Fix for open redirect - identified in Issue 2429 #2500
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The 404 processing ends up redirecting a request with multiple path slashes to that site, i.e.
https://my-site//shedcode.co.uk will redirect to https://shedcode.co.uk
Identified in issue #2429
This commit uses a regular expression and a substitution to remove the multiple leading slashes before redirecting.
📚 Documentation preview 📚: https://datasette--2500.org.readthedocs.build/en/2500/