How can I set a default handler for urls that don't match any endpoints?-CodePudding

I'm dealing with a ASP.NET Core Web API program.
As we all know, when the url doesn't match any endpoints, the server will automatically return 404 code.

Now that I want the service to record these requests into a log, so I want to set a default handler for them.
Is it possible? How?

CodePudding user response：

To set a default handler for URLs that don't match any endpoints, you can use the UseStatusCodePagesWithReExecute middleware in your ASP.NET Core Web API project.

Here is an example of how you can use this middleware:

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseStatusCodePagesWithReExecute("/error/{0}");

    // Other middleware and configuration
}

In this example, the UseStatusCodePagesWithReExecute middleware is used to handle any requests that result in a HTTP status code of 404 (not found). This middleware will re-execute the request and pass the status code to the specified URL (/error/{0} in this example), where you can handle it and log the request as needed.

You can also use this middleware to handle other HTTP status codes by specifying them in the call to UseStatusCodePagesWithReExecute. For example, the following code will handle both 404 and 500 HTTP status codes:

app.UseStatusCodePagesWithReExecute("/error/{0}", "404,500");

CodePudding user response：

Yes, it is possible. You can create a custom middleware to log all requests that don't match any endpoint. The middleware should catch all requests, and log them before they are passed on to the 404 handler. You can create the middleware by implementing the IMiddleware interface and adding it to the request pipeline in the Configure method of the Startup class.