What are GCD files?

A GCD file is just a simple text file that describes where the actual resource is, what it is named, etc. Format is important and order might be important. Here is a sample.

Content-Type: image/jpeg
Content-Name: jmaple.jpg
Content-Version: 1.0
Content-Vendor: Rumkin
Content-URL: http://rumkin.com/images/jmaple.jpg
Content-Size: 12384

Important things to know about the GCD file:

• It must have Unix-style linefeeds (LF, not CR/LF or CR)
• It must have 2 linefeeds after the Content-Size line
• The server must respond with the MIME type "text/x-pcs-gcd"
• Content-URL must be the correct URL, and must be an absolute URL (it must start with http:// or https://)
• Content-Size must be the exact number of bytes of the file
• Content-Type must match the MIME type returned by the server and must match the MIME type in the Mime Type List
• Only some Content-Types are usable with some phones -- Not all phones understand GIF images or MP3 files, for example
• Avoid spaces in filenames
• Only one space comes after the ":" for all of the headers.