`aws-lambda-go/lambda` appears to rewrite and break `AWS_LAMBDA_RUNTIME_API` URI scheme

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
45/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
aws, go
Domain
backend, cloud

Research direction

Start by tracing how the github.com/aws/aws-lambda-go/lambda module reads AWS_LAMBDA_RUNTIME_API and constructs the Lambda Runtime API endpoint. Reproduce the issue with http://localhost:2222, then verify that the configured URI is preserved before /2018-06-01/runtime/invocation/next and the other endpoints.

Written by the indexing model from the issue text.

Description

Description of issue

When running a Go handler with the Lambda module (github.com/aws/aws-lambda-go/lambda), setting the env var of AWS_LAMBDA_RUNTIME_API to http://localhost:2222 results in the following error:

2023/03/27 20:44:58 failed to get the next invoke: Get "http://http//localhost:2222/2018-06-01/runtime/invocation/next": dial tcp: lookup http: no such host

It appears this module does not want a URI scheme (specifically: http://) specified, which appears to be at odds with how other official AWS libraries that make use of the Lambda Runtime API (and AWS_LAMBDA_RUNTIME_API env var) seem to work.

Expected result

Whatever is found in the AWS_LAMBDA_RUNTIME_API env var is exactly the URI that should be used preceding the /2018-06-01/runtime/invocation/next (and other) endpoint(s).

Steps to reproduce

Run a module that imports github.com/aws/aws-lambda-go/lambda and ensure that your AWS_LAMBDA_RUNTIME_API starts with http://.

Dominant language
Go
Stars
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Forks
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Avg merge
16h 56m
Merged PRs (30d)
2

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