POST request from addon page to server is empty

[NilkasG (Niklas Gollenstede)]

I think this may be related to this discussion I just remembered:

WebExtension form POST sent as GET from window created with chrome.windows.create

Hi, I have a WebExtension that uses chrome.windows.create() to open a window that displays a locally packaged HTML file. In the locally packaged HTML file I have an HTML that has method=“post”. The action posts to an external URL / another site which then processes the data and displays a small UI. When I load in my WebExtension from my every-day FF profile using “Load temporary add-on” everything works great. The signed copy of my extension installed in my users’ browsers also works great…

The conclusion there was that it is a bug, which still hasn’t been fixed.

Here are some different approaches that might work:

• don’t just have a form POSTing to the target host, embed an iframe with that form from that host instead (assuming you control that server)
• use GET (just keep some security aspects in mind)
• use XHR or fetch to POST (in a submit handler, grab the formdata and programmatically post it, then handle the response)