AJAX problem with Lighttpd and jQuery

While converting the environment of one of my business projects from Apache to Lighttpd, I experienced a problem, which didn't occur with Apache before. The following code worked fine in Aapache:

$.post('http://example.com/ajax');

When executing the same request to Lighttpd, you receive the following error message:

411 - Length Required

The solution was pretty simple, thought I only found it because it was working in another place with a similar case. The solution is to add an empty POST-object to the request (which will then send the content-length header):

$.post('http://example.com/ajax', {});

Hopefully this will help somone who experienced the same problem.