Nodejs Web App on Azure

Prakhar Sinha 36

2020-12-18T17:39:06.652323823Z [41m [30mfail [39m [22m [49m: Middleware[0]
2020-12-18T17:39:06.652355023Z Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 30585.959ms with message: An error occurred while sending the request.. Check application logs to verify the application is properly handling HTTP traffic.

Have tried to debug my application but havent been able to pin down the exact reason. What maybe causing this error for a nodejs webapp?

Ryan Hill 25,826 Reputation points Microsoft Employee

2020-12-21T03:39:32.967+00:00
Hi @Prakhar Sinha ,

Sorry to hear you're experiencing this issue. The log snippet you provided doesn't provide much to go on. It sounds like you've already enabled logging. If you could include more of the log, that would be helpful, including:

Is this a brand new app or has been deployed for awhile and just starting to experience this issue?

Does the error occur app startup?

Does it occur when navigating to specific URI?

What app plan is your app hosted in...Windows or Linux? Are you using a docker image?

Regards,
Ryan
Ho Ca 1 Reputation point

2020-12-22T00:57:08.993+00:00

The same problem happened to me as well.
The previous deploy of NodeJS Web App has no problem, but the next deploy caught in trouble with error message as PrakharSinha-3818:
2020-12-22T00:52:31.830632540Z: [INFO] [41m [30mfail [39m [22m [49m: Middleware[0]
2020-12-22T00:52:31.832529518Z: [INFO] Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 120105.137ms with message: An error occurred while sending the request.. Check application logs to verify the application is properly handling HTTP traffic.
Jigar Patel 41 Reputation points

2021-01-09T23:34:46.13+00:00

I had the same exact issue and all I did to fix it was change the name of the node js server's route. However I still don't understand why this fixed the issue. I would like to know the cause of the issue so that I can prevent it in the future.

example:
previous route name: serverURL.com/old-route-name
new route name: serverURL.com/new-route-name
Vitor Martins 1 Reputation point

2021-04-14T14:10:31.353+00:00

I still got the problem.
Максим Щербаков 11 Reputation points

2021-07-01T15:42:42.363+00:00

we've got the same result

2021-07-01T13:29:19.378594865Z: [INFO] Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 60167.224ms with message: Error while copying content to a stream.. Check application logs to verify the application is properly handling HTTP traffic.

du to the file upload action.
but some time it may not happen!

Alexei Chizmakov 1

Same result for us - during large file uploads (> 250MB).

2021-08-03T06:56:35.094692897Z Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 1508.614ms with message: An error occurred while sending the request.. Check application logs to verify the application is properly handling HTTP traffic.

2021-08-03T07:06:55.314757843Z Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 60008.388ms with message: Error while copying content to a stream.. Check application logs to verify the application is properly handling HTTP traffic.

Alexei Chizmakov 1 Reputation point

2021-08-03T07:40:58.807+00:00
Hi @Ryan Hill .

Do you have any thoughts regarding this issue?

NOTE: We have NodeJS Linux Web App on Azure.

Answering your previous questions:

Is this a brand new app or has been deployed for awhile and just starting to experience this issue?

> This is a brand new app

Does the error occur app startup?

> The error occurs on multipart PUT requests. NOTE: the request comes from a different origin and inside the Azure App Service CORS config page we have "*" in Allowed Origins.

Does it occur when navigating to a specific URI?

> Yes on domain.com/asset/upload

What app plan is your app hosted in...Windows or Linux? Are you using a docker image?

> Linux without a docker image
Benoit Lacelle 1 Reputation point

2021-08-03T19:44:52.203+00:00

We encounter the same issue with a Java application.

Is this a brand new app or has been deployed for awhile and just starting to experience this issue?

> Deployed for a while

Does the error occur app startup?

> This happens on MultiPart POST with binary >= 5MB

Does it occur when navigating to a specific URI?

> It happens when submitting a form to a specific URI/route of our application.

What app plan is your app hosted in...Windows or Linux? Are you using a docker image?

> Linux with a docker image
Ryan Hill 25,826 Reputation points Microsoft Employee

2021-08-03T23:28:07.63+00:00

@Alexei Chizmakov @Benoit Lacelle what version of Node you both running?
Alexei Chizmakov 1 Reputation point

2021-08-04T05:13:06.913+00:00

@Ryan Hill Node 12 LTS
Benoit Lacelle 1 Reputation point

2021-08-04T06:47:52.737+00:00

No nodeJs. This is a Java app.
HOLDEN Nicholas 1 Reputation point

2021-09-29T22:34:44.207+00:00

I'm also getting this error on python 3.9 azure app service. I found it in the easyauth docker log, note the seemingly v quick timeout? Diagnostic doesn't show anything about running out of sockets etc.

2021-09-28T13:23:46.973948204Z Updating certificates in /etc/ssl/certs...
2021-09-28T13:23:57.598799636Z 11 added, 0 removed; done.
2021-09-28T13:23:57.599145637Z Running hooks in /etc/ca-certificates/update.d...
2021-09-28T13:23:57.604871265Z done.
2021-09-28T13:23:57.610101990Z Updated CA certificates

2021-09-28T14:05:43.941258580Z [41m [30mfail [39m [22m [49m: Middleware[0]
2021-09-28T14:05:43.941295880Z Failed to forward request to application. Encountered a System.Net.Http.HttpRequestException exception after 2.002ms with message: An error occurred while sending the request.. Check application logs to verify the application is properly handling HTTP traffic.
Nataliia Todosiychuk (EXT) 1 Reputation point

2022-01-13T13:17:36.663+00:00

The same error on Azure app service with python 3.8, django and gunicorn
After this error 504 504 Gateway Time-out occured
Maciej Szuchta 1 Reputation point

2022-05-16T08:26:20.777+00:00

Did you manage to solve that. I also have this issue on python 3.9
Lex Li (Microsoft) 4,742 Reputation points Microsoft Employee

2022-08-12T06:24:51.507+00:00

Sounds like the errors were written by YARP, because otherwise Node.js/Java/PHP web apps themselves won't write anything like System.Net.Http.HttpRequestException.

As YARP is there as reverse proxy, its errors still are related to its upstream (your Node.js web app). For example, 30585.959ms is very large, so your Node.js might hang.

You might be able to learn what's exactly wrong from https://learn.microsoft.com/en-us/answers/questions/94289/how-to-view-the-application-logs-of-an-azure-web-a.html
Camuvingian 1 Reputation point

2022-08-23T09:43:47.047+00:00

I am having the same issue with a PUT request into a Docker container running as a App Service on Azure. I am seeing

"Error while copying content to a stream."

I can send tiny files, but all the parameters sent are null/undefined and not read. Is this a BINDING ISSUE?
Lex Li (Microsoft) 4,742 Reputation points Microsoft Employee

2023-01-18T17:40:56.4666667+00:00

@Camuvingian You'd better post another question instead. The error message you received differs so it can be a different situation.
Muhammad Maroof Subhani 40 Reputation points

2023-01-27T06:49:11.6+00:00

has anybody find any solution for it , facing the same issue .
Ryan Hill 25,826 Reputation points Microsoft Employee

2023-01-27T21:15:39.0966667+00:00

@Muhammad Maroof Subhani can you post a new question with more details about your app service configuration i.e., OS type, runtime stack, log snippets.

8 answers

David Gorman 0 Reputation points

2023-01-18T15:10:28.3533333+00:00

Had the same issue; added the Ip to CORS to see if that elevates that issue.
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Matthew Collis 0 Reputation points

2023-07-31T21:53:02.7133333+00:00
Just an FYI, I found this which might be related: https://stackoverflow.com/questions/56300156/query-headers-too-large-on-azure-if-auth-enabled. I have updated my package.json file with the following in the scripts section and so far, so good:

"scripts": { "start": "node --max-http-header-size=16384" }
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Matthew Collis 0 Reputation points

2023-08-03T20:39:02.9433333+00:00

This did not appear to help after a longer period of testing - just updating here.
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Khordoo, Mahmood (IST) 0 Reputation points

2024-04-23T21:17:35.7766667+00:00
I resolved the issue by removing the 'Poetry run'. The container was running fine on the local machine but was only failing in the web app. I was using FastAPI with Poetry for managing Python dependencies. It seems like the Azure Web app has issues with 'Poetry run'.

This was the issue in my Docker

CMD ["poetry", "run", "python", "serve.py"]

I resolved the issue by exporting the dependencies to a requirements.txt file and performing a global pip install. I then ran the following commands to make it work

CMD ["python", "serve.py"]
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