If fp is NULL and WARC is enabled, the response body will be
written only to the WARC file. If WARC is disabled and fp
is a file pointer, the data will be written to the file.
If fp is a file pointer and WARC is enabled, the body will
be written to both destinations.
If fp is NULL and WARC is enabled, the response body will be
written only to the WARC file. If WARC is disabled and fp
is a file pointer, the data will be written to the file.
If fp is a file pointer and WARC is enabled, the body will
be written to both destinations.