rewind($f);
var_dump(stream_get_contents($f));
--EXPECTF--
-string(96) "HTTP/1.1 416 Requested Range Not Satisfiable
+string(129) "HTTP/1.1 416 Requested Range Not Satisfiable
Accept-Ranges: bytes
Content-Range: bytes */6
+Transfer-Encoding: chunked
+
+0
"