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"net/http"
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"github.com/dunglas/httpsfv"
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)
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// incrementalHeader is the HTTP field with which a sender asks intermediaries
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// to start forwarding a message before it has been received in full.
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// See RFC 10036: https://www.rfc-editor.org/rfc/rfc10036.html
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const incrementalHeader = "Incremental"
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// IsIncremental returns true if hdr requests incremental forwarding of the
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// message it belongs to. The field applies to a single message, so a
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// request and its response have to carry it independently.
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func IsIncremental(hdr http.Header) bool {
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vals := hdr.Values(incrementalHeader)
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if len(vals) == 0 {
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return false
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}
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// every sender serializes true this way, and parsing it costs
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// ~3x more time and two allocations
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if len(vals) == 1 && vals[0] == "?1" {
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return true
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}
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item, err := httpsfv.UnmarshalItem(vals)
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if err != nil {
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return false
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}
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// only a Boolean is valid; any other type is ignored, as are
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// parameters we don't know about
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b, ok := item.Value.(bool)
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return ok && b
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}
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