Lighttpd

On line 1999 in file mod_fastcgi.c,

 if (NULL != (c = buffer_search_string_len(hctx->response, "\r\n\r\n", 4)))

only sequence "\r\n\r\n" was considered as the end of http header. But
the sequence "\n\n" should be considered as the end of header too. Since
this is supported by apache, many CGIs should have been written this way.
So this line will break many CGIs and cause too much trouble.

According to http://www.ietf.org/rfc/rfc1945.txt
The line terminator for HTTP-header fields is the sequence CRLF.
However, we recommend that applications, when parsing such headers,
recognize a single LF as a line terminator and ignore the leading CR.
"\n\n" should be supported.