Update Cowlib to 2.0.1 and fix OTP 20.1+ Websocket compression

Unfortunately compression will be disabled for 20.1, 20.1.1
and 20.1.2. In additiona I do not recommend 20.1.3 due to
issues inflating some specific sizes.

Makefile

@@ -11,7 +11,7 @@ COMPILE_FIRST = cowboy_middleware cowboy_stream cowboy_sub_protocol
 PLT_APPS = public_key ssl
 CT_OPTS += -ct_hooks cowboy_ct_hook [] # -boot start_sasl
 
-CI_OTP ?= OTP-19.0.7 OTP-19.1.6 OTP-19.2.3 OTP-19.3.6.3 OTP-20.0.5 OTP-20.1.2
+CI_OTP ?= OTP-19.0.7 OTP-19.1.6 OTP-19.2.3 OTP-19.3.6.3 OTP-20.0.5 OTP-20.1.3
 CI_HIPE ?= $(lastword $(CI_OTP))
 # CI_ERLLVM ?= $(CI_HIPE)
 
@@ -20,7 +20,7 @@ CI_HIPE ?= $(lastword $(CI_OTP))
 LOCAL_DEPS = crypto
 
 DEPS = cowlib ranch
-dep_cowlib = git https://github.com/ninenines/cowlib 2.0.0
+dep_cowlib = git https://github.com/ninenines/cowlib 2.0.1
 dep_ranch = git https://github.com/ninenines/ranch 1.4.0
 
 DOC_DEPS = asciideck

rebar.config

@@ -1,4 +1,4 @@
 {deps, [
-{cowlib,".*",{git,"https://github.com/ninenines/cowlib","2.0.0"}},{ranch,".*",{git,"https://github.com/ninenines/ranch","1.4.0"}}
+{cowlib,".*",{git,"https://github.com/ninenines/cowlib","2.0.1"}},{ranch,".*",{git,"https://github.com/ninenines/ranch","1.4.0"}}
 ]}.
 {erl_opts, [debug_info,warn_export_vars,warn_shadow_vars,warn_obsolete_guard,warn_export_all,warn_missing_spec,warn_untyped_record]}.

src/cowboy_websocket.erl

@@ -144,23 +144,27 @@ websocket_extensions(State=#state{extensions=Extensions}, Req=#{pid := Pid},
 		[{<<"permessage-deflate">>, Params}|Tail], RespHeader) ->
 	%% @todo Make deflate options configurable.
 	Opts = #{level => best_compression, mem_level => 8, strategy => default},
-	case cow_ws:negotiate_permessage_deflate(Params, Extensions, Opts#{owner => Pid}) of
+	try cow_ws:negotiate_permessage_deflate(Params, Extensions, Opts#{owner => Pid}) of
 		{ok, RespExt, Extensions2} ->
 			websocket_extensions(State#state{extensions=Extensions2},
 				Req, Tail, [<<", ">>, RespExt|RespHeader]);
 		ignore ->
 			websocket_extensions(State, Req, Tail, RespHeader)
+	catch exit:{error, incompatible_zlib_version, _} ->
+		websocket_extensions(State, Req, Tail, RespHeader)
 	end;
 websocket_extensions(State=#state{extensions=Extensions}, Req=#{pid := Pid},
 		[{<<"x-webkit-deflate-frame">>, Params}|Tail], RespHeader) ->
 	%% @todo Make deflate options configurable.
 	Opts = #{level => best_compression, mem_level => 8, strategy => default},
-	case cow_ws:negotiate_x_webkit_deflate_frame(Params, Extensions, Opts#{owner => Pid}) of
+	try cow_ws:negotiate_x_webkit_deflate_frame(Params, Extensions, Opts#{owner => Pid}) of
 		{ok, RespExt, Extensions2} ->
 			websocket_extensions(State#state{extensions=Extensions2},
 				Req, Tail, [<<", ">>, RespExt|RespHeader]);
 		ignore ->
 			websocket_extensions(State, Req, Tail, RespHeader)
+	catch exit:{error, incompatible_zlib_version, _} ->
+		websocket_extensions(State, Req, Tail, RespHeader)
 	end;
 websocket_extensions(State, Req, [_|Tail], RespHeader) ->
 	websocket_extensions(State, Req, Tail, RespHeader).