AWS Lambda provides an HTTP API for custom runtimes to receive invocation events from Lambda and send response data back within the Lambda execution environment.
http://localhost:9001/2018-06-01/runtime/invocation/next
http://${AWS_LAMBDA_RUNTIME_API}/2018-06-01/runtime/invocation/nextDocs: <https://docs.aws.amazon.com/lambda/latest/dg/runtimes-api.html#runtimes-api-next>
Source: Server Side Request Forgery/SSRF-Cloud-Instances.md in PayloadsAllTheThings. From PayloadsAllTheThings by Swissky and contributors. MIT License, Copyright (c) 2019 Swissky.