Path Info Urls
When using path info data , the urls of codeignitor apps or your custom mvc frameworks looks something like this
example.com/index.php/controller/method/param1/param2 or example.com/controller/method/param1/param2
The path info data can be used to specify which class and method should be invoked on server application.
Forward slash in parameter
Sometimes it might so happen that the pathinfo parameters have a forward slash in them. Such a url when encoded could look like this:
example.com/index.php/controller/method/par%2Fam1/param2
Note that the forward slash is encoded to %2F.
However such urls might not work in the default configuration of Apache and you would simply get a "Page Not Found" error.
This happens if AllowEncodedSlashes directive of Apache is not turned on.
More Here.
This directive should be turned on to allow those sort of Urls. And for codeignitor $config['permitted_uri_chars'] should also be checked to allow forward slash in uri characters.
