Hi,
The usual penultimate for that URL would usually be a function ?????_pluginfile() in the component's lib.php but since this is a core component, the function is in the lib/filelib.php in the file_pluginfile() function. A call is made to send_stored_file() function where the 2nd parameter is the 'file time to live' variable. However, it is generally accepted that it is not really a good idea to change the core code. I think you can override $CFG->filelifetime variable but only if the 2nd parameter passed to send_stored_file() is null. Unfortunately, the blog files are set with a 10 minute cache lifetime.
The usual penultimate for that URL would usually be a function ?????_pluginfile() in the component's lib.php but since this is a core component, the function is in the lib/filelib.php in the file_pluginfile() function. A call is made to send_stored_file() function where the 2nd parameter is the 'file time to live' variable. However, it is generally accepted that it is not really a good idea to change the core code. I think you can override $CFG->filelifetime variable but only if the 2nd parameter passed to send_stored_file() is null. Unfortunately, the blog files are set with a 10 minute cache lifetime.
Hope that helps
