http interaction docs missing content type header requirement

[AEnterprise]

Description

Content-Type is a required header (and must be application/json) for new http interaction endpoint to successfully validate. It seems this requirement is not documented (any more). While most http libraries will automatically set this for you (especially if it has a helper function for json that will serialize for you), not all do.

Original announcement: https://discord.com/channels/613425648685547541/697138785317814292/832859421952180245

Steps to Reproduce

Check to docs to see if the requirement is documented

Expected Behavior

The requirement is documented

Current Behavior

It's not documented

Screenshots/Videos

No response

Client and System Information

N/A