Support for 'Expect' header is non-functional
It is not possible to post a form to lighty that contains the 'Expect' header.
Any such request is met with a 417 (Bad Expectation). http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.4.18 for more detail on error code 417.
This stops cilents that use the header dead in the water.
Also available in: Atom