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= cowboy_req:resp_header(3)
== Name
cowboy_req:resp_header - Response header
== Description
[source,erlang]
----
resp_header(Name, Req) -> resp_header(Name, Req, undefined)
resp_header(Name, Req, Default) -> binary() | Default
Name :: binary() %% lowercase; case insensitive
Req :: cowboy_req:req()
Default :: any()
----
Return the value for the given response header.
The response header must have been set previously using
link:man:cowboy_req:set_resp_header(3)[cowboy_req:set_resp_header(3)] or
link:man:cowboy_req:set_resp_headers(3)[cowboy_req:set_resp_headers(3)].
The header name must be given as a lowercase binary string.
While header names are case insensitive, Cowboy requires them
to be given as lowercase to function properly.
== Arguments
Name::
Desired response header name as a lowercase binary string.
Req::
The Req object.
Default::
Default value returned when the header is missing.
== Return value
The header value is returned as a binary string. When the
header is missing, the default argument is returned.
== Changelog
* *2.0*: Function introduced.
== Examples
.Get the content-type response header
[source,erlang]
----
Type = cowboy_req:resp_header(<<"content-type">>, Req).
----
.Get the content-type response header with a default value
[source,erlang]
----
Type = cowboy_req:resp_header(<<"content-type">>, Req, <<"text/html">>).
----
== See also
link:man:cowboy_req(3)[cowboy_req(3)],
link:man:cowboy_req:resp_headers(3)[cowboy_req:resp_headers(3)],
link:man:cowboy_req:set_resp_header(3)[cowboy_req:set_resp_header(3)],
link:man:cowboy_req:set_resp_headers(3)[cowboy_req:set_resp_headers(3)]
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