Every time I attempt to post to my lambda function URL, I am faced with a frustratingly vague 502 internal server error.
Despite deploying the function using serverless, invoking it locally or through the VSCode terminal results in a successful return. The inconsistency is puzzling and frustrating.
I'm not entirely certain what ultimately fixed the problem, but it seems like I had mistakenly added multiple post methods in the API gateway and was calling the incorrect one. After running SLS remove followed by SLS deploy, everything seemed to work properly and I was able to receive the 200 status for my API calls.
If you are utilizing API Gateway, I suggest checking out the AWS sample photo asset management app. This demonstrates how to trigger Lambda functions from a client app via API Gateway.
https://i.sstatic.net/TNfWn.png
Furthermore, there is an AWS CDK script available for configuring backend resources. After setup, you can run the app and examine the code.
Refer to this documentation topic in the AWS Code Library:
Build a photo asset management application allowing users to organize photos using labels
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