How to describe the structure of the input data?

Question

go

When sending a request, json with data or an error may be returned in response. How to describe the resp.Body structure in this case?

resp, err := http.Get(requestURL)
if err != nil {
      // ...
}

defer resp.Body.Close()

Answer 1

resp.Body contains only bytes and nothing else.
You can, depending on the status of the resp.Status server response, choose how you process the data.
For example, in my projects it is done like this:
When the request status is 200, I decode it as usual.
If the status is different, I expect it to contain another structure containing the description of the error, and I try to decode it into this structure and return it as an error.
But if error decoding fails, then I simply return an error containing the Body text.

Answer 2

The Content-Type key in the header describes what the data in the body is. For json: application/json
type := resp.Header.Get("Content-Type")