kevinhillinger / serverless-http-call

Serverless HTTP Call (outbound)

Show an http call to a flask app from a serverless function in Azure Functions using Python.

HTTP Call Chain Azure Function (Python) --> Flask App

Getting Started

Deploy the flask app

change director to the flask app and execute the build and deploy script.

cd ./flaskapp
./build_deploy.sh

This will create an Azure Resource Group with a Container Registry. It will build the flask app into a Docker container, then deploy the container to an Azure Container Instance.

After it's deployed, note the hostname of the container instance that's printed out from the script to standard out. you can also get the information yourself running the CLI command:

az container list -g flaskapp --output json

Deploy the Function App

Follow the instructions to deploy the function to Azure using the following options:

• VS Code
• CLI

NOTE: regardless of deployment method, target the flaskapp resource group. This will make it easy to clean up the resources when done with the example

Test the demo

Make an HTTP call out to the Function App endpoint for the http triggered function. An example local call:

curl http://localhost:7071/api/httpRequestResponse\?host\=flaskapp-demo.eastus.azurecontainer.io

[2021-08-19T16:29:43.003Z] Executing 'Functions.httpRequestResponse' (Reason='This function was programmatically called via the host APIs.', Id=6ad47ecb-6000-4a14-ab22-b9a7ebd67924)
[2021-08-19T16:29:43.191Z] Response from flaskapp-demo.eastus.azurecontainer.io:
[2021-08-19T16:29:43.191Z] request received = 16:29:42.

Cleanup

Azure resources

az group delete -n flaskapp --no-wait --yes