3pp.d20pfsrd.com is a service of bySwarm to provide permanent links to d20pfsrd.com content. With over 10,000 pages and content being re-organized on a regular basis, permanent links can be very important for publishers who want to put a link do d20pfsrd.com that will be usable even if a page changes its address. Mike Bohlmann at bySwarm created this system that crawls the d20pfsrd.com site every few days, following the links that it finds on each page. The crawler creates a permanent alias based on the unique identifier hidden within each page.

How to find an alias for a page

Let's say that you wanted to have a permanent link to the Crossbowman archetype for the Fighter class. The first thing to do is find the Crossbowmen page at d20pfsrd.com. Copy the page address - the URL - from your browser. Next go to 3pp.d20pfsrd.com and paste the address into the box near the top of the page. 

The system will then show you the permanent alias for that page. In this case, it is http://3pp.d20pfsrd.com/crossbowman. That link will always go to the Crossbowman archetype page as long as the crawler knows where it is currently located.

How to request a new alias or update a page

If you search for an address and there is no alias provided, you can ask the crawler to check an address the next time it runs, usually within an hour. To submit an address to check, use the Crawl Request box on the right. This can be useful, too, if you find a page that needs to have its target address updated. For example, if the Crossbowmen page changes addresses at d20pfsrd.com, you can tell the crawler where it can find it on its next run. Without that, it could take the crawler a little while to find the new address.