44 строки
1.0 KiB
Go
44 строки
1.0 KiB
Go
// +build go1.8
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package gziphandler
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import "net/http"
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// Push initiates an HTTP/2 server push.
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// Push returns ErrNotSupported if the client has disabled push or if push
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// is not supported on the underlying connection.
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func (w *GzipResponseWriter) Push(target string, opts *http.PushOptions) error {
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pusher, ok := w.ResponseWriter.(http.Pusher)
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if ok && pusher != nil {
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return pusher.Push(target, setAcceptEncodingForPushOptions(opts))
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}
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return http.ErrNotSupported
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}
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// setAcceptEncodingForPushOptions sets "Accept-Encoding" : "gzip" for PushOptions without overriding existing headers.
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func setAcceptEncodingForPushOptions(opts *http.PushOptions) *http.PushOptions {
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if opts == nil {
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opts = &http.PushOptions{
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Header: http.Header{
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acceptEncoding: []string{"gzip"},
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},
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}
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return opts
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}
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if opts.Header == nil {
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opts.Header = http.Header{
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acceptEncoding: []string{"gzip"},
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}
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return opts
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}
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if encoding := opts.Header.Get(acceptEncoding); encoding == "" {
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opts.Header.Add(acceptEncoding, "gzip")
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return opts
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}
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return opts
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}
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