POST之前GoLang中的GZip JSON有效负载

Question

I have a JSON object of type []byte that I created from a struct using json.Marshal. I want to GZip the JSON before posting it to my endpoint. The following does not work:

gz := gzip.NewWriter(myJSON)

because []byte does not implement io.Writer.

Is there some very simple way I can do this once I already have my JSON created?

Answer 1

Compress to a buffer and post that buffer.

 var buf bytes.Buffer
 gz := gzip.NewWriter(&buf)
 gz.Write(myJSON)
 gz.Close()

Because a *bytes.Buffer statisifies the io.Reader interface, you can use the buffer directly when creating the request.

 req, err := http.NewRequest("POST", url, &buf)
 if err != nil {
     // handle error
 }
 req.Header.Set("Content-Encoding", "gzip")
 req.Header.Set("Content-Type", "application/json; charset=utf-8")