英文:
Transfer-encoding chunked in golang proxy
问题
我是你的中文翻译助手，以下是翻译好的内容：
我是golang的新手，正在尝试构建一个小型的本地代理。请求从Postman -> localhost:9097 -> localhost:9098 和返回都基本正常。但是响应的内容长度是120，而响应体却是一些无意义的字符。
我期望得到的是一个json格式的响应体，类似于 { "result": { "id": "1", "price": 100, "quantity": 1 } }。
如果我直接请求 :9098，我发现响应头中的 transfer-encoding 是 chunked。你有什么办法可以调整我的代码，以正确解析服务器的响应体并将其发送回客户端吗？
func httpHandler(w http.ResponseWriter, req *http.Request) {
reqURL := fmt.Sprint(req.URL)
newUrl = "http://localhost:9098" + reqURL
//forward request
client := http.Client{}
freq, reqerror := http.NewRequest(req.Method, newUrl, nil)
if reqerror != nil {
log.Fatalln(reqerror)
}
freq.Header = req.Header
freq.Body = req.Body
resp, resperr := client.Do(freq)
if resperr != nil {
log.Println(resperr)
fmt.Fprintf(w, "Error. No response")
return
}
defer resp.Body.Close()
body, ioerr := io.ReadAll(resp.Body)
if ioerr != nil {
log.Println(ioerr)
fmt.Fprintf(w, "IO Error (Response body)")
return
}
w.Header().Set("Content-Type", resp.Header.Get("Content-Type"))
w.WriteHeader(resp.StatusCode)
fmt.Fprintf(w, string(body))
}
英文:
I'm new to golang and I'm trying to build a small local proxy. The request kinda works from Postman -> localhost:9097 -> localhost:9098 and back. But the content-length is 120 and the response body is just gibberish:
I expect to get a json body like { "result": { "id": "1", "price": 100, "quantity": 1 } }
If a make a request directly to :9098 I see that the response header transfer-encoding is chunked. Any idea how to adjust my code to parse the response body from the server properly and send it back to the client?
func httpHandler(w http.ResponseWriter, req *http.Request) {
reqURL := fmt.Sprint(req.URL)
newUrl = "http://localhost:9098" + reqURL
//forward request
client := http.Client{}
freq, reqerror := http.NewRequest(req.Method, newUrl, nil)
if reqerror != nil {
log.Fatalln(reqerror)
}
freq.Header = req.Header
freq.Body = req.Body
resp, resperr := client.Do(freq)
if resperr != nil {
log.Println(resperr)
fmt.Fprintf(w, "Error. No response")
return
}
defer resp.Body.Close()
body, ioerr := io.ReadAll(resp.Body)
if ioerr != nil {
log.Println(ioerr)
fmt.Fprintf(w, "IO Error (Response body)")
return
}
w.Header().Set("Content-Type", resp.Header.Get("Content-Type"))
w.WriteHeader(resp.StatusCode)
fmt.Fprintf(w, string(body))
}
答案1
得分: 1
成功解决了！感谢Steffen Ullrich指出问题可能是“关于压缩内容”的。按照这里提到的方法，删除Accept-Encoding头部字段就可以解决问题了。
...
// 如果你手动设置了Accept-Encoding请求头部字段，那么压缩的响应将不会自动解压缩
req.Header.Del("Accept-Encoding")
freq.Header = req.Header
...
英文:
Managed to solve this now! Thanks to Steffen Ullrich for pointing out the the issue could be "about compressed content".
Removing the Accept-Encoding header as mentioned here worked like a charm.
...
// if you manually set the Accept-Encoding request header, than gzipped response will not automatically decompressed
req.Header.Del("Accept-Encoding")
freq.Header = req.Header
...
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论