This is a showcase for serverless-offline issue: dherault/serverless-offline#747

Steps to reproduce:

1. clone this repo and cd into its directory
2. install dependencies: npm install
3. start serverless offline: sls offline or npm start
4. navigate browser to localhost:4000/api

Unsupported Media Type error is logged in the console:

Serverless: GET /api (λ: apiTest)
Serverless: Failure: Unsupported Media Type
UnknownError: Unsupported Media Type

Expected - invoke lambda from within other http-event triggered lambda

I'm using node version 10.15.3

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UPDATE: as pointed by @vepanimas, it works if function name is specified as: {service-name}-{stage}-{name}

in our case:

INVOKE_FUNCTION: '${self:service}-${self:provider.stage}-invokeTest'