The aprs.fi API URLs have been updated. They all now point to http://api.aprs.fi/api/get instead of aprs.fi.
If you have written an application using the API, you need to upgrade it to use the new links. The old URLs pointing to aprs.fi will stop working in December 2010. This change has been made to make it possible to move the API code to another server or web service process set, if necessary.
Thank you, and happy API hacking!