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[Appservice] Fix #31394: az functionapp deployment source config-zip: never ending loop on flex function app health check#33388

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[Appservice] Fix #31394: az functionapp deployment source config-zip: never ending loop on flex function app health check#33388
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dylan8902:flex-functionapp-loop-fix

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@dylan8902 dylan8902 commented May 17, 2026

Related command

az functionapp deployment source config-zip

Description

The check_flex_app_after_deployment function called after a deployment had a never ending re-try loop for non-2xx response status codes. This PR adds the missing num_trials increment. It also breaks out of the health check when an IP restriction is found preventing the health check to complete from the client.

Testing Guide

An existing function app with a default network rule of Deny has no access from the client to the app. Run the deployment command:

az functionapp deployment source config-zip \
 --resource-group MyResourceGroup  \
 --name MyUniqueAppName \
 --src funcapp.zip

Before it would hang forever, but now transient errors are handled and retries are done up the the limit.

History Notes


This checklist is used to make sure that common guidelines for a pull request are followed.

Adds missing tries count
Breaks out if IP restriction in place
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azure-client-tools-bot-prd Bot commented May 17, 2026

️✔️AzureCLI-BreakingChangeTest
️✔️Non Breaking Changes

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yonzhan commented May 17, 2026

Thank you for your contribution! We will review the pull request and get back to you soon.

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The git hooks are available for azure-cli and azure-cli-extensions repos. They could help you run required checks before creating the PR.

Please sync the latest code with latest dev branch (for azure-cli) or main branch (for azure-cli-extensions).
After that please run the following commands to enable git hooks:

pip install azdev --upgrade
azdev setup -c <your azure-cli repo path> -r <your azure-cli-extensions repo path>

@dylan8902 dylan8902 changed the title [Appservice] Fix #31394: az functionapp deployment source config-zip - never ending loop on flex function app health check [Appservice] Fix #31394: az functionapp deployment source config-zip: never ending loop on flex function app health check May 17, 2026
@dylan8902 dylan8902 marked this pull request as ready for review May 17, 2026 03:20
Copilot AI review requested due to automatic review settings May 17, 2026 03:20
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Pull request overview

Fixes a hang in the App Service module’s post-deployment health check for Flex Function Apps invoked by az functionapp deployment source config-zip, by ensuring the retry loop terminates and by short-circuiting when the health check is blocked by IP restrictions.

Changes:

  • Increment num_trials for non-2xx health-check responses to prevent an infinite retry loop.
  • Exit the health-check loop early when a 403 response indicates IP-based access restriction.

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

break
if response.status_code == 403 and response.reason == 'Ip Forbidden':
logger.warning("Failed to check health due to IP restriction")
break
Comment on lines +825 to +828
if response.status_code == 403 and response.reason == 'Ip Forbidden':
logger.warning("Failed to check health due to IP restriction")
break
num_trials = num_trials + 1
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4 participants