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I try to read the request body via request.GetBody(), since I need to read the same request body more than once, but I always get the error below. I checked if the req.body is empty, but it is not. I cant even call req.GetBody(). My Go version is 1.8.1.
func read(res http.ResponseWriter, req *http.Request) {
_, err := req.GetBody()
if err != nil {
res.Write([]byte(err.Error()))
return
}
}
Error:
http: panic serving [::1]:53174: runtime error: invalid memory address or nil pointer dereference
562
Inspecting and mocking request body One option is to read the whole body using ioutil. ReadAll() , which gives you the body as a byte slice. You may use bytes. NewBuffer() to obtain an io.
To read the body of the response, we need to access its Body property first. We can access the Body property of a response using the ioutil. ReadAll() method. This method returns a body and an error.
GET requests don't have a request body, so all parameters must appear in the URL or in a header. While the HTTP standard doesn't define a limit for how long URLs or headers can be, mostHTTP clients and servers have a practical limit somewhere between 2 kB and 8 kB.
You must close the Body (if present) on all code paths you might take. You probably do not want to close the Body before having processed it (or at least parts of it).
The GetBody() func on Request is only for client requests (see the documentation over the GetBody member: https://golang.org/pkg/net/http/#Request), but it looks like you're doing a server-side handler. Therefore, you need to use the req.Body member, which is an io.ReadCloser. To read from an io.ReadCloser you can use the io/ioutil package and the ReadAll() func:
b, err := ioutil.ReadAll(req.Body)
if err != nil {
panic(err)
}
fmt.Printf("%s", b)
More information on the ReadAll() func: https://golang.org/pkg/io/ioutil/#example_ReadAll
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