FASTLY_TRACE_ID

A UUID generated by Fastly for each incoming request. This is often a useful value to include in log messages, and also to send to upstream servers as an additional custom HTTP header, allowing for straightforward correlation of a request processed by Fastly with the same request when it is later processed by an origin server.


This is a companion discussion topic for the original entry at https://developer.fastly.com/reference/compute/ecp-env/fastly-trace-id