Application exception when trying to get response from server

Question

Register.cshtml

1.

   
                      
   ``````xml
            <button type="submit" class="btn btn-outline-primary btn-sm ml-4 mt-4" asp-page-handler="GenerateOtp" style=" width: 150px;" disabled="@Model.OtpProcessing">
                                   @if (Model.OtpProcessing)
                                   {
                                       <div class="spinner-border spinner-border-sm" role="status">
                                           <span class="visually-hidden">Loading...</span>
                                       </div>
                                       <span>GENERATING</span>
                                   }
                                   else
                                   {
                                       <span>GENERATE OTP</span>
                                   }
                               </button>

Register.cshtml.cs

public void OnGet()
{
if (!string.IsNullOrEmpty(LoginPhoneNumber))
{
    IsPhoneNumberPresent = true;
    //LoginModel = new OtpRegisterVm { Username = LoginPhoneNumber, CountryCode = CountryCode };
}
else
{
    IsPhoneNumberPresent = false;
}
}
public async Task<IActionResult> OnPostGenerateOtpAsync()
{
OtpProcessing = true;
if (string.IsNullOrEmpty(LoginModel.Username))
{
    Notify.Add(TempData, false, "", "Phone Number required");
    OtpProcessing = false;
    return Page();
}
else if (LoginModel.Username.Length < 10)
{
    Notify.Add(TempData, false, "", "Enter valid Phone Number");
    OtpProcessing = false;
    return Page();
}
// Display success message
//Notify.Add(TempData, true, $"OTP Generated successfully: {generatedOtp}", "");
var dto = new PhoneNumberDto { PhoneNumber = LoginModel.CountryCode + LoginModel.Username };
var response = await _apiService.GenerateRegisterOtp(dto);
if (response.IsSuccess)
{
    Notify.Add(TempData, true, "OTP Generated successfully", "");
}
else
{
    Notify.Add(TempData, false, "", response.Message);
}
OtpProcessing = false;
return RedirectToPage("/Auth/RegistrationForm");
}

Service.cs

public async Task<ResponseDto<string>> GenerateRegisterOtp(PhoneNumberDto dto)
{
var httpResponse = await _httpService.Post<PhoneNumberDto, ResponseDto<string>>(
    "/api/identity/generateregisterotp", dto);
var responseBody = await httpResponse.GetBody();
if (string.IsNullOrEmpty(responseBody))
{
    throw new ApplicationException("Empty response received from /api/identity/generateregisterotp.");
}
if (!httpResponse.Success)
    //throw new ApplicationException(await httpResponse.GetBody());
    throw new ApplicationException($"API returned an error: {responseBody}");
return httpResponse.Response;
}

Controller

[AllowAnonymous]
[HttpPost("generateregisterotp")]
public async Task<ResponseDto<string>> GenerateRegisterOTP(PhoneNumberDto phoneNumber)
{
 try
 {
     var existingUser = await _context.GetAppUserByUsername(phoneNumber.PhoneNumber);
     if (existingUser != null)
     {
         return new ResponseDto<string>(false, $"The {phoneNumber.PhoneNumber} is already registered");
     }
     var otp = new Random().Next(111947, 999999).ToString();
     var result = await _context.RegisterSetOtpAsync(phoneNumber.PhoneNumber, otp);
     if (result)
     {
         //await SendSms(phoneNumber, otp);
         return new ResponseDto<string>(true, $"OTP sent successfully");
     }
 }
 catch (Exception ex)
 {
     return new ResponseDto<string>(false, ex.Message);
 }
 return new ResponseDto<string>(false, "Server is not responding");
}

While generating OTP for new user, I am facing this issue of Status 404 error - HttpResponseMessage = {StatusCode: 404, ReasonPhrase: 'Not Found', Version: 1.1, Content: System.Net.Http.HttpConnectionResponseContent, Headers:

Answer 1

Hi @Surya Chandra Mohan,

Not sure how is your Controller name, but for your request url is: api/Identity/xxx , you need declare the Route attribute like below:

[Route("api/Identity")]
public class YourController:ControllerBase
{
    //....
}

If your Controller is named IdentityController, you can also declare the Route attribute like below:

[Route("api/[controller]")]
public class IdentityController:ControllerBase
{
    //...
}

Also be sure register the service and use the route middleware like below:

builder.Services.AddControllers();   //be sure add this...
builder.Services.AddRazorPages();
//other services....

app.UseRouting();
//other middleware...
app.MapRazorPages();
app.MapControllers();     //be sure add this...

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Best regards,
Rena