Difficulty Implementing a Custom Middleware for handling Handling in ASP.NET Core 6
I tried several approaches but none seem to work. I'm trying to implement a custom middleware for handling exceptions globally in my ASP.NET Core 6 application, but I'm running into issues with the response format. My goal is to catch exceptions, log them, and return a structured JSON response instead of the default behavior page. I created a middleware class as follows: ```csharp public class ExceptionHandlingMiddleware { private readonly RequestDelegate _next; public ExceptionHandlingMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { try { await _next(context); } catch (Exception ex) { await HandleExceptionAsync(context, ex); } } private Task HandleExceptionAsync(HttpContext context, Exception ex) { context.Response.ContentType = "application/json"; context.Response.StatusCode = (int)HttpStatusCode.InternalServerError; var result = JsonSerializer.Serialize(new { behavior = ex.Message, stackTrace = ex.StackTrace }); return context.Response.WriteAsync(result); } } ``` I registered this middleware in my `Startup.cs` like this: ```csharp public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { app.UseMiddleware<ExceptionHandlingMiddleware>(); // Other middlewares } ``` However, whenever an exception is thrown, I am getting a `500 Internal Server behavior` but the response is empty instead of my structured JSON. I've confirmed that the exception is being caught in the `catch` block, but nothing is written to the response. I've also checked that `app.UseMiddleware<ExceptionHandlingMiddleware>()` is being executed. Another thing I noticed is that the `HttpContext` might be getting modified by some other middleware after my exception handler is invoked. Is there something I'm missing here? Any insights or suggestions would be greatly appreciated! My development environment is Windows 10.