Ask about a filtering rule for nginx

Question

Some illegal characters need to be filtered out in the server's URL: For example | ; $ @ ' " &lt; &gt; ( ) document LF Because all locations are required, it is written below the server: {code...} I am a regular novice, Asking for expert guidance...

PHPz · Answer

It is recommended to write the single-character blacklist and multi-character blacklist in two sections
Single-character blacklist:

if ( $request_uri ~ [|;$@'"<>()] ) {
    return 403;
    }

Multiple characters:

if ( $request_uri ~ (document|LF) {
    return 403;
    }

迷茫 · Answer

The question should be written more clearly