Function App Crashing Due to System.Net.Http.HttpRequestException

Question

Function App Crashing Due to System.Net.Http.HttpRequestException

DJ 50

Hi

I am experiencing recurring crashes on my Azure Function App due to a System.Net.Http.HttpRequestException. The error message indicates an issue with an outgoing HTTP request, and it is causing the function to terminate unexpectedly.

The error message displayed in the Azure portal:
I have never experienced this in the past, but it appears as soon I click on the function app in the portal.


We identified the below thread resulted in a **System.Net.Http.HttpRequestException** for your App aardraapi and application code should be fixed to prevent impact to application availability. ``` System.Net.Http.HttpConnectionPool+<ConnectToTcpHostAsync>d__98.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.ValueTuple`2[[System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib]] System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.ValueTuple`2[[System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib]] System.Private.CoreLib]].GetResult System.Net.Http.HttpConnectionPool+<ConnectAsync>d__97.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.ValueTuple`3[[System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib]] System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.ValueTuple`3[[System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib][System.__Canon System.Private.CoreLib]] System.Private.CoreLib]].GetResult System.Net.Http.HttpConnectionPool+<CreateHttp11ConnectionAsync>d__99.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.__Canon System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.HttpConnectionPool+<AddHttp11ConnectionAsync>d__74.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Threading.Tasks.TaskCompletionSourceWithCancellation`1+<WaitWithCancellationAsync>d__1[[System.__Canon System.Private.CoreLib]].MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.__Canon System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.HttpConnectionPool+<GetHttp11ConnectionAsync>d__76.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.__Canon System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.HttpConnectionPool+<SendWithVersionDetectionAndRetryAsync>d__84.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.DiagnosticsHandler+<SendAsyncCore>d__8.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Threading.Tasks.ValueTask`1[[System.__Canon System.Private.CoreLib]].get_Result System.Runtime.CompilerServices.ConfiguredValueTaskAwaitable`1+ConfiguredValueTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.RedirectHandler+<SendAsync>d__4.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification System.Runtime.CompilerServices.ConfiguredTaskAwaitable`1+ConfiguredTaskAwaiter[[System.__Canon System.Private.CoreLib]].GetResult System.Net.Http.HttpClient+<<SendAsync>g__Core|83_0>d.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification AardraApi.devicecontrol+<Start_check>d__5.MoveNext System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw System.Threading.Tasks.Task+<>c.<ThrowAsync>b__128_1 System.Threading.QueueUserWorkItemCallback+<>c.<.cctor>b__6_0 System.Threading.ExecutionContext.RunForThreadPoolUnsafe[[System.__Canon System.Private.CoreLib]] ``` A crash happens when an exception in your code goes un-handled and terminates the process. When your application crashes, all the in-flight requests (request that are currently being processed by the app) are aborted. An end user may experience an HTTP 502 error for those requests. Azure App Service Platform has a **Proactive Crash Monitoring** feature that attaches a debugger to your process and records the call-stack of the crashing thread whenever your process crashes with an unhandled exception. If the above call stack is not helping in identifying the root cause of the crash, you can enable **Crash Monitoring** feature to collect a memory dump when the process crashes.

Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-10T04:10:31.7466667+00:00
DJ

We have found an issue in the aardraapi application that caused a System.Net.Http.HttpRequestException.

To fix this, please follow these steps:

Verify Network Connectivity:

Ensure the target endpoint is accessible from the application's environment.

Use tools like Postman or curl to send requests and check responses.

Check for any firewall rules or network security groups blocking outbound traffic.

Inspect SSL/TLS Configuration:

Confirm that the SSL certificate of the target endpoint is valid and issued by a trusted authority.

Ensure the application supports the required TLS version to prevent handshake failures.

Handle DNS Resolution Issues:

If the error indicates that the remote name could not be resolved, verify that the DNS settings are correctly configured.

Ensure the domain name is valid and accessible.

Please review these steps and let us know if you need further assistance.
Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-13T08:38:17.19+00:00

DJ

Just checking in to see if my previous response answered your question. If you have any further questions, feel free to ask!
Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-17T08:25:50.02+00:00

DJ

I just wanted to follow up to see if the solution worked for your issue. Let us know if you need any further clarification or assistance.

Looking forward to your update.
DJ 50 Reputation points

2025-03-17T09:00:14.2966667+00:00

@Sai Prabhu Naveen Parimi

Sorry for my late reply.

This Api is being called by my App, via HTTP. This message has gone away now, so maybe it was temporary .

Is possible we can use some option or Application Insight to send us email when such exceptions occurs?
RithwikBojja 3,055 Reputation points Microsoft External Staff Moderator

2025-03-24T09:55:27.69+00:00

The error System.Net.Http.HttpRequestException, occurs when an HTTP request fails. The error you have got did it logged in Traces, Do you have the invocation Id of that error?
RithwikBojja 3,055 Reputation points Microsoft External Staff Moderator

2025-03-25T03:28:14.11+00:00

We haven’t heard from you on the last response and was just checking back to see if you have any resolution yet.

1 answer

Your answer

Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-10T04:10:31.7466667+00:00

DJ

We have found an issue in the aardraapi application that caused a System.Net.Http.HttpRequestException.

To fix this, please follow these steps:

Verify Network Connectivity:

Ensure the target endpoint is accessible from the application's environment.

Use tools like Postman or curl to send requests and check responses.

Check for any firewall rules or network security groups blocking outbound traffic.

Inspect SSL/TLS Configuration:

Confirm that the SSL certificate of the target endpoint is valid and issued by a trusted authority.

Ensure the application supports the required TLS version to prevent handshake failures.

Handle DNS Resolution Issues:

If the error indicates that the remote name could not be resolved, verify that the DNS settings are correctly configured.

Ensure the domain name is valid and accessible.

Please review these steps and let us know if you need further assistance.
Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-13T08:38:17.19+00:00

DJ

Just checking in to see if my previous response answered your question. If you have any further questions, feel free to ask!
Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-17T08:25:50.02+00:00

DJ

I just wanted to follow up to see if the solution worked for your issue. Let us know if you need any further clarification or assistance.

Looking forward to your update.
DJ 50 Reputation points

2025-03-17T09:00:14.2966667+00:00

@Sai Prabhu Naveen Parimi

Sorry for my late reply.

This Api is being called by my App, via HTTP. This message has gone away now, so maybe it was temporary .

Is possible we can use some option or Application Insight to send us email when such exceptions occurs?
RithwikBojja 3,055 Reputation points Microsoft External Staff Moderator

2025-03-24T09:55:27.69+00:00

The error System.Net.Http.HttpRequestException, occurs when an HTTP request fails. The error you have got did it logged in Traces, Do you have the invocation Id of that error?
RithwikBojja 3,055 Reputation points Microsoft External Staff Moderator

2025-03-25T03:28:14.11+00:00

We haven’t heard from you on the last response and was just checking back to see if you have any resolution yet.

Answer 1

Sai Prabhu Naveen Parimi 2,335 Microsoft External Staff Moderator

@DJ

No worries about the late reply! Glad to hear that the issue seems to have resolved itself.

Yes, you can set up Azure Application Insights to send email alerts when such exceptions occur. You can refer to the following documents for step-by-step guidance:

These should help you set up alerts to monitor and get notified of such exceptions

Please do not forget to click "Accept the answer” and Yes wherever the information provided helps you, this can be beneficial to other community members.

If you have any other questions or still running into more issues, let me know in the "comments" and I would be happy to help you.

Sai Prabhu Naveen Parimi 2,335 Reputation points Microsoft External Staff Moderator

2025-03-20T01:22:21.6366667+00:00

DJ

Just checking to see if you need any help setting up alerts or have any other questions. Happy to help!
DJ 50 Reputation points

2025-03-20T09:38:43.4166667+00:00

@Sai Prabhu Naveen Parimi

In application insight, I am not seeing information on this exception. I would like to understand the cause and prior to this firing what happened.

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Function App Crashing Due to System.Net.Http.HttpRequestException

1 answer

Your answer