Only canonicalize header key once in each iteration (#1564)

grpc-ecosystem · Jul 31, 2020 · 3c7c499 · 3c7c499
1 parent 2b269c6
commit 3c7c499
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/runtime/context.go b/runtime/context.go
@@ -93,8 +93,8 @@ func annotateContext(ctx context.Context, mux *ServeMux, req *http.Request) (con
  }
 
  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)