37 lines
1.0 KiB
Go
37 lines
1.0 KiB
Go
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// Copyright 2013 The Go Authors. All rights reserved.
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//
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file or at
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// https://developers.google.com/open-source/licenses/bsd.
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package httputil
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import (
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"net/http"
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"github.com/prometheus/client_golang/internal/github.com/golang/gddo/httputil/header"
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)
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// NegotiateContentEncoding returns the best offered content encoding for the
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// request's Accept-Encoding header. If two offers match with equal weight and
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// then the offer earlier in the list is preferred. If no offers are
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// acceptable, then "" is returned.
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func NegotiateContentEncoding(r *http.Request, offers []string) string {
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bestOffer := "identity"
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bestQ := -1.0
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specs := header.ParseAccept(r.Header, "Accept-Encoding")
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for _, offer := range offers {
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for _, spec := range specs {
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if spec.Q > bestQ &&
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(spec.Value == "*" || spec.Value == offer) {
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bestQ = spec.Q
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bestOffer = offer
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}
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}
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}
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if bestQ == 0 {
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bestOffer = ""
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}
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return bestOffer
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}
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