Скачать или смотреть Solving the System.InvalidOperationException in .NET Core on Digital Ocean's App Platform

Discover how to resolve the `Unable to configure HTTPS endpoint` error while deploying a .NET Core application on Digital Ocean's App Platform with practical steps and coding tips.
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This video is based on the question https://stackoverflow.com/q/75606096/ asked by the user 'Pavle Ćurčić' ( https://stackoverflow.com/u/12893829/ ) and on the answer https://stackoverflow.com/a/75655342/ provided by the user 'Pavle Ćurčić' ( https://stackoverflow.com/u/12893829/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the System.InvalidOperationException in .NET Core on Digital Ocean's App Platform

When deploying your .NET Core application on Digital Ocean's App Platform, encountering an Unhandled exception can be quite frustrating. Specifically, you might face the System.InvalidOperationException, stating that it is Unable to configure HTTPS endpoint. No server certificate was specified, and the default developer certificate could not be found or is out of date.

This error commonly arises due to misconfigurations regarding HTTPS setup. In this guide, we will walk through a simple and effective solution to overcome this issue and successfully deploy your .NET Core application.

Understanding the Problem

The error indicates that the application does not have a valid HTTPS configuration. This is essential for web applications as it secures the data transmitted between the user's browser and the server. Here are some underlying reasons for this issue:

No server certificate specified: Your application requires a valid SSL/TLS certificate to configure HTTPS properly.

Developer certificate issues: The default developer certificate might be outdated or missing, leading to the inability to serve content over HTTPS.

A Practical Solution

Instead of diving deep into certificates and HTTPS setup, there's a straightforward workaround that involves adapting your application to use HTTP-only traffic. This adjustment allows the App Platform to manage security without requiring additional configuration within your app. Here's how you can do this.

Step 1: Modify the Docker Configuration

Open your Docker settings and locate the Docker profile inside your launchsettings.json. Your configuration should look somewhat like this:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Remove HTTPS References

Make sure to remove any references to HTTPS in the ASPNETCORE_URLS variable:

From https://+:80; to http://+:80;

Step 3: Adjust Program.cs

Next, remove the line that calls app.UseHttpsRedirection(); in your Program.cs file. This line forces the application to only respond to HTTPS requests, which isn't required in this context since the App Platform will manage these settings.

Here's what to look for and omit:

[[See Video to Reveal this Text or Code Snippet]]

Rationale Behind the Change

By making these changes:

HTTP handling by App Platform: Digital Ocean’s App Platform automatically handles HTTPS, so your application doesn't need to be responsible for configuring it.

Simplified deployment: You eliminate the complexity and potential pitfalls of configuring HTTPS in your application.

Conclusion

If you ever find yourself grappling with an InvalidOperationException while deploying your .NET Core applications on Digital Ocean, consider stripping away HTTPS configurations and allowing the App Platform to manage them. Implementing the steps above should resolve your issues and pave the way for a successful deployment.

Should you face further problems after these adjustments, feel free to reach out for additional assistance. Happy coding!