panic safe type conversion

tohttp.go

@@ -1,16 +1,26 @@
 package http2util
 
 import (
+	"fmt"
 	"net/http"
 
 	"golang.org/x/net/http2"
 )
 
-// Frame2HTTPRequest
-func FrameToHTTPRequest(f *http2.MetaHeadersFrame) (*http.Request, error) {
+// Frame2HTTPRequest creates http.Request from frame
+func FrameToHTTPRequest(frame http2.Frame) (*http.Request, error) {
+	f, ok := frame.(*http2.MetaHeadersFrame)
+	if !ok {
+		return nil, fmt.Errorf("error: only http2.MetaHeadersFrame is supported")
+	}
 	return processMetaHeadersForRequest(f)
 }
 
-func FrameToHTTPResponse(f *http2.MetaHeadersFrame) (*http.Response, error) {
+// FrameToHTTPResponse creates http.Response from frame
+func FrameToHTTPResponse(frame http2.Frame) (*http.Response, error) {
+	f, ok := frame.(*http2.MetaHeadersFrame)
+	if !ok {
+		return nil, fmt.Errorf("error: only http2.MetaHeadersFrame is supported")
+	}
 	return processMetaHeadersForResponse(f)
 }