Various components of your Plex Media Server will cache HTTP requests sometimes. These can include channels and metadata agents as well as system plugins. This is almost always beneficial, but there may occasionally be times where clearing a particular cache might be useful for a user (typically only when instructed to do so).
Where HTTP Caches are Located
The caches are located within your main Plex Media Server data directory. The specific location can vary depending on your operating system
On Windows, the content is located inside of the user directory.
%LOCALAPPDATA%\Plex Media Server\Plug-in Support\Caches\
Using the Finder's "Go" menu, select Go To Folder... then enter the following in the dialog box that pops up:
~/Library/Application Support/Plex Media Server/Plug-in Support/Caches
In general, the Plug-Ins folder for the various Linux versions of Plex Media Server will be found under:
$PLEX_HOME/Library/Application Support/Plex Media Server/Plug-in Support/Caches
How to Clear a Cache
/Plug-in Support/Caches directory, there will be subdirectories corresponding to different channels, agents, and plugins. To clear the cache, you simply delete the directory for the item in which you're interested.
For instance, if you wish to clear the cache for the "Last.fm" music agent, you would delete the following directory:
As always, having a backup of your data is a good idea before making changes.
Related Page: Backing Up Plex Media Server Data