fix adapter support http2

[pedia]

Since the adapter hardcode HTTP/1.1:

	r.Proto = "HTTP/1.1"
	r.ProtoMajor = 1

Maybe this is better?

	r.Proto = b2s(ctx.Request.Header.Protocol())
	if r.Proto == "HTTP/2" {
		r.ProtoMajor = 2
	} else {
		r.ProtoMajor = 1
	}

With this change, compose fasthttp and grpc together is possible.

Usage:

// start server
ws := &fasthttp.Server{...}
http2.ConfigureServer(ws)
ws.ServeTLS(...)

// transform to grpc request
if bytes.Equal(ctx.Request.Header.ContentType(), grpcContentType) {
    fh := fasthttpadaptor.NewFastHTTPHandler(a.Rpc)
    fh(ctx)
    return
}

[li-jin-gou]

I don't think adding this logic to the adapter will adapt to H2, because the protocols for both H2 and H1 are different, and currently fasthttp only does H1 in terms of protocol handling.

[pedia]

Agree, This is a small step.

[erikdubbelboer]

How would this work? In your example you use http2.ConfigureServer(ws) but http2.ConfigureServer expects a http.Server as argument, not a fasthttp.Server.

A fasthttp server isn't be able to receive HTTP/2 requests, so how would that fasthttp.RequestCtx with a Proto of HTTP/2 ever be created?

[pedia]

in http2.ConfigureServer(ws), http2 come from https://github.com/dgrr/http2

I think http2.ConfigureServer patched a little.

Testing with curl --http2, it passed.

[erikdubbelboer]

Thanks!