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 s
