= cowboy_req:has_resp_header(3) == Name cowboy_req:has_resp_header - Is the given response header set? == Description [source,erlang] ---- has_resp_header(Name, Req :: cowboy_req:req()) -> boolean() Name :: binary() %% lowercase; case insensitive ---- Return whether the given response header has been set. 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:: Header name as a lowercase binary string. Req:: The Req object. == Return value A boolean indicating whether the given response header has been set. == Changelog * *1.0*: Function introduced. == Examples .Check whether the content-type header has been set [source,erlang] ---- false = cowboy_req:has_resp_header(<<"content-type">>, Req0), Req = cowboy_req:set_resp_header(<<"content-type">>, <<"text/html">>, Req0), true = cowboy_req:has_resp_header(<<"content-type">>, Req). ---- == 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:delete_resp_header(3)[cowboy_req:delete_resp_header(3)]