How to prevent ASP.NET Core from returning the same result on consecutive POST requests?
I'm updating my dependencies and I tried several approaches but none seem to work. I'm sure I'm missing something obvious here, but I'm working on an ASP.NET Core 6.0 application that processes POST requests to create new user accounts... I've noticed that when I submit the same form multiple times in quick succession, the application sends back the same result each time, rather than processing these requests individually. I want to ensure that each submission is treated as a unique request, even if the user clicks the submit button multiple times. I've tried using the `IActionResult` in my controller method as follows: ```csharp [HttpPost] public async Task<IActionResult> CreateUser(UserModel model) { if (!ModelState.IsValid) { return View(model); } var existingUser = await _userService.GetUserByEmailAsync(model.Email); if (existingUser != null) { ModelState.AddModelError("Email", "Email already exists."); return View(model); } // Create user await _userService.CreateUserAsync(model); return RedirectToAction("UserCreated"); } ``` However, when I submit the form multiple times rapidly, the application still seems to process only the first request, and I get a message saying "User already exists" even for new submissions. I also tried implementing a `using` statement with a lock around the user creation logic, but it doesn't seem to resolve the scenario. I'm unsure whether this is due to how ASP.NET Core handles requests or if it's something in my application logic. Any suggestions on how to handle this scenario more gracefully, ensuring that each POST request processes independently? Has anyone else encountered this? This is for a desktop app running on CentOS. Is there a simpler solution I'm overlooking? I'm coming from a different tech stack and learning C#. Any ideas how to fix this?