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