Only canonicalize header key once in each iteration (#1565)

grpc-ecosystem · Aug 1, 2020 · db30ebe · db30ebe
1 parent fcda45e
commit db30ebe
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/runtime/context.go b/runtime/context.go
@@ -96,8 +96,8 @@ func annotateContext(ctx context.Context, mux *ServeMux, req *http.Request, rpcM
 	}
 
 	for key, vals := range req.Header {
+		key = textproto.CanonicalMIMEHeaderKey(key)
 		for _, val := range vals {
-			key = textproto.CanonicalMIMEHeaderKey(key)
 			// For backwards-compatibility, pass through 'authorization' header with no prefix.
 			if key == "Authorization" {
 				pairs = append(pairs, "authorization", val)