Hello!
Because of RFC 7230
The presence of a message body in a request is signaled by a
Content-Length or Transfer-Encoding header field. Request message
framing is independent of method semantics, even if the method does
not define any use for a message body.
I think clammit should perform virus checks for all method types, not only for POST, PUT, PATCH.
This could be easily implemented by removing POST, PUT, PATCH checks and just comparing Content-Length and/or actual body size to 0.