Properly copy Request.uri and Request.postArgs

http.go

@@ -157,12 +157,13 @@ func (req *Request) CopyTo(dst *Request) {
 	dst.Reset()
 	req.Header.CopyTo(&dst.Header)
 	dst.body = append(dst.body[:0], req.body...)
-	if req.parsedURI {
-		dst.parseURI()
-	}
-	if req.parsedPostArgs {
-		dst.parsePostArgs()
-	}
+
+	req.uri.CopyTo(&dst.uri)
+	dst.parsedURI = req.parsedURI
+
+	req.postArgs.CopyTo(&dst.postArgs)
+	dst.parsedPostArgs = req.parsedPostArgs
+
 	// do not copy multipartForm - it will be automatically
 	// re-created on the first call to MultipartForm.
 }

uri.go

@@ -28,6 +28,7 @@ type URI struct {
 
 // CopyTo copies uri contents to dst.
 func (x *URI) CopyTo(dst *URI) {
+	dst.Reset()
 	dst.pathOriginal = append(dst.pathOriginal[:0], x.pathOriginal...)
 	dst.scheme = append(dst.scheme[:0], x.scheme...)
 	dst.path = append(dst.path[:0], x.path...)