Method ServeHTTP

api/rpc/http.go:177–200

ServeHTTP serves JSON-RPC requests over HTTP.

(w http.ResponseWriter, r *http.Request)

// ServeHTTP serves JSON-RPC requests over HTTP.
func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	// Permit dumb empty requests for remote health-checks (AWS)
	if r.Method == http.MethodGet && r.ContentLength == 0 && r.URL.RawQuery == "" {
		return
	}
	if code, err := validateRequest(r); err != nil {
		http.Error(w, err.Error(), code)
		return
	}
	// All checks passed, create a codec that reads direct from the request body
	// untilEOF and writes the response to w and order the server to process a
	// single request.
	ctx := r.Context()
	ctx = context.WithValue(ctx, "remote", r.RemoteAddr)
	ctx = context.WithValue(ctx, "scheme", r.Proto)
	ctx = context.WithValue(ctx, "local", r.Host)

	body := io.LimitReader(r.Body, maxRequestContentLength)
	codec := NewJSONCodec(&httpReadWriteNopCloser{body, w})
	defer codec.Close()

	w.Header().Set("content-type", contentType)
	srv.ServeSingleRequest(ctx, codec, OptionMethodInvocation)
}

// validateRequest returns a non-zero response code and error message if the
// request is invalid.