Add API Gateway request timestamp to server variables #192
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This PR adds support for extracting the original request timestamp from the API Gateway event (`requestContext.requestTimeEpoch` or `requestContext.timeEpoch`) and exposes it in the `$_SERVER` array as `AWS_API_GATEWAY_REQUEST_TIME`. This enables more accurate request duration tracking and allows downstream code to calculate cold start latency by comparing the API Gateway arrival time to actual execution time. The timestamp is derived directly from the incoming event and kept within the request context rather than being set as a global environment variable. This keeps the data scoped to the request lifecycle and avoids side effects across concurrent executions. If preferred, I’m happy to revise this to expose it via an environment variable or another mechanism.
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This PR adds support for extracting the original request timestamp from the API Gateway event (
requestContext.requestTimeEpochorrequestContext.timeEpoch) and exposes it in the$_SERVERarray asAWS_API_GATEWAY_REQUEST_TIME.This enables more accurate request duration tracking and allows downstream code to calculate cold start latency by comparing the API Gateway arrival time to actual execution time.
The timestamp is derived directly from the incoming event and kept within the request context rather than being set as a global environment variable. This keeps the data scoped to the request lifecycle and avoids side effects across concurrent executions.
If preferred, I’m happy to revise this to expose it via an environment variable or another mechanism.