Python 3.6 NotSupportedException with a Node.js backend

[jannekem]

Describe the bug

We are using Static Web Apps with a managed Node.js backend but sometimes we get a System.NotSupportedException with the following message: "Version 3.6 is not supported for language python".

Call stack:

System.NotSupportedException:
   at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerDescription.ValidateRuntimeVersion (Microsoft.Azure.WebJobs.Script, Version=4.15.0.0, Culture=neutral, PublicKeyToken=null: /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/RpcWorkerDescription.cs:150)
   at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerDescription.ValidateDefaultWorkerPathFormatters (Microsoft.Azure.WebJobs.Script, Version=4.15.0.0, Culture=neutral, PublicKeyToken=null: /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/RpcWorkerDescription.cs:126)
   at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerDescription.FormatWorkerPathIfNeeded (Microsoft.Azure.WebJobs.Script, Version=4.15.0.0, Culture=neutral, PublicKeyToken=null: /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/RpcWorkerDescription.cs:199)
   at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerConfigFactory.AddProvider (Microsoft.Azure.WebJobs.Script, Version=4.15.0.0, Culture=neutral, PublicKeyToken=null: /src/azure-functions-host/src/WebJobs.Script/Workers/Rpc/Configuration/RpcWorkerConfigFactory.cs:156)

Some exception properties:

Message: Version 3.6 is not supported for language python
Exception type: System.NotSupportedException
Failed method: Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerDescription.ValidateRuntimeVersion
Problem Id: System.NotSupportedException at Microsoft.Azure.WebJobs.Script.Workers.Rpc.RpcWorkerDescription.ValidateRuntimeVersion
Assembly: Microsoft.Azure.WebJobs.Script, Version=4.15.0.0, Culture=neutral, PublicKeyToken=null
Device type: PC
Client IP address: 0.0.0.0
SDK version: azurefunctions: 4.15.1.1
FormattedMessage: Failed to initialize worker provider for: /azure-functions-host/workers/python

To Reproduce

Generally, our application has a low amount of traffic but there are spikes during which the APIs may be called about 1500 times within a 10 minute period. During these times we see the NotSupportedException.

The staticwebapp.config.json is configured to use the node:16 API runtime.

{
  "platform": {
    "apiRuntime": "node:16"
  }
}

Expected behavior

I would expect not to get Python related errors with a Node runtime.

Screenshots

Exception graph from Application Insights:

[Gherdty]

Experiencing the same problem in my node application when Http requests spike

[harouny]

This exact issue started to show up in my Application Insights starting from 26th of October (without any changes from my side)

My staticwebapp.config.json is configured to use the node:16 API runtime.

{
  "platform": {
    "apiRuntime": "node:16"
  }
}

[benscattergood-empyrean]

Same issue here, node:16 receiving thousands of python 3.6 errors.

[nerblock]

Well, we used to get answers here but Microsoft apparently withdrew their support people from Github. I guess they want us to pay for a support plan.