CORS is not working on Windows Phone

[NNTin]

Reproduction Link

https://nntin.github.io/pasteview/?paste=32z9wKpi

Steps to reproduce

This is my website (source). It takes a paste from Pastebin, e.g.: https://pastebin.com/32z9wKpi and displays it on the website. (Limitation: Paste has to be made from a Pastebin Pro account due to CORS headers.)
Windows Phone
Software: Windows 10 Mobile, Version: 1709
Microsoft Lumia 650 Dual-SIM Smartphone

What is Expected?

You see the paste on the website.

What is actually happening?

On Windows Phone the paste couldn't be retrieved.

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It works fine on desktop/laptop. I don't have an Android or iPhone to test it on mobile. Also I don't know how to debug on Windows Phone.
Vue, vue-slider, vue-color and the 2-way binding etc. are working fine.
Not sure if the bug is with vue-resource or windows phone. Windows phone has very bad support in general. :|