JavaScript Blob to download a binary file creating corrupted files

Question

I have a binary file (python pickle file, to be exact). Whenever such a file is requested, I create one on server side, and then send it to the client via flask\'s

Answer 1

Weirdly enough, I was looking into this answer, which worked. So, I added :

xhrFields: {
    responseType:'blob'
},

in the AJAX request, which solved the problem for me.

I have absolutely no idea, why this worked, so can someone give a better answer than this?

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At MDN Docs:

The values supported by responseType are the following:
An empty responseType string is treated the same as "text", the default type.
arraybuffer
The response is a JavaScript ArrayBuffer containing binary data.
blob
The response is a Blob object containing the binary data.
...