How does an extension help me find a PII data bug?

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👋 Hello all👋

So let’s see how I found it.

I found an endpoint called information.txt.

But when I visited it it showed 404.

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Then I opened the Wayback machine extension.

Pasted my URL. and clicked on URLs like those shown in the image below.

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After I clicked on the calendar I checked every year but when I clicked 2019.

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After there I clicked on Dec 4.

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That .txt file was downloaded into my downloads folder.