diff --git a/server.go b/server.go
index f2caa39..c28e671 100644
--- a/server.go
+++ b/server.go
@@ -169,7 +169,11 @@ func NewHTTPServerWithPort(serveMux ServerMuxInterface, port int) *Server {
 	registUnhandledPattern(serveMux)
 
 	server := &Server{
-		httpserver: &http.Server{Addr: addr, Handler: serveMux},
+		httpserver: &http.Server{
+			Addr:           addr,
+			Handler:        serveMux,
+			MaxHeaderBytes: 2 << 20, // 2 MB
+		},
 	}
 	server.httpserver.SetKeepAlivesEnabled(true)