How do I recover the body of the response body by the middleware，this question has perplex me a few days，please help me，thank you all the same

[jimmy-yu-1990]

Description

I want to write a middleware to intercept the response body and recover the response body ,I think that go use the responseWriter interface to io the response ,but it seems so hard to rewrite the body,

relation
https://stackoverflow.com/questions/33606330/golang-rewrite-http-request-body

[kszafran]

I believe that the standard ResponseWriter writes directly to the HTTP response, so you couldn't extract the response body from it. You could however replace the Writer field in gin.Context with your own implementation of a ResponseWriter. For example some kind of wrapper around the default writer that would buffer the response, transform it, etc.

One way to go about it would be to create a struct like:

type MyResponseWriter {
    gin.ResponseWriter
}

// implement all the methods you need to override
func (w *MyResponseWriter) Write([]byte) (int, error) { ... }

And use it like:

c.Writer = &MyResponseWriter{c.Writer}