anchor.diff:  nc_zero(Config) ->
   	do_nc(Config, "/dev/zero").
   
  -onresponse_capitalize(Config) ->
  -	Client = raw_open(Config),
  -	ok = raw_send(Client, "GET / HTTP/1.1\r\nHost: localhost\r\n\r\n"),
  -	Data = raw_recv_head(Client),
  -	false = nomatch =:= binary:match(Data, <<"Content-Length">>),
  -	ok.
  -
  -%% Hook for the above onresponse_capitalize test.
  -do_onresponse_capitalize_hook(Status, Headers, Body, Req) ->
  -	Headers2 = [{cowboy_bstr:capitalize_token(N), V}
  -		|| {N, V} <- Headers],
  -	cowboy_req:reply(Status, Headers2, Body, Req).
  -
  -onresponse_crash(Config) ->
  -	ConnPid = gun_open(Config),
  -	Ref = gun:get(ConnPid, "/handler_errors?case=init_before_reply"),
  -	{response, fin, 777, Headers} = gun:await(ConnPid, Ref),
  -	{<<"x-hook">>, <<"onresponse">>} = lists:keyfind(<<"x-hook">>, 1, Headers).
  -
  -onresponse_reply(Config) ->
  -	ConnPid = gun_open(Config),
  -	Ref = gun:get(ConnPid, "/"),
  -	{response, nofin, 777, Headers} = gun:await(ConnPid, Ref),
  -	{<<"x-hook">>, <<"onresponse">>} = lists:keyfind(<<"x-hook">>, 1, Headers),
  -	ok.
  -
  -%% Hook for the above onresponse tests.
  -do_onresponse_hook(_, Headers, _, Req) ->
  -	cowboy_req:reply(<<"777 Lucky">>, [{<<"x-hook">>, <<"onresponse">>}|Headers], Req).
  -
   parse_host(Config) ->
   	ConnPid = gun_open(Config),
   	Tests = [
  
positive.code: 		env => #{dispatch => init_dispatch(Config)},
  		compress => true
  	}, Config);
  %% Most, if not all of these, should be in separate test suites.
  init_per_group(onresponse, Config) ->
  	{ok, _} = cowboy:start_clear(onresponse, [{port, 0}], [
  		{env, [{dispatch, init_dispatch(Config)}]},
  		{onresponse, fun do_onresponse_hook/4}
  	]),
  	Port = ranch:get_port(onresponse),
  	[{type, tcp}, {port, Port}, {opts, []}|Config];
  init_per_group(onresponse_capitalize, Config) ->
  	{ok, _} = cowboy:start_clear(onresponse_capitalize, [{port, 0}], [
  		{env, [{dispatch, init_dispatch(Config)}]},
  		{onresponse, fun do_onresponse_capitalize_hook/4}
  	]),
  	Port = ranch:get_port(onresponse_capitalize),
  	[{type, tcp}, {port, Port}, {opts, []}|Config];
  init_per_group(parse_host, Config) ->
  	Dispatch = cowboy_router:compile([
  		{'_', [
  
negative.code: 		{https, [parallel], Tests},
  		{http_compress, [parallel], Tests},
  		{https_compress, [parallel], Tests},
  		{parse_host, [], [
  			parse_host
  		]},
  