http: prevent writing to the body when not allowed by HTTP spec

PR-URL: https://github.com/nodejs/node/pull/47732
Reviewed-By: Robert Nagy <ronagy@icloud.com>
Reviewed-By: Paolo Insogna <paolo@cowtech.it>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

doc/api/errors.md

@@ -1338,6 +1338,11 @@ When using [`fs.cp()`][], `src` or `dest` pointed to an invalid path.
 
 <a id="ERR_FS_CP_FIFO_PIPE"></a>
 
+### `ERR_HTTP_BODY_NOT_ALLOWED`
+
+An error is thrown when writing to an HTTP response which does not allow
+contents. <a id="ERR_HTTP_BODY_NOT_ALLOWED"></a>
+
 ### `ERR_HTTP_CONTENT_LENGTH_MISMATCH`
 
 Response body size doesn't match with the specified content-length header value.