Fetch calls look doubled

[floatingpurr]

Hi, I'm going over this tutorial. It looks like some fetch calls are doubled. E.g., in v0.7 (and below), this is what you can spot in the network tab of Google Chrome when you open the Blog home page:

There are 2 calls to http://localhost:5000/api/feed with an identical content. It seems strange. Why does it happen?

[miguelgrinberg]

This is new in react 18. It only happens in development builds. See this stack overflow answer for an explanation. Note that this does not happen with production builds.

[floatingpurr]

Thank you @miguelgrinberg!