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Lint checks for Content-Length or Body on Status with no Body #592

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Lint checks for Content-Length or Body on Status with no Body #592

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12 changes: 12 additions & 0 deletions lib/Plack/Middleware/Lint.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -141,6 +141,11 @@ sub validate_res {
unless (defined $val) {
die("Response headers MUST be a defined string. Header: $key");
}
if ($key =~ /^Content-Length$/i) {
if (Plack::Util::status_with_no_entity_body($res->[0])) {
die("Response headers MUST NOT include Content-Length for Status $res->[0]");
}
}
}

# @$res == 2 is only right in psgi.streaming, and it's already checked.
Expand All @@ -156,6 +161,13 @@ sub validate_res {
die("Body must be bytes and should not contain wide characters (UTF-8 strings)");
}

if (@$res == 3
&& Plack::Util::status_with_no_entity_body($res->[0])
&& Plack::Util::content_length($res->[2])
) {
die("Body must be empty for Status $res->[0]");
}

return $res;
}

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3 changes: 3 additions & 0 deletions t/Plack-Middleware/lint.t
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Expand Up @@ -24,6 +24,9 @@ my @bad = map { Plack::Middleware::Lint->wrap($_) } (
sub { return sub { shift->([ 200, [], {} ]) } },
sub { return sub { shift->([ 200, [], undef ]) } },
sub { return [ 200, [ "X-Foo", undef ], [ "Hi" ] ] },
sub { return [ 204, [ "Content-Length", 10 ], [ "No Content" ] ] },
sub { return [ 204, [ "Content-Length", 0 ], [ "" ] ] },
sub { return [ 204, [], [ "No Content" ] ] },
);

my @good = map { Plack::Middleware::Lint->wrap($_) } (
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