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Showing articles tagged #nodejs.

A Backslash Made Nginx and Node Disagree About an Admin Route
Engineering·10 min read

A Backslash Made Nginx and Node Disagree About an Admin Route

I sent 750 HTTP requests through 10 server configurations. One encoded backslash passed an Nginx guard and reached the Node handler it was meant to block. How URL normalization turns a reasonable access rule into a boundary that protects the wrong thing.

November 5, 2026

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