-- It works.
application/x-www-form-urlencoded
-- It supports non constant arguments.
application/x-www-form-urlencoded
*/*
-- Empty string for non-existent headers.
application/x-www-form-urlencoded

-- I can use my own headers.
wtf
-- Some headers cannot be obtained.


-- The setting matters.
FUNCTION_NOT_ALLOWED
-- The setting is not enabled by default.
FUNCTION_NOT_ALLOWED
-- Are headers case-sentitive?
application/x-www-form-urlencoded

-- Using it from non-HTTP does not make sense.


-- Does it work for distributed queries? (not yet, but maybe it will be needed later)