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Improve the error when trying to send a 204/304 with a body

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Loïc Hoguin 2024-01-09 10:59:40 +01:00
parent e4a78aaeb1
commit a40bab8fb3
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2 changed files with 16 additions and 11 deletions
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23
src/cowboy_req.erl
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@ -813,20 +813,26 @@ reply(Status, Headers, SendFile = {sendfile, _, Len, _}, Req)
%% Neither status code must include a response body. (RFC7230 3.3)
reply(Status, Headers, Body, Req)
when Status =:= 204; Status =:= 304 ->
0 = iolist_size(Body),
do_reply(Status, Headers, Body, Req);
do_reply_ensure_no_body(Status, Headers, Body, Req);
reply(Status = <<"204",_/bits>>, Headers, Body, Req) ->
0 = iolist_size(Body),
do_reply(Status, Headers, Body, Req);
do_reply_ensure_no_body(Status, Headers, Body, Req);
reply(Status = <<"304",_/bits>>, Headers, Body, Req) ->
0 = iolist_size(Body),
do_reply(Status, Headers, Body, Req);
do_reply_ensure_no_body(Status, Headers, Body, Req);
reply(Status, Headers, Body, Req)
when is_integer(Status); is_binary(Status) ->
do_reply(Status, Headers#{
<<"content-length">> => integer_to_binary(iolist_size(Body))
}, Body, Req).
do_reply_ensure_no_body(Status, Headers, Body, Req) ->
case iolist_size(Body) of
0 ->
do_reply(Status, Headers, Body, Req);
_ ->
exit({response_error, payload_too_large,
'204 and 304 responses must not include a response body. (RFC7230 3.3)'})
end.
%% Don't send any body for HEAD responses. While the protocol code is
%% supposed to enforce this rule, we prefer to avoid copying too much
%% data around if we can avoid it.
@ -851,12 +857,11 @@ stream_reply(_, _, #{has_sent_resp := _}) ->
%% 204 and 304 responses must NOT send a body. We therefore
%% transform the call to a full response and expect the user
%% to NOT call stream_body/3 afterwards. (RFC7230 3.3)
stream_reply(Status = 204, Headers=#{}, Req) ->
stream_reply(Status, Headers=#{}, Req)
when Status =:= 204; Status =:= 304 ->
reply(Status, Headers, <<>>, Req);
stream_reply(Status = <<"204",_/bits>>, Headers=#{}, Req) ->
reply(Status, Headers, <<>>, Req);
stream_reply(Status = 304, Headers=#{}, Req) ->
reply(Status, Headers, <<>>, Req);
stream_reply(Status = <<"304",_/bits>>, Headers=#{}, Req) ->
reply(Status, Headers, <<>>, Req);
stream_reply(Status, Headers=#{}, Req) when is_integer(Status); is_binary(Status) ->