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Home/ Questions/Q 7075251
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Editorial Team
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Editorial Team
Asked: May 28, 20262026-05-28T06:09:18+00:00 2026-05-28T06:09:18+00:00

Why am I unable to pass ‘<‘ character as a parameter in the URL?

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Why am I unable to pass ‘<‘ character as a parameter in the URL?
If I do:

http://localhost:9566/?myVar=2 that is ok

But I cannot do:

http://localhost:9566/?myVar=<foo> Why does this give me an error?

When I URL-encode <foo> I get %3Cfoo%3E.

And when I do http://localhost:9566/?myVar=%3Cfoo%3E, I still get the same error:

enter image description here

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  1. Editorial Team
    Editorial Team
    2026-05-28T06:09:18+00:00Added an answer on May 28, 2026 at 6:09 am

    This is by design. The characters you are trying to pass could potentially be used in a Cross Site Scripting (XSS) attack.

    Here are a few links to get you started on understanding what XSS is:

    • https://www.owasp.org/index.php/Cross-site_Scripting_%28XSS%29
    • http://www.cgisecurity.com/xss-faq.html

    While you can disable this type of validation I would not recommend it. Do you really need to pass a tag in a query string parameter?

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