Which web browsers have built-in protection to automatically encode URLs in the address bar to prevent XSS attacks?

Recently, I have been conducting some testing related to , , and on my website. I observed that modern like the latest versions of Firefox and Chrome automatically escape URLs entered into the address bar.

For example:

http://example.com/search/?q="><script>alert('hi');</script>

gets sent to my server as:

http://example.com/search/?q=%22%3e%3cscript%3ealert(%27hi%27)%3b%3c%2fscript%3e

I am curious if there is a comprehensive list available of all major web browsers that perform this automatic escaping, as well as those that do not. Additionally, I would like to know if mobile browsers also exhibit this behavior.

Answer №1

In my opinion, the majority of browsers properly escape URLs according to RFC standards, with the exception of those that may contain bugs or fail to follow RFC3986.

Answer №2

One option to consider for testing is which offers similar functionality.

For example, you can run a test at:

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