= cowboy_req:set_resp_cookie(3)
== Name
cowboy_req:set_resp_cookie - Set a cookie
== Description
[source,erlang]
----
set_resp_cookie(Name, Value, Req :: cowboy_req:req())
-> set_resp_cookie(Name, Value, [], Req)
set_resp_cookie(Name, Value, Opts, Req :: cowboy_req:req())
-> Req
Name :: iodata() %% case sensitive
Value :: iodata() %% case sensitive
Opts :: cow_cookie:cookie_opts()
----
// @todo I am not particularly happy about the fact that the name is iodata().
Set a cookie to be sent with the response.
Note that cookie names are case sensitive.
== Arguments
Name::
Cookie name.
Value::
Cookie value.
Opts::
Optional cookie options.
Req::
The Req object.
== Return value
A new Req object is returned.
The returned Req object must be used from that point onward,
otherwise the cookie will not be sent in the response.
== Changelog
* *2.0*: `set_resp_cookie/3` introduced as an alias to `set_resp_cookie/4` with no options.
* *1.0*: Function introduced.
== Examples
.Set a session cookie
[source,erlang]
----
SessionID = base64:encode(crypto:strong_rand_bytes(32)),
Req = cowboy_req:set_resp_cookie(<<"sessionid">>, SessionID, Req0).
----
.Set a cookie with an expiration time
[source,erlang]
----
Req = cowboy_req:set_resp_cookie(<<"lang">>, <<"fr-FR">>, [
{max_age, 3600}
], Req0).
----
.Delete a cookie
[source,erlang]
----
Req = cowboy_req:set_resp_cookie(<<"sessionid">>, <<>>, [
{max_age, 0}
], Req0).
----
.Set a cookie for a specific domain and path
[source,erlang]
----
Req = cowboy_req:set_resp_cookie(<<"inaccount">>, <<"1">>, [
{domain, "my.example.org"},
{path, "/account"}
], Req0).
----
.Restrict a cookie to HTTPS
[source,erlang]
----
SessionID = base64:encode(crypto:strong_rand_bytes(32)),
Req = cowboy_req:set_resp_cookie(<<"sessionid">>, SessionID, [
{secure, true}
], Req0).
----
.Restrict a cookie to HTTP
[source,erlang]
----
SessionID = base64:encode(crypto:strong_rand_bytes(32)),
Req = cowboy_req:set_resp_cookie(<<"sessionid">>, SessionID, [
{http_only, true}
], Req0).
----
== See also
link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:set_resp_header(3)[cowboy_req:set_resp_header(3)],
link:man:cowboy_req:reply(3)[cowboy_req:reply(3)],
link:man:cowboy_req:stream_reply(3)[cowboy_req:stream_reply(3)]
