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Python Startup Performance on Azure App Service

Mar 01, 2021

I noticed a huge difference in app startup performance and reliability on Azure App Service when using a FastApi-based Python application depending on whether uvicorn or gunicorn is used. Fast: `python -m uvicorn app:app --host 0.0.0.0...

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Jun 30, 2023

Stripe Missing required param: items

You may see this error when calling stripe.Subscription.create(): Missing required param: items It’s a misleading message because it implies that the entire items param is missing, but you’ve probably set one of the value...

May 27, 2023

Determining if App is Running in AWS AppRunner

This does not seem to be documented anywhere. If you need to tell, from within your AWS AppRunner application, whether it’s running locally or in AWS you can check the environment variable AWS_EXECUTION_ENV. The value for the environment...

Apr 06, 2023

AWS AppRunner Pending certificate DNS validation

I had an AppRunner instance with a custom domain that was stuck on "Pending certificate DNS validation” as it was trying to validate the ACM certificates. Turns out that the UI to copy and paste the DNS validation entries can lead you a...