Hmm...according to rfc2616 you're just trying to introduce a bug...
"The presence of a message-body in a request is signaled by the
inclusion of a Content-Length or Transfer-Encoding header field in
the request's message-headers. A message-body MUST NOT be included in
a request if the specification of the request method (section 5.1.1)
does not allow sending an entity-body in requests."
Response 204 MUST NOT include a body, therefore body presence MUST NOT be signaled by Content-Length header.
Hmm...according to rfc2616 you're just trying to introduce a bug...
"The presence of a message-body in a request is signaled by the
inclusion of a Content-Length or Transfer-Encoding header field in
the request's message-headers. A message-body MUST NOT be included in
a request if the specification of the request method (section 5.1.1)
does not allow sending an entity-body in requests."
Response 204 MUST NOT include a body, therefore body presence MUST NOT be signaled by Content-Length header.