fix: Bypass the response body processing in ai-proxy if it is returned internally (#1149)

plugins/wasm-go/pkg/wrapper/response_wrapper.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2022 Alibaba Group Holding Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//	http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package wrapper
+
+import (
+	"github.com/higress-group/proxy-wasm-go-sdk/proxywasm"
+)
+
+func IsResponseFromUpstream() bool {
+	if codeDetails, err := proxywasm.GetProperty([]string{"response", "code_details"}); err == nil {
+		return string(codeDetails) == "via_upstream"
+	} else {
+		proxywasm.LogErrorf("get response code details failed: %v", err)
+		return false
+	}
+}