Trying to send messages to Teams. Should be easy enough, no? Well, not so much. This exact command runs perfectly fine in ROS 7.14, but not in 6.49
We are not using ROS7 in production yet, so I never even thought to test it on that platform until today, since I have a pair of 2116's on the bench for other testing.

So, what's wrong with the command that it returns a "400 Bad Request" when run from ROS6?

Could be url encoding

Try changes:
@ -> %40

Could be url encoding

Try changes:
@ -> %40

And the other non plain characters inside text? Probably non-7-bit-ascii text?
Probably must be all urlencoded (the text part, not all) with my urlencode function.