302 HTTP Status Code in ASP.NET Core Web API

302 HTTP Status Code in ASP.NET Core Web API

In this article, I will discuss How to Return 302 “Found” or “Temporary Redirect” HTTP Status Code from the ASP.NET Core Web API Controller Action method with Examples. Please read our previous article discussing How to Return 301 HTTP Status Code in ASP.NET Core Web API with Examples.

302 HTTP Status Code

The HTTP 302 status code is used to indicate a redirection. Specifically, it means “Found” or sometimes referred to as “Temporary Redirect.” When a web server responds with this status code, it tells the client (for example, a web browser) that the requested resource has been temporarily moved to a different URI (Uniform Resource Identifier). Unlike the HTTP 301 status code, which indicates a permanent redirect, a 302 redirect suggests that the redirection might be temporary and the original location should be used for future requests. The following are the key characteristics of the HTTP 302 Status Code:

  • Client Request: The client requests a resource from the server using a specific URI.
  • Server Response with 302: The server responds with a 302 Status Code, indicating that the requested resource temporarily resides at a different URI. The server includes this new URI in the response’s Location header.
  • Client Follows Redirect: The client then makes a new request to the URI provided in the Location header.
  • Server Responds to New Request: The server responds to this new request, potentially with a 200 OK status code if the resource is successfully retrieved.
How Do We Implement a 302 Redirect in ASP.NET Core Web API?

In the context of an ASP.NET Core Web API, a 302 Status Code can redirect a client to a new location for the requested resource. This could be useful in scenarios where the resource’s URI has changed temporarily or when you want to redirect the client to a different endpoint under specific conditions. We can implement this in 3 ways in ASP.NET Core Web API. They are as follows:

  • Using Redirect Method.
  • Manually Creating a RedirectResult with a 302 Status Code.
  • Setting StatusCode and Location Header Manually.
Redirect Method

To implement a 302 redirect in an ASP.NET Core Web API, we can use the Redirect method. The 302 Status Code indicates that the requested resource has been temporarily moved to a different URI. For a better understanding, please modify the Employee Controller as follows:

using Microsoft.AspNetCore.Mvc;
namespace ReturnTypeAndStatusCodes.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmployeeController : ControllerBase
    {
        [HttpGet]
        [Route("OldEndpoint")]
        public IActionResult GetFromOldEndpoint()
        {
            // The URL of the new location for the resource
            //string newUrl = "https://localhost:7128//api/Employee/NewEndpoint";
            string newUrl = Url.Action("GetFromNewEndpoint", "Employee");
            
            //return Redirect("/api/Employee/NewEndpoint");

            // Temporary redirect to the new endpoint
            return Redirect(newUrl);
        }

        [HttpGet]
        [Route("NewEndpoint")]
        public IActionResult GetFromNewEndpoint()
        {
            // Handle the request as usual
            return Ok("This is the new endpoint.");
        }
    }
}

In this example, when a client makes a GET request to /api/Employee/OldEndpoint, the GetFromOldEndpoint method responds with a 302 Status Code and a Location header indicating the URI of the new endpoint (/api/Employee/NewEndpoint). The client is then expected to make a new request to the URI specified in the Location header.

Now, if you make a request to the /API/Employee/OldEndpoint, then the client will get a 302 Temporary Redirect response, and then immediately, it will call the new URL. So, to understand this better, open the Fiddler tool and make a Get Request to the /api/Employee/OldEndpoint URL as shown in the below image:

How to Return 302 Temporary Redirect or Found HTTP Status Code in ASP.NET Core Web API with Examples

Once you click on the Execute button, you will see: First, it will execute the /api/Employee/OldEndpoint URL and will get the 302 response, and then immediately it will execute the /api/Employee/NewEndpoint from where it will get the actual response as shown in the below image:

How to Return 302 Temporary Redirect or Found HTTP Status Code in ASP.NET Core Web API

Now, if you open the /api/Employee/OldEndpoint URL by double-clicking on it, then you will see the following in the Response header, as shown in the image below.

How to Return 302 HTTP Status Code in ASP.NET Core Web API

Now, if you open the /api/Employee/NewEndpoint URL by double-clicking on it, then you will see the actual data in the Response body, as shown in the image below.

302 HTTP Status Code

Note: If you are getting a 302 Status Code, then as a client, you do not need to replace the OLD URL with the new URL.

Manually Creating a RedirectResult with a 302 Status Code:

If you need more control over the response, you can manually create a RedirectResult object and specify the status code explicitly, i.e., you need to set the permanent parameter values to false. For a better understanding, please modify the Employee Controller as follows:

using Microsoft.AspNetCore.Mvc;
namespace ReturnTypeAndStatusCodes.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmployeeController : ControllerBase
    {
        [HttpGet]
        [Route("OldEndpoint")]
        public IActionResult GetFromOldEndpoint()
        {
            // The URL of the new location for the resource
            //string newUrl = "https://localhost:7128//api/Employee/NewEndpoint";
            string newUrl = Url.Action("GetFromNewEndpoint", "Employee");
            // Redirects permanently to the new URL with a 301 HTTP status code

            // Temporary redirect to the new URL with a 301 HTTP status code
            return new RedirectResult(newUrl, permanent: false);
        }

        [HttpGet]
        [Route("NewEndpoint")]
        public IActionResult GetFromNewEndpoint()
        {
            // Handle the request as usual
            return Ok("This is the new endpoint.");
        }
    }
}
Setting StatusCode and Location Header Manually:

For even more control, you can construct the response manually by setting the StatusCode to 302 and the Location header to the temporary redirect URL. For a better understanding, please modify the Employee Controller as follows:

using Microsoft.AspNetCore.Mvc;
namespace ReturnTypeAndStatusCodes.Controllers
{
    [Route("api/[controller]")]
    [ApiController]
    public class EmployeeController : ControllerBase
    {
        [HttpGet]
        [Route("OldEndpoint")]
        public IActionResult GetFromOldEndpoint()
        {
            // The URL of the new location for the resource
            //string newUrl = "https://localhost:7128//api/Employee/NewEndpoint";
            string newUrl = Url.Action("GetFromNewEndpoint", "Employee");

            // Redirects Temporarily to the new URL with a 302 HTTP status code
            Response.StatusCode = 302; // HTTP 302 Redirect Temporarily
            Response.Headers.Location = newUrl;
            return new EmptyResult();
        }

        [HttpGet]
        [Route("NewEndpoint")]
        public IActionResult GetFromNewEndpoint()
        {
            // Handle the request as usual
            return Ok("This is the new endpoint.");
        }
    }
}
When Should We Use 302 HTTP Status Code in ASP.NET Core Web API?

In ASP.NET Core Web API, the HTTP status code 302, known as “Found” or “Temporary Redirect,” indicates that the requested resource temporarily resides at a different URI. Given its temporary nature, this status code is useful in scenarios where the resource’s URI may change in the near future. Here are several scenarios where using a 302 status code is appropriate:

  • Resource Moved Temporarily: If a resource has been moved to a different URI temporarily, a 302 Status Code can redirect the client to the new URI. This is useful in situations where the original URI is undergoing maintenance or is temporarily unavailable.
  • Load Balancing: In a load-balanced environment, a 302 Status Code can redirect clients to different servers based on load, performance, or geographic location. This ensures that no single server is overwhelmed with requests.
  • Conditional Redirection: In scenarios where you need to redirect users based on certain conditions (e.g., language preferences, location, or device type), a 302 Status Code can dynamically redirect users to the most appropriate version of a resource.
  • Authorization: When a user attempts to access a resource that requires authentication, a 302 Status Code can redirect them to a login page. After successful authentication, the user can be redirected back to the original resource.
  • Short-lived Promotional Content: For promoting temporary content or events, a 302 redirect can guide users to the promotional content from a more permanent URL. After the promotion ends, the redirect can be removed, leading users back to the original content.

In the next article, I will discuss How to Return 400 HTTP Status Code in ASP.NET Core Web API with Examples. In this article, I try to explain How to Return 302 Temporary Redirect or Found HTTP Status Code in ASP.NET Core Web API with Examples, and I hope you enjoy this article on “302 Temporary Redirect or Found HTTP Status Code in the ASP.NET Core Web API”.

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