46 lines
1,008 B
Go
46 lines
1,008 B
Go
package connectionheader
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import (
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"net/http"
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"net/textproto"
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"strings"
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"golang.org/x/net/http/httpguts"
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)
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const (
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connectionHeader = "Connection"
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upgradeHeader = "Upgrade"
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)
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// Remover removes hop-by-hop headers listed in the "Connection" header.
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// See RFC 7230, section 6.1.
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func Remover(next http.Handler) http.HandlerFunc {
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return func(rw http.ResponseWriter, req *http.Request) {
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var reqUpType string
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if httpguts.HeaderValuesContainsToken(req.Header[connectionHeader], upgradeHeader) {
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reqUpType = req.Header.Get(upgradeHeader)
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}
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removeConnectionHeaders(req.Header)
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if reqUpType != "" {
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req.Header.Set(connectionHeader, upgradeHeader)
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req.Header.Set(upgradeHeader, reqUpType)
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} else {
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req.Header.Del(connectionHeader)
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}
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next.ServeHTTP(rw, req)
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}
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}
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func removeConnectionHeaders(h http.Header) {
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for _, f := range h[connectionHeader] {
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for _, sf := range strings.Split(f, ",") {
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if sf = textproto.TrimString(sf); sf != "" {
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h.Del(sf)
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}
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}
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}
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}
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