fix: Handle comma-separated values in x-forwarded-port header

[lucadelauw]

When Azure Functions applications are deployed behind proxies or load balancers (such as Azure Application Gateway), the 'x-forwarded-port' header may contain multiple comma-separated port values (e.g., "443,8080,433"). The current implementation attempts to convert the entire string to an integer, which causes an error and subsequent function crash.

My fix extracts the first port value from this header and also strips whitespaces. Also included new tests for these

see: Azure/azure-functions-python-worker#1768

[lucadelauw]

@microsoft-github-policy-service agree

[lucadelauw]

Can this please be looked at since it's quite a blocking issue. This is a fairly straightforward fix
@hallvictoria Would be highly appreciated if we can slip this into the next release. Thanks!

[hallvictoria]

Hi @lucadelauw, thanks for this. Our next beta release (1.25.0b2) has a lot of changes currently, but we can look at taking this in the beta release after (1.25.0b3). ETA for b3 release will be ~end of this week to unblock this scenario

[hallvictoria]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[hallvictoria]

Hey @lucadelauw, I noticed that this PR doesn't fix the original scenario based on the bug report, where the x-forwarded-port value being passed in is 90344081.test.com. I had a couple other comments, so thought it'd be easier if I opened a separate PR for this #307. Please feel free to take a look and make sure it helps your scenario!

[lucadelauw]

I see. I indeed just implemented the scenario that I specifically had issues with. Your new PR seems to cover that and more. Thanks!