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== 50x Fatal Moodle errors == | == 50x Fatal Moodle errors == |
Revision as of 08:29, 16 May 2020
There is a variety of way different errors can happen in Moodle. Because they each happen under different circumstance there cannot be a single way of handling them, and where possible and desirable to customize them.
404 - Normal Moodle errors and exceptions
These types of errors are things like you tried to access a course which no longer exists, or access a course which you don't have access to. Because these are "Moodle" pages they are themed correctly and normally there isn't much you want to do to improve them.
If you want to change the wording of the errors see:
https://docs.moodle.org/en/Language_customisation
If you want to change the theme, that is one and the same as normal theme customization:
https://docs.moodle.org/dev/Themes_overview
If a Moodle page throws an exception which isn't captured and results in an error page, and it will also helpfully, but blindly, link into this Moodle wiki where you might find more information on the error. This is great for sites in development or for admin type errors but typically less useful. You may want to divert users to your own support instead of off into a wiki page with generic Moodle information.
This links behavior can be changed and removed in your admin settings here:
/admin/settings.php?section=documentation
https://docs.moodle.org/dev/Exceptions
404 File not found - Web server errors
These are for errors which are technically outside of moodle such a 404 file not found at the server level rather than a 404 served by moodle. If you want to theme these the same as you normally would for anything non Moodle, but there is another option to send 404's to a Moodle themed php page so it gets the theming for free. You can see an example of what this error page looks like here:
Apache
You can configure this using:
ErrorDocument 404 /error/index.php
nginx
error_page 404 /error/index.php;
50x Fatal Moodle errors
TBA
These types of errors are more fundamental, and something has gone wrong so Moodle itself can't load, which means the error page can't access the database, MUC, or the language and strings API.
These are difficult to style, and there are many edge cases to capture. This should get fixed in this tracker:
https://tracker.moodle.org/browse/MDL-56041
503 Maintenance mode
During maintenance mode Moodle will serve a "503 Service Unavailable". This page can be customized
https://docs.moodle.org/38/en/Maintenance_mode#CLI_maintenance_mode