feat: add http header handler (#1461)

transport/http/server.go

@@ -168,6 +168,11 @@ func (s *Server) HandleFunc(path string, h http.HandlerFunc) {
 	s.router.HandleFunc(path, h)
 }
 
+// HandleHeader registers a new route with a matcher for the header.
+func (s *Server) HandleHeader(key, val string, h http.HandlerFunc) {
+	s.router.Headers(key, val).Handler(h)
+}
+
 // ServeHTTP should write reply headers and data to the ResponseWriter and then return.
 func (s *Server) ServeHTTP(res http.ResponseWriter, req *http.Request) {
 	s.Handler.ServeHTTP(res, req)