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Add options to control h2's SETTINGS_HEADER_TABLE_SIZE

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Loïc Hoguin 2018-04-25 16:55:52 +02:00
parent bc79529b4d
commit 8f4adf437c
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4 changed files with 147 additions and 16 deletions
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84
test/rfc7540_SUITE.erl
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@ -18,6 +18,7 @@
-import(ct_helper, [config/2]).
-import(ct_helper, [doc/1]).
-import(ct_helper, [name/0]).
-import(cowboy_test, [gun_open/1]).
-import(cowboy_test, [raw_open/1]).
-import(cowboy_test, [raw_send/2]).
@ -2449,6 +2450,89 @@ continuation_with_extension_frame_interleaved_error(Config) ->
% (Section 5.4.1) of type PROTOCOL_ERROR.
%% (RFC7540 6.5.2)
settings_header_table_size_client(Config) ->
doc("The SETTINGS_HEADER_TABLE_SIZE setting can be used to "
"inform the server of the maximum header table size "
"used by the client to decode header blocks. (RFC7540 6.5.2)"),
HeaderTableSize = 128,
%% Do the handhsake.
{ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]),
%% Send a valid preface.
ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n",
cow_http2:settings(#{header_table_size => HeaderTableSize})]),
%% Receive the server preface.
{ok, << Len0:24 >>} = gen_tcp:recv(Socket, 3, 1000),
{ok, << 4:8, 0:40, _:Len0/binary >>} = gen_tcp:recv(Socket, 6 + Len0, 1000),
%% Send the SETTINGS ack.
ok = gen_tcp:send(Socket, cow_http2:settings_ack()),
%% Receive the SETTINGS ack.
{ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000),
%% Initialize decoding/encoding states.
DecodeState = cow_hpack:set_max_size(HeaderTableSize, cow_hpack:init()),
EncodeState = cow_hpack:init(),
%% Send a HEADERS frame as a request.
{ReqHeadersBlock1, _} = cow_hpack:encode([
{<<":method">>, <<"GET">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/">>}
], EncodeState),
ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, ReqHeadersBlock1)),
%% Receive a HEADERS frame as a response.
{ok, << Len1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000),
{ok, RespHeadersBlock1} = gen_tcp:recv(Socket, Len1, 6000),
{RespHeaders, _} = cow_hpack:decode(RespHeadersBlock1, DecodeState),
{_, <<"200">>} = lists:keyfind(<<":status">>, 1, RespHeaders),
%% The decoding succeeded, confirming that the table size is
%% lower than or equal to HeaderTableSize.
ok.
settings_header_table_size_server(Config0) ->
doc("The SETTINGS_HEADER_TABLE_SIZE setting can be used to "
"inform the client of the maximum header table size "
"used by the server to decode header blocks. (RFC7540 6.5.2)"),
HeaderTableSize = 128,
%% Create a new listener that allows larger header table sizes.
Config = cowboy_test:init_http(name(), #{
env => #{dispatch => cowboy_router:compile(init_routes(Config0))},
max_decode_table_size => HeaderTableSize
}, Config0),
%% Do the handhsake.
{ok, Socket} = gen_tcp:connect("localhost", config(port, Config), [binary, {active, false}]),
%% Send a valid preface.
ok = gen_tcp:send(Socket, ["PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n",
cow_http2:settings(#{header_table_size => HeaderTableSize})]),
%% Receive the server preface.
{ok, << Len0:24 >>} = gen_tcp:recv(Socket, 3, 1000),
{ok, Data = <<_:48, _:Len0/binary>>} = gen_tcp:recv(Socket, 6 + Len0, 1000),
%% Confirm the server's SETTINGS_HEADERS_TABLE_SIZE uses HeaderTableSize.
{ok, {settings, #{header_table_size := HeaderTableSize}}, <<>>}
= cow_http2:parse(<<Len0:24, Data/binary>>),
%% Send the SETTINGS ack.
ok = gen_tcp:send(Socket, cow_http2:settings_ack()),
%% Receive the SETTINGS ack.
{ok, << 0:24, 4:8, 1:8, 0:32 >>} = gen_tcp:recv(Socket, 9, 1000),
%% Initialize decoding/encoding states.
DecodeState = cow_hpack:init(),
EncodeState = cow_hpack:set_max_size(HeaderTableSize, cow_hpack:init()),
%% Send a HEADERS frame as a request.
{ReqHeadersBlock1, _} = cow_hpack:encode([
{<<":method">>, <<"GET">>},
{<<":scheme">>, <<"http">>},
{<<":authority">>, <<"localhost">>}, %% @todo Correct port number.
{<<":path">>, <<"/">>}
], EncodeState),
ok = gen_tcp:send(Socket, cow_http2:headers(1, fin, ReqHeadersBlock1)),
%% Receive a HEADERS frame as a response.
{ok, << Len1:24, 1:8, _:40 >>} = gen_tcp:recv(Socket, 9, 6000),
{ok, RespHeadersBlock1} = gen_tcp:recv(Socket, Len1, 6000),
{RespHeaders, _} = cow_hpack:decode(RespHeadersBlock1, DecodeState),
{_, <<"200">>} = lists:keyfind(<<":status">>, 1, RespHeaders),
%% The decoding succeeded on the server, confirming that
%% the table size was updated to HeaderTableSize.
ok.
% SETTINGS_ENABLE_PUSH (0x2): This setting can be used to disable
% server push (Section 8.2). An endpoint MUST NOT send a
% PUSH_PROMISE frame if it receives this parameter set to a value of