HTTP API - Invoke lambda alias

Question

There is a lot of information about how to invoke a lambda alias with the was REST API, but the same procedure does not work for the HTTP API.

The [aws documentation](https://docs.aws.amazon.com/apigateway/latest/developerguide/http-api-stages.html) suggests that you can reference lambda function aliases with it's full arn, which makes sense except the lambda selection will not accept a full arn.

I have also given the API access to the lambda with the following CLI command (account number replaced with xx):

aws lambda add-permission  --function-name "arn:aws:lambda:eu-central-1:xxxxxxxxxxxx:function:devops-demo:development"  --source-arn "arn:aws:execute-api:eu-central-1:xxxxxxxxxxxx:cqu0317x92/*/*/devops-demo"  --principal apigateway.amazonaws.com  --statement-id 256d766f-41b1-4207-83f1-7ada60de637b  --action lambda:InvokeFunction

How can I invoke a lambda with alias from an HTTP API (not the REST API)?

Accepted Answer

Use the following format, it works for me:

arn:aws:lambda:::function::, e.g., 
arn:aws:lambda:eu-west-1:123456789:function:my_function:my_alias

The UI says it can't find it, but you are able to save.

HTTP API - Invoke lambda alias

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