There is an error logged for each request which comes through AJP connector:

12:29:30,374 ERROR [JIoEndpoint] JIoEndpoint.run: Socket[addr=/127.0.0.1,port=39410,localport=8009]
12:29:30,374 ERROR [JIoEndpoint] JIoEndpoint.run: false false false

However, response is sent back to client correctly and other possible impacts are unknown to me now.