implementing Custom Middleware in ASP.NET Core 6 Handling Requests and Responses
I'm wondering if anyone has experience with I'm working on a project and hit a roadblock. I'm experimenting with After trying multiple solutions online, I still can't figure this out. I'm having trouble with a custom middleware that I implemented in my ASP.NET Core 6 application. The middleware is supposed to log request details and modify the response if certain conditions are met. However, I'm working with an scenario where sometimes the response is not being returned correctly, and I see the behavior `HttpContext.Response has already started` in my logs. Here's a simplified version of my middleware: ```csharp public class CustomLoggingMiddleware { private readonly RequestDelegate _next; public CustomLoggingMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { // Log information Console.WriteLine($"Request Path: {context.Request.Path}"); // Modify response based on a condition if (context.Request.Path.StartsWith("/api/some-secure-endpoint")) { context.Response.StatusCode = 403; await context.Response.WriteAsync("Access Denied"); return; } await _next(context); } } ``` The question arises when the middleware gets invoked for certain endpoints that are not meant to be intercepted. In those cases, I expect the request to pass through to the next middleware. However, sometimes I'm still getting the aforementioned behavior when I try to access a different API endpoint, even though I don't explicitly modify the response. I've also made sure to add the middleware in the correct order within the `Configure` method in `Startup.cs`: ```csharp public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { app.UseMiddleware<CustomLoggingMiddleware>(); app.UseRouting(); app.UseAuthorization(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); } ``` I've tried surrounding the `_next(context)` call with a `try-catch` block to log more information but didn't find any exceptions thrown. Can the order of middleware affect whether the response starts? What can cause this behavior, and how can I ensure that my middleware functions correctly without interfering with other requests? My development environment is Ubuntu 22.04. Cheers for any assistance! I recently upgraded to Csharp latest. Any examples would be super helpful. I'd really appreciate any guidance on this. I'm on Ubuntu 20.04 using the latest version of Csharp. I'd love to hear your thoughts on this.