Flask App Issues When Deployed on Azure Web Service

Tareq El-Sayyed 0

So, I have a classification model saved as "model.h5" and a Flask app with 2 routes (/test which is a GET route & the /predict route which is a POST one).

When testing the Flask app on Postman it works normally. Then I created a Web Service and went through all the steps for the creation properly. GitHub gave me the 2 green ticks (everything is successful). The problem is when I try testing my route after deployment I keep getting a 404 error for some reason which I can't solve/figure out.

2024-05-29T08:52:20.8859272Z 169.254.129.1 - - [29/May/2024:08:52:20 +0000] "GET /test HTTP/1.1" 404 232 "-" "PostmanRuntime/7.39.0"

Postman Output:



<h1>Not Found</h1>
<p>The requested URL was not found on the server. If you entered the URL manually please check your spelling and try again.</p>

dupammi 8,035 Reputation points Microsoft Vendor

2024-05-29T13:01:00.1+00:00

Hi @Tareq El-Sayyed

Thank you for your question.

To resolve the 404 error when testing your Flask app deployed on Azure Web Service, ensure your Flask app runs locally without issues using Postman. Confirm you followed the correct deployment steps, including creating and activating a virtual environment, installing dependencies, running locally, and deploying to Azure using az webapp up --runtime PYTHON:3.9 --sku B1 --logs. Verify your Flask app's app.py file has correctly defined routes and is in the root directory. After deployment, check the logs using az webapp log tail --name <app-name> --resource-group <resource-group-name> for any issues during startup. Ensure your DNS settings are correctly configured and check for any typos in the URL you are accessing. Additionally, you can test your API documentation locally using tools like Swagger. For a more straightforward deployment process, consider deploying directly from the Azure portal by navigating to App Services, creating a new web app, and using the Deployment Center to deploy your code. By following these steps, you should be able to identify and resolve the 404 error for your Flask application on Azure Web Service.

Try to troubleshoot further by trying to test your deployed Flask app directly from the Azure portal.

Please refer to the following examples for additional troubleshooting guidance:

Configure your local environment for deploying Python web apps on Azure
Quickstart: Deploy a Python (Django or Flask) web app to Azure App Service

sample-python-flask-build-ai-web-app-6-exercise

I hope this helps. Thank you.
Tareq El-Sayyed 0 Reputation points

2024-05-30T07:30:37.5633333+00:00

Hello @dupammi Thank you for your comment.

Okay, my app runs perfectly when tested locally using Postman. The problem I asked about was when I tried deploying it from the Azure portal, I made sure that all my requirements were correct but for some reason, it was giving me this error.
dupammi 8,035 Reputation points Microsoft Vendor

2024-05-30T07:52:11.47+00:00

Hi @Tareq El-Sayyed

To further troubleshoot the issue, I suggest you try with a simpler "route" definition file with more debug/print statements and with try catch block, for debugging purposes. Additionally, you check the deployment logs for any library dependency errors that may have occurred during deployment. Also monitor the logs to see if any dependent library failed.

If issue persists, I request you to raise a support case through Azure portal.

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Flask App Issues When Deployed on Azure Web Service