I had a server running on localhost port 3000 using NodeJs.

There I had a database linked and had 2 basic POST methods (Create and Delete)*.

*(I had not written any extra checking for request headers)

I was curious to know if only client-side JS (with a dummy HTML page) can perform the deletion by itself!

I wrote THIS in the client-side js (in a separate directory )

After trying the POST Delete operation like this , I got this ERROR

But even though error was raised, the "Deletion Operation" was still performed succesfully and the data with the specific id was deleted!

My Question is "what exactly is blocked if it was not the deletion operation ?