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Empty PATH_INFO is (probably) invalid and will (probably) fail in Rack 3.2. #2113

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#2114
Open
Empty PATH_INFO is (probably) invalid and will (probably) fail in Rack 3.2.#2113
#2114
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bug
@ioquatix

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@ioquatix
ioquatix
opened on Jul 28, 2025

See rack/rack#2316 and rack/rack#2307 for background.

These two tests use an empty PATH_INFO which is basically invalid:

sinatra/test/routing_test.rb

Lines 248 to 276 in 5e15985

it 'matches empty PATH_INFO to "/" if no route is defined for ""' do
mock_app do
get '/' do
'worked'
end
end
get '/', {}, "PATH_INFO" => ""
assert ok?
assert_equal 'worked', body
end
it 'matches empty PATH_INFO to "" if a route is defined for ""' do
mock_app do
disable :protection
get '/' do
'did not work'
end
get '' do
'worked'
end
end
get '/', {}, "PATH_INFO" => ""
assert ok?
assert_equal 'worked', body
end

A web server request must always begin with a / character, e.g.

GET / HTTP/1.0
...

There is no way that the PATH_INFO can be an empty string.

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