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Ensure that the server side is ready

Peter_1985 3,151 Reputation points
2026-02-09T10:04:16.9066667+00:00

Hi,

Further to

https://learn.microsoft.com/en-us/answers/questions/5767226/openapi-issue

how to ensure that the link like

https://localhost:7060/swagger/index.html

is ready to be triggered by the client App (or to receive any command from the client side)?

Developer technologies | ASP.NET | ASP.NET API
Answer accepted by question author
  1. Jack Dang (WICLOUD CORPORATION) 14,955 Reputation points Microsoft External Staff Moderator
    2026-02-10T03:07:15.8133333+00:00

    Hi @Peter_1985 ,

    Thanks for reaching out.

    To clarify the core of the question: the Swagger URL (https://localhost:7060/swagger/index.html) is mainly a human-facing diagnostic page. If that page loads in a browser, it confirms that the server has started successfully and the web host is running, but it’s not something a client app should “trigger” or rely on for communication.

    If the goal is to make sure the server is ready before a client app sends requests, the usual and recommended approach is to expose a very lightweight endpoint (commonly called a health or status endpoint). This endpoint is not created automatically; you need to explicitly add it to your server. Once added, the client can call it first and only proceed once it receives a successful response. This gives the client a clear, machine-friendly signal that the server is up and able to receive commands.

    In practice, the flow looks like this:

    • Start the server.
    • The server finishes initializing and begins listening for requests.
    • A simple readiness endpoint (for example, /health) responds successfully.
    • The client then sends its actual API requests.

    Swagger remaining accessible is a useful manual check during development, but for app-to-app communication, a dedicated health or readiness endpoint that you explicitly define is the reliable way to ensure the server side is ready.

    Hope this helps! If my answer was helpful - kindly follow the instructions here so others with the same problem can benefit as well.

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  1. Bruce (SqlWork.com) 83,581 Reputation points Volunteer Moderator
    2026-02-09T16:13:21.5533333+00:00

    The client should handle connection errors. The only way the client can determine if the server is ready is to successfully call the API.

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  2. Q&A Assist
    2026-02-09T10:04:42.2133333+00:00
    AI generated content. This question contains an answer created with AI from Q&A Assist. Learn more

    To ensure that the server side is ready and the Swagger UI at https://localhost:7060/swagger/index.html can be triggered by the client app, you need to follow these steps:

    1. Run the ASP.NET Core Application: Make sure your ASP.NET Core application is running. You can do this by executing dotnet run in your project directory.
    2. Check Development Environment: Ensure that your application is set to run in the Development environment. This is crucial because the Swagger UI is typically enabled only in development settings. You can check this in your Program.cs file where you configure the middleware: 
         if (app.Environment.IsDevelopment())
   {
       app.UseSwagger();
       app.UseSwaggerUI();
   }
    3. Access the Swagger UI: Once the application is running, navigate to https://localhost:7060/swagger/index.html in your web browser. This should display the Swagger UI, allowing you to interact with your API endpoints.
    4. Client-Side Interaction: Ensure that your client application is configured to make requests to the API endpoints defined in your Swagger documentation. You may want to test the endpoints directly from the Swagger UI to confirm they are operational before integrating them into your client app.
    5. Check for Errors: If you encounter issues, check the console output of your ASP.NET Core application for any errors that may indicate why the Swagger UI is not accessible or why commands from the client side are not being received.

    By following these steps, you can ensure that the server side is ready to receive commands from the client app and that the Swagger UI is accessible for testing your API endpoints.

    References:

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