Question 170581 in ASP.NET Question posted in
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Why am I getting 404 not found in Postman when running a POST API?

For referenece, I have attached the code for Customer Modal, Customer controller (Post request) and postman response,

Customer Controller: (post Req)

     [HttpPost]
     public async Task<ActionResult<Customer>> PostCustomer(Customer customer)
     {
          if (_context.Customers == null)
          {
              return Problem("Entity set 'SalesContext.Customers'  is null.");
          }

          _context.Customers.Add(customer);
          await _context.SaveChangesAsync();

          return CreatedAtAction("GetCustomer", new { id = customer.CustomerID }, customer);
    }

Customer model:

public class Customer
{
    public int CustomerID { get; set; }
    public string Name { get; set; }
    public string Address { get; set; }
}

Postman :

Post request URL: https://localhost:44458/api/Customer_CRUD

Req. Body:

{
    "Name":"abc",
    "Address":"abc"
}

Response : 404 not found

404 not found coming in post request, should come 201

Response code should be 200 in place of 404, not able to identify mistake.

Tags:

2

Answers


  1. 0

    You have to define the route attributes to change the default URL for your controller actions:

    [HttpPost]
[Route("api/Customer_CRUD")]
public async Task<ActionResult<Customer>> PostCustomer(Customer customer)
{
    // your code
}

    If you do not use route annotations in your controller, ASP.NET Core uses a default routing convention. The URL pattern for the default routing convention is {controller}/{action}/{id?}.

    Assuming the controller class name is CustomerController and the action method name is PostCustomer, you would make a POST request to the following URL:

    https://localhost:44458/Customer/PostCustomer
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  2. 0

    Based on the information you provided, it seems like you are trying to send a POST request to an API endpoint for customer CRUD operations. However, without more information about the API endpoint code and configuration, it’s difficult to determine why you might be receiving a 404 error in Postman.

    Here are some possible reasons why you might be receiving a 404 error:

    Incorrect URL: Make sure that the URL you are using in Postman matches the URL of the API endpoint. Double-check that you are using the correct port number and path.

    Missing or incorrect route attribute: Make sure that the API endpoint is decorated with the correct route attribute. For example, if the route attribute is [Route("api/Customer_CRUD")], then the URL in Postman should be https://localhost:/api/Customer_CRUD.

    Authorization or authentication issues: If the API endpoint requires authentication or authorization, make sure that you are providing the correct credentials in Postman.

    Incorrect HTTP method: Make sure that you are using the correct HTTP method (POST) in Postman.

    API endpoint implementation issues: Make sure that the API endpoint code is correctly implemented and that it can handle the request body format and data.

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