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