openai: accept additional headers to fix CORS errors (#8343)

server/routes.go

@@ -1131,7 +1131,7 @@ func (s *Server) GenerateRoutes() http.Handler {
 	config.AllowWildcard = true
 	config.AllowBrowserExtensions = true
 	config.AllowHeaders = []string{"Authorization", "Content-Type", "User-Agent", "Accept", "X-Requested-With"}
-	openAIProperties := []string{"lang", "package-version", "os", "arch", "retry-count", "runtime", "runtime-version", "async"}
+	openAIProperties := []string{"lang", "package-version", "os", "arch", "retry-count", "runtime", "runtime-version", "async", "helper-method", "poll-helper", "custom-poll-interval"}
 	for _, prop := range openAIProperties {
 		config.AllowHeaders = append(config.AllowHeaders, "x-stainless-"+prop)
 	}