Origin server logs each HTTP request in the access.log file under <Origin install>/logs/http folder. Each entry in the file comprises the following fields:
Local Date and Time on the Server
HTTP verb : GET/PUT/POST/DELETE
IP address and port of the remote client
Requested URL
Response code
Request Content Length
Response Content Length
Time taken to serve out the request in milliseconds
Access logs usually provide good insight into most streaming issues, for example fragments not reaching origin or rejected with 4xx code.