What is 303 See Other?

The 303 See Other is an HTTP response status code indicating that the server is redirecting the client to a different resource than the one originally requested. When a client receives a 303 status, it means the server has completed the request successfully but wants the client to retrieve the response from a different URL specified in the Location header. 

The 303 HTTP response is commonly used after POST, PUT, or DELETE operations to redirect users to a success page or confirmation message rather than showing the result directly. Unlike other redirect codes, the 303 See Other response explicitly requires the client to use a GET request to access the new location.

What Causes the 303 See Other?

Several scenarios can trigger a 303 error code:

1. Form Submissions: After processing a POST request from a form submission, the server redirects to a confirmation page.
2. Resource Creation: When creating new resources through PUT requests, the server redirects to the newly created resource’s view page.
3. API Operations: Following successful DELETE or modification operations, the server redirects to a status page.
4. Resource Relocation: When the requested resource has been temporarily moved to a different URL.

Example

Request:

POST /submit-form HTTP/2.0

Host: example.com

Content-Type: application/x-www-form-urlencoded

Content-Length: 67

username=johndoe&action=create_account

Response:

HTTP/2.0 303 See Other

Location: /confirmation/account-created

Cache-Control: no-cache

Content-Length: 0

In this example, when a user submits a form to create an account, instead of directly returning the result, the server sends a 303 HTTP response with a Location header pointing to a confirmation page. 

The client’s browser will automatically make a new GET request to /confirmation/account-created to show the user the result of their account creation request.

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