303 Redirect: What It Is, How It Works, and When to Use It

HTTP has dozens of status codes, but few cause as much confusion as the 303 redirect. It looks similar to a 301 or 302 on the surface, but it behaves differently in one specific way that matters a lot for form handling and SEO. This article explains what a 303 does, when to use it, and how to track one down in WordPress when it shows up where you didn't expect it.

Key Takeaways

• A 303 status code means "See Other" and always forces the browser to switch to a GET request, no matter what method the original request used.
• The Post/Redirect/Get pattern is why the 303 exists, and it's the mechanism that stops WordPress forms from submitting twice on page refresh.
• WordPress developers use wp_redirect and wp_safe_redirect to issue 303 responses, and WooCommerce relies on this behavior during checkout.
• A 303 is the right tool for temporary, method-switching redirects and the wrong tool for permanent URL changes or passing SEO value.
• Get answers to the most common questions about 303 redirects, including SEO impact and how to fix unexpected ones.

What "303 See Other" Means and How It Differs from Other Redirects

The phrase "303 See Other" comes from the HTTP specification. It tells the browser one thing: the response to your request is at a different URL, and you should go there using a GET request. HTTP 303 is part of the 3xx family, which covers all redirect responses. What separates the codes within that family is how they handle two questions: is the move permanent, and does the browser keep the original request method?

When a server sends a 303, it includes a Location header. That header holds the destination URL. The browser reads it, drops whatever method it used originally (POST, PUT, DELETE, or anything else), and sends a GET request to the new URL. That switch always happens. There's no browser setting or server configuration that changes this behavior.

Is HTTP 303 the Same as a Temporary Redirect?

HTTP 303 is temporary. It tells the browser where to go now but doesn't signal that the original URL has moved permanently, so neither browsers nor search engines update their records.

This is where 303 separates from 301. A 301 is permanent. It tells search engines the original URL has moved for good, and it passes SEO equity to the destination. A 303 passes nothing. Search engines keep the original URL as canonical and don't credit the destination with any of the original page's ranking signals.

A 302 is also temporary, but the HTTP spec says it may preserve the original request method. Many older browsers switched to GET anyway, which created inconsistency. A 303 removes that inconsistency by requiring a GET switch every time, with no exceptions.

A 307 does the opposite. It preserves the original method. POST to a URL and get a 307 back, and the browser re-sends that POST to the new location. POST to a URL and get a 303, and the browser sends a GET instead. That difference is what makes 303 the right choice for form handling and 307 the right choice when you need the method to carry through.

The 308 is the permanent version of 307. It preserves the method and signals a permanent move. Here's how all five codes compare:

| Code | Permanent? | Preserves Method? |

|---|---|---|

| 301 | Yes | No |

| 302 | No | Sometimes |

| 303 | No | No (always GET) |

| 307 | No | Yes |

| 308 | Yes | Yes |

The Post/Redirect/Get Pattern, SEO Implications, and Crawl Budget

The Post/Redirect/Get pattern is the main reason the 303 redirect exists. Here's the sequence: a user fills out a form and submits it (a POST request). The server processes the data. Instead of returning a response page directly, the server sends a 303 redirect to a confirmation or results page. The browser follows that redirect with a GET request and shows the page. If the user hits refresh, the browser repeats the GET, not the original POST. No duplicate form submission occurs.

Without this pattern, refreshing after a form submission triggers a browser warning asking the user to confirm the resubmit. That's a poor experience at the best of times. In WooCommerce, it's a real risk. A duplicate order submission can mean a customer gets charged twice. The redirect after form submission breaks that cycle.

Does a 303 Redirect Pass SEO Value?

A 303 redirect does not reliably pass link equity to the destination URL. Search engines treat it as temporary, so the original URL stays canonical in their index.

For permanent URL changes on a WordPress site, this matters. If you move a page and send a 303 instead of a 301, search engines keep crawling the old URL. Any links pointing to the original page don't pass their value to the new one. Over time, that wastes crawl budget and leaves ranking potential sitting at a URL you're no longer using.

Crawl budget is a practical concern for sites with hundreds of pages. Search engine crawlers make a limited number of requests to your site in any given period. Redirect chains that include unnecessary 303 responses make crawlers follow extra hops before reaching actual content. Each extra hop uses part of that budget without delivering anything indexable. A redirect audit that flags 303 responses in chains is a useful step for larger sites.

REST APIs use 303 in a similar way to the PRG pattern. When a POST request creates a new resource, the API can return a 303 pointing to that resource's URL. The client follows the redirect with a GET and retrieves the resource. This is correct behavior in that context. API endpoints aren't typically indexed by search engines, so the SEO concern doesn't apply.

The practical rule: use a 303 when you need a temporary, method-switching redirect. Use a 301 when you want search engines to treat the destination as the permanent home for a URL.

wp_redirect, WooCommerce, and Troubleshooting 303s in WordPress

WordPress gives you two built-in functions for sending redirects from PHP: wp_redirect() and wp_safe_redirect(). Both take a URL and an optional status code. Without a status code, wp_redirect() sends a 302. To send a 303, pass the code as the second argument.

wp_redirect( $url, 303 );
exit;

The exit call is not optional. Without it, PHP keeps running the rest of your script after sending the redirect header, which can produce unexpected output in the response. The wp_safe_redirect() function works the same way but checks the destination URL against a list of allowed hosts before sending the redirect. If the URL isn't on that list, WordPress blocks it. Use wp_safe_redirect() any time the destination URL could come from user input.

How to Detect and Fix an Unexpected 303 Redirect

Open browser DevTools, go to the Network tab, and load the URL. Any 303 response shows up as a row in that list. Click the row and check the response headers. The Location header tells you exactly where the redirect is pointing.

From the command line, curl works just as well.

curl -I https://example.com/your-url

This prints the response headers without downloading the page body. The status code and Location value appear at the top.

WooCommerce uses redirect-after-submit behavior throughout its checkout flow. After an order is placed, WooCommerce sends the browser to a thank-you page using a redirect. That's intentional. If you see a 303 in a WooCommerce checkout flow, it's almost certainly working as designed. The case that needs attention is a 303 showing up on a URL that isn't part of any form or checkout process.

The most common causes of unexpected 303 redirects in WordPress are plugin conflicts (two plugins both trying to redirect the same request), theme functions that fire redirects during template loading, and server-level rules in Nginx or Apache that match URL patterns before WordPress runs. That last cause is worth checking first. A server-level redirect rule produces a 303 that won't appear in any WordPress plugin's logs because WordPress never processes the request.

Redirect chains are a performance issue separate from the redirect type. A chain forms when one redirect points to another before reaching the final destination. Browsers don't cache 303 redirects, so every visit to the original URL triggers the full chain again. Each hop adds a round trip. Flattening a chain to a single redirect removes that latency and makes redirect behavior easier to audit.

If a 303 should be permanent, replace it with a 301. If it's part of a PRG flow, it belongs there. The goal is to make sure every 303 on your site is doing a specific job.

The Bottom Line

The 303 redirect has a specific job: send the browser to a new URL using a GET request, temporarily, without passing SEO equity. It's the right tool for the Post/Redirect/Get pattern and the wrong tool for permanent URL moves. Knowing the difference between 303, 301, 302, 307, and 308 saves you from redirect decisions that quietly hurt your site's SEO or create form submission bugs that are hard to trace. If you want to talk through how redirect behavior applies to your specific setup,

FAQs

What is the difference between a 303 and a 301 redirect?

A 301 is permanent and passes link equity to the destination. A 303 is temporary and passes nothing. A 303 also always forces the browser to use a GET request. Use a 301 when a URL has moved for good. Use a 303 when you need the Post/Redirect/Get pattern for form handling.

Does a 303 redirect pass SEO value to the destination URL?

It doesn't. Search engines treat a 303 as temporary and keep the original URL as canonical. Any link equity built at the original URL stays there. If you need ranking signals to follow a URL change, use a 301 instead.

Why does a 303 redirect always use a GET request?

The HTTP specification defines this behavior. A 303 tells the browser that the response to the original request exists at a different URL and should be retrieved with a GET. This applies regardless of whether the original request was a POST, PUT, or DELETE.

Why is my WordPress site returning an unexpected 303 redirect?

The most common causes are plugin conflicts, theme functions that issue redirects during template loading, and server-level rules in Nginx or Apache that run before WordPress processes the request. Start by checking your server configuration, then deactivate plugins one at a time to find the source.

How do I set a 303 redirect in WordPress using wp_redirect?

Call wp_redirect( $url, 303 ) and follow it immediately with exit. If the destination URL comes from user input, use wp_safe_redirect( $url, 303 ) instead. That function checks the destination against a list of trusted hosts before sending the redirect.