Lighttpd

http://article.gmane.org/gmane.comp.web.lighttpd/1099

A little bug in lighttpd 1.3.10 in handling POST requests when
keep-alive is used, here are some simple test cases:

echo -e "POST / HTTP/1.1\r\nHost: x\r\nContent-length: 1\r\n\r\nxPOST / HTTP/1.1\r\nHost:
x\r\nContent-length: 1\r\n\r\nx" | nc localhost 80

This gives two responses (as it should), however

echo -e "POST / HTTP/1.1\r\nHost: x\r\nContent-length: 1\r\n\r\nx\r\nPOST / HTTP/1.1\r\nHost:
x\r\nContent-length: 1\r\n\r\nx" | nc localhost 80

(With an extra newline before the second POST) gives a response
followed by a 400.

-- David Leadbeater <dgl <at> dgl.cx>