7.1 HTTP Status Codes

Only successful and valid requests MUST be counted. For web server log files successful requests are those with specific HTTP status codes (200 and 304). The standards for HTTP status codes are defined and maintained by the IETF HTTP working group in a series of RFCs (most notably RFC 7231). If key events are used, their definition MUST match the HTTP standards. (For more information see The Friendly Guide to Release 5: Technical Notes for Content Providers.)