How to fix this error "warn: Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3] Failed to determine the https port for redirect."

Question

Good evening , I am trying to build a simple web api using ASP.Net . The app has been showing the error like this after building it -

warn: Microsoft.AspNetCore.HttpsPolicy.HttpsRedirectionMiddleware[3]
      Failed to determine the https port for redirect.

I have built according to this documentation-
https://learn.microsoft.com/en-in/training/modules/build-web-api-aspnet-core/3-exercise-create-web-api

Answer 1

In the launchSettings.json file, move the https property to the top of the http property. Both of them will work and http requests will be redirected to the https port (as long as you don't disable the UseHttpsRedirection() in the Program.cs file).

Answer 2

Hi all,

I would like to make a contribution to this thread since I've also been wrestling with this issue for a few days now and wanted to solve it on my own without entrusting or handling it to Copilot, Alexa or any assistant of any sort so I did some research.

Bluntly:

The First step is to install Swashbuckle package following the steps form MS learn:

https://learn.microsoft.com/en-us/aspnet/core/tutorials/getting-started-with-swashbuckle?view=aspnetcore-8.0&tabs=visual-studio-code

The Second step is to Trust the HTTPS development certificate by running

 dotnet dev-certs https --trust

in Powershell as an admin. I was running the command in the VS Code terminal and wasn't working (Learn more at ASP.NET docs https://learn.microsoft.com/en-us/aspnet/core/tutorials/first-web-api?view=aspnetcore-9.0&tabs=visual-studio-code).

The Third step is to launch the application with

dotnet run --launch-profile https

Reference:

https://www.linkedin.com/pulse/fixing-https-issues-aspnet-core-say-goodbye-your-isnt-lokesh-1qtwc/

I hope it works also for you.

Regards,

Ch.-

Answer 3

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