As outlined in the Airbrake documentation and this YouTube video , resolving 406 errors requires investigating both the client request and server configuration:
Review mod_security logs to see if a firewall is blocking the request. 406 mp4
The server understands the request but cannot provide the data in the requested format. As outlined in the Airbrake documentation and this
The server may reject requests from specific browsers or user agents that it considers "not acceptable". Troubleshooting and Solutions 406 mp4