In one of my projects, I have an Amazon SNS subscription set up to fan out to HTTPS endpoint that is backed by Amazon API Gateway. The API Gateway has mapping template applied.
Problem
It went smoothly during test with Postman and the API Gateway test, but when SNS sends the Notification message, it threw an error. On CloudWatch log, the error message is:
Execution failed: null
Solution
Apparently SNS sends request with Content-Type of text/plain although the request body contains json while I only had mapping set for application/json. So adding mapping template for text/plain solves my problem.
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