Azure Question posted in
The official documentation to get you started can be found here.

Cannot execute Azure function from portal – "0 Unknown HTTP error", "Failed to fetch"

All of our Azure function apps are failing to execute manually from the Azure Portal. When we go to do Test/Run for any of our functions in any function app, we get the following error:

Http response code: 0 Unknown HTTP error

Http response content: Error: {"message":"Failed to fetch","stack":"TypeError: Failed to fetchn at https://portal.azure.com/Content/Dynamic/fOu-tO_OJd0O.js:226:23724","isError":true}

enter image description here

All of our functions are configured the following way:

  • FUNCTIONS_EXTENSION_VERSION = ~4
  • FUNCTIONS_WORKER_RUNTIME = dotnet-isolated
  • CORS -> Allowed Origins = https://portal.azure.com
  • All C# code is .net 8

Executing manually from the Azure portal was working a week or two ago, and we’ve not made any changes that we can think of. Any ideas?

Tags:

2

Answers


  1. 0

    I got the same error when I deployed .NET 8.0 isolated Azure functions from visual studio to Azure function app.

    enter image description here

    To resolve this, click on CORS URL in the warning=> it redirects to the CORS page. In the "Allowed Origins" section, add * to allow access to all origins.

    • Check if the allowed origin is reflecting under CORS after updating successfully.

    enter image description here

    Application Settings of function app:

    enter image description here

    Able to run the function as expected after enabling CORS.

    enter image description here

    Login or Signup to reply.
  2. 0

    We are experiencing the same issue. Azure Functions were running perfectly until two weeks ago. However, for the past two weeks, we have been unable to test them due to receiving a "0 Unknown HTTP error" on the "Code + Test" tab of the Azure Function.

    Login or Signup to reply.
Please signup or login to give your own answer.

Back To Top
Search