go-lambda-gateway

This program is a tiny Amazon API Gateway emulator, letting you invoke Go AWS Lambda functions (running locally) over HTTP. At the moment, it proxies all requests to a single function.

I'm sure there are bugs, and it's not very customizable. If you have use cases that aren't covered yet, feel free to submit pull requests!

You need to set _LAMBDA_SERVER_PORT when running your lambda to make it listen for requests on a port.

This project supports the HTTP API payload format, but you need to set PAYLOAD_FORMAT_VERSION=2.0 to use it. See examples/http-api and the documentation.

Docker image available: https://hub.docker.com/r/stefansundin/go-lambda-gateway

You can also use the program without using Docker:

go install github.com/stefansundin/go-lambda-gateway@latest

If you put a TLS certificate (.crt) and its key (.key) in the current working directory then the program will automatically use them.

Note: Beware of the capitalization of your headers. This program uses Go's net/http server, which will normalize the capitalization of your headers according to its own CanonicalHeaderKey function, whereas Amazon API Gateway does not manipulate the capitalization at all (but if you send the same header multiple times with different capitalization, it will use the first capitalization).

You may also be interested in go-lambda-invoke.