= 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)]