[HELP WANTED] How to use serverpush with Gin?

[mgtest42]

I'm trying to implement Server Push.
I've taken the code from this blog post: https://blog.golang.org/h2push

pusher, ok := ctx.Writer.(http.Pusher)
if ok {
	log.Println("Push ok")
	pusher.Push("/img/logo.png", nil)
} else {
	log.Println("push not ok")
}		

Where ctx - *gin.Context
It returns "push not ok". Original example works in my browser.
Any ideas? Or any way to get original http.ResponseWriter from gin.Context?
Of course, there is https and browser shows h2 protocol.

[htobenothing]

ctx.Writer is not a simple http.ResponseWriter, so I modify the ResponseWriter interface , add Pusher() function to get http.Pusher

type ResponseWriter interface {
	http.ResponseWriter
	http.Hijacker
	http.Flusher
	http.CloseNotifier

	// Returns the HTTP response status code of the current request.
	Status() int

	// Returns the number of bytes already written into the response http body.
	// See Written()
	Size() int

	// Writes the string into the response body.
	WriteString(string) (int, error)

	// Returns true if the response body was already written.
	Written() bool

	// Forces to write the http header (status code + headers).
	WriteHeaderNow()

	// return http.Pusher if support http2 push
	Pusher() http.Pusher
}

func (w *responseWriter) Pusher() http.Pusher {
	if pusher, ok := w.ResponseWriter.(http.ResponseWriter).(http.Pusher); ok {
		return pusher
	}
	return nil
}


//  in the api 
router.GET("/pusher", func(c *gin.Context) {
       if pusher := c.Writer.Pusher(); pusher != nil {
          // use pusher.Push() to push 
       }
}

[dreambo8563]

@htobenothing , could you pls provide a demo case, I use your solution locally, but it seems the push is not working. the file I pushed will be "GET" again by my index.html

[appleboy]

See #1273 PR

[appleboy]

Please update the latest code.