Post request returns TypeError: Failed to Fetch

Topic Labels: Custom Extensions
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4 - Data Explorer
4 - Data Explorer

Whenever I try to make a post request using fetch, the Failed to Fetch error is returned. However, if I call wikipedia it goes through.

I have tried this with so many other websites e.g

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7 - App Architect
7 - App Architect

The problem here was that the URL was not secure–that is, it used HTTP instead of HTTPS.

Identified in the following post: Hey guys I need your help