Thanks for posting up this github repo. I am new to JavaScript, Node, and Electron so this was a lot of help for me!
Also, in order to embed strictly twitch chat via the iframe with contents:
src=“https://twitch.tv/embed/monstercat/chat?parent=localhost”
I had to add:
‘https://www.twitch.tv/embed/*’
into the onHeadersReceived callback. Do you know why it has to have the “www.” in front of twitch.tv in this case? I could not get it to work without that, regardless of whether my ifram src included the www. or not