Unable to use Microsoft Graph endpoints - "2.1.12570.11 - NCUS ProdSlices" is not valid header value

[Nikola Petkanski]

PHP version: 7.4

Description
We make use of Microsoft Graph endpoints and with the most recent version we've got the following exception to pop up:

"2.1.12570.11 - NCUS ProdSlices" is not valid header value

This change seems to be part of the recent changes:

• 1.8.3...1.8.4

I have not checked the RFC about it, but it feels odd that we can't send those headers anymore.

Shouldn't the receiving side be validating them, not the sending one?

[Graham Campbell]

Fixed in 1.8.5.