Setting Cookies in http Response

[laxman.v...@gmail.com]

Hi All,

I have a situation to create a http response and return to a function whose return type should be response(not response writer).

newrsp = &http.Response{
                                                StatusCode: 200,
                                                Body:       ioutil.NopCloser(strings.NewReader("my string")),
                                        }
By using above method I can set the headers of http and also body. But is there is a way to set a cookie without Writer.

Thanks & Regards,
L Vallandas

[Ilya Kostarev]

Seems to me
Coocie lives in http.Response.Header(which is a map[string][]string) with key "Set-Cookie". After constructing http.Cookie(which is a struct) or getting existent  one way you serialize it to string with *Coocie.String() and add to Response.Header with responce.Header.Add("Set-Cookie", *coocie.String())

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[msilv...@cloudflare.com]

> Coocie lives in http.Response.Header(which is a map[string][]string) with key "Set-Cookie". After constructing http.Cookie(which is a struct) or getting existent  one way you serialize it to string with *Coocie.String() and add to Response.Header with responce.Header.Add("Set-Cookie", *coocie.String())

Just call http.SetCookie(w, cookie) - https://golang.org/pkg/net/http/#SetCookie

[laxman.v...@gmail.com]

Adding Set-Cookie to response.Header crashes. Headers can be added to Response headers using response.Header.Add() except cookies.
http://play.golang.org/p/Gwtc0rXQka

newrsp.Header.Add("Set-Cookie", sslCookie.String()) ---> panics with error:panic serving 127.0.0.1:40698: assignment to entry in nil map

@msilv, problem is not just setting the cookie. its about possibility of setting the cookie in http response without using http response writer.

[Jesse McNelis]

On Tue, Apr 26, 2016 at 4:13 PM, <laxman.v...@gmail.com> wrote:
>
> Adding Set-Cookie to response.Header crashes. Headers can be added to
> Response headers using response.Header.Add() except cookies.
> http://play.golang.org/p/Gwtc0rXQka
> newrsp.Header.Add("Set-Cookie", sslCookie.String()) ---> panics with
> error:panic serving 127.0.0.1:40698: assignment to entry in nil map
>

This crashes because response.Header is nil. You need to initialize it first.
eg. newrsp.Header = http.Header{}

Your use of http.SetCookie() also doesn't work because you're sending
the response body first, preventing any further headers from being
added.

This example works, it does set the cookie twice though.
https://play.golang.org/p/tKjt44y_5b