Issue with Custom Middleware in ASP.NET Core 6 - Unexpected Response Status Code
Hey everyone, I'm running into an issue that's driving me crazy... I'm working on a project and hit a roadblock. I'm experimenting with I'm encountering an issue with a custom middleware I've implemented in my ASP.NET Core 6 application. The goal of this middleware is to log the request details and set a custom response header. However, I noticed that the response status code is being altered unexpectedly after my middleware processes the request. Specifically, if the request was successful (status code 200), it gets changed to 500 when the response reaches the client. I've carefully followed the middleware implementation pattern, but I suspect there may be an interaction with other middlewares or how I'm handling the response. Here's a simplified version of my middleware code: ```csharp public class CustomLoggingMiddleware { private readonly RequestDelegate _next; public CustomLoggingMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { // Log request details Console.WriteLine($"Request: {context.Request.Method} {context.Request.Path}"); // Call the next middleware in the pipeline await _next(context); // Attempting to modify response header context.Response.Headers.Add("X-Custom-Header", "MyValue"); // Debugging: Check the status code Console.WriteLine($"Response Status Code: {context.Response.StatusCode}"); } } ``` And I register the middleware in my `Startup.cs` like this: ```csharp public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { app.UseMiddleware<CustomLoggingMiddleware>(); app.UseRouting(); app.UseEndpoints(endpoints => { endpoints.MapControllers(); }); } ``` What I'm seeing in the console is that the status code is correctly logged as 200 right before the response is sent. However, once the response reaches the client, it's being reported as 500. I've also verified that there are no exceptions being thrown during the request processing. The issue persists even when I comment out other middlewares. Has anyone faced a similar issue? What could be causing the response status code to change unexpectedly? Any insights or suggestions would be greatly appreciated! My development environment is Ubuntu. Is there a better approach? The project is a REST API built with C#. Any help would be greatly appreciated! The project is a mobile app built with C#. Is there a better approach? I recently upgraded to C# stable. What are your experiences with this? The project is a mobile app built with C#. Is there a better approach?