addr is not NULL. */
if (!transport_headers_send(addr, fd, add_headers, remove_headers, &write_chunk,
use_crlf, rewrite_rules, rewrite_existflags))
addr is not NULL. */
if (!transport_headers_send(addr, fd, add_headers, remove_headers, &write_chunk,
use_crlf, rewrite_rules, rewrite_existflags))