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How to resolve encoded URI characters in CodeIgniter urls?

I am using CodeIgniter 1.7.1 . My allowed URI characters are set as such:

$config['permitted_uri_chars'] = 'az 0-9~%.:_()@&\-';

When I type in an address, for example http://website.com/index.php/controller/method/test%21 , the page does not load and gives me an error:

Igniter Code: An error has been detected. The URI you sent is forbidden characters.

I do not understand. %20 (space) is allowed, but %21 (exclamation point) is not.

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2 answers

% 21 to make out! in the encoder. Therefore codeigniter does not support this, please! to the allowed uri cofig file:

 $config['permitted_uri_chars'] = 'az 0-9~%.:_()@&\-!';
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try doing it with this that should work

 \\+
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Source: https://habr.com/ru/post/1410782/

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