Create http.Response instance with sample body string in golang

http go response
Rana picture Rana · Nov 29, 2015 · Viewed 23.3k times · Source

I am willing to create a sample http.Response instance in golang with a sample body string.

Problem is, its body property accepts ReadCloser instance. But as its a dummy response instance, I was wondering if there is some trick to set it easily without setting up all that stream read/close parts.

Answer

boaz_shuster picture boaz_shuster · Nov 29, 2015

As suggested by Not_a_Golfer and JimB:

io.ReadCloser is an interface that is satisfied when a struct implements both the Read and the Close functions.

Fortunately, there is ioutil.NopCloser, which takes a io.Reader and wraps it in the nopCloser struct, which implements both Read and Close. However, its Close function does nothing as implied from the name.

Here is an example:

package main

import (
    "bytes"
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    t := http.Response{
        Body: ioutil.NopCloser(bytes.NewBufferString("Hello World")),
    }

    buff := bytes.NewBuffer(nil)
    t.Write(buff)

    fmt.Println(buff)
}

To play with the code, click here.

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