The text below shows an HTTP response header sent from a server. (The characters are carriage return and line feed characters, respectively.)

HTTP/1.1 200 OK Date: Thu, 27 Jan 2011 20:16:29 GMT Server: Apache/2.2.17 (Unix) PHP/5.3.5 mod_ssl/2.2.17 OpenSSL/0.9.8q Last-Modified: Thu, 06 Jan 2011 15:06:32 GMT ETag: "9cb-4992ed8d18e02" Accept-Ranges: bytes Content-Length: 2507 Connection: close Content-Type: text/html 

There are __________ bytes in the document being returned.