I found a weird bug while setting up the Zendesk Integration Services for the first time. For some reason the content-type header for updating ZIS bundles aren't completely case insensitive as you normally would expect for such http requests.
Had an issue that the ZIS flow and associated job spec wouldn't run if the bundle was updated with "Content-Type:application/json" instead of "content-type:application/json". It would still update the bundle and the job spec could also be installed and uninstalled in both cases though.
I got it working in the end, but would just like to inform you guys of this.
Question
ZIS content-type header case-sensitivity bug
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