The HTTP Server-Timing response header communicates one or more performance metrics about the request-response cycle to the user agent.
It is used to surface backend server timing metrics (for example, database read/write, CPU time, file system access, etc.) in the developer tools in the user's browser or in the PerformanceServerTiming interface....custom-metric with a duration of 123.4 milliseconds is sent. http HTTP/1...Server-Timing: custom-metric;dur=123.4 Warning: Only the browser's...