Код ошибки 303 http

From Wikipedia, the free encyclopedia

This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client’s request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status code specifies one of five standard classes of responses. The optional message phrases shown are typical, but any human-readable alternative may be provided, or none at all.

Unless otherwise stated, the status code is part of the HTTP standard (RFC 9110).

The Internet Assigned Numbers Authority (IANA) maintains the official registry of HTTP status codes.^[1]

All HTTP response status codes are separated into five classes or categories. The first digit of the status code defines the class of response, while the last two digits do not have any classifying or categorization role. There are five classes defined by the standard:

• 1xx informational response – the request was received, continuing process
• 2xx successful – the request was successfully received, understood, and accepted
• 3xx redirection – further action needs to be taken in order to complete the request
• 4xx client error – the request contains bad syntax or cannot be fulfilled
• 5xx server error – the server failed to fulfil an apparently valid request

1xx informational response

An informational response indicates that the request was received and understood. It is issued on a provisional basis while request processing continues. It alerts the client to wait for a final response. The message consists only of the status line and optional header fields, and is terminated by an empty line. As the HTTP/1.0 standard did not define any 1xx status codes, servers must not^{[note 1]} send a 1xx response to an HTTP/1.0 compliant client except under experimental conditions.

100 Continue

The server has received the request headers and the client should proceed to send the request body (in the case of a request for which a body needs to be sent; for example, a POST request). Sending a large request body to a server after a request has been rejected for inappropriate headers would be inefficient. To have a server check the request’s headers, a client must send Expect: 100-continue as a header in its initial request and receive a 100 Continue status code in response before sending the body. If the client receives an error code such as 403 (Forbidden) or 405 (Method Not Allowed) then it should not send the request’s body. The response 417 Expectation Failed indicates that the request should be repeated without the Expect header as it indicates that the server does not support expectations (this is the case, for example, of HTTP/1.0 servers).^[2]

101 Switching Protocols

The requester has asked the server to switch protocols and the server has agreed to do so.

102 Processing (WebDAV; RFC 2518)

A WebDAV request may contain many sub-requests involving file operations, requiring a long time to complete the request. This code indicates that the server has received and is processing the request, but no response is available yet.^[3] This prevents the client from timing out and assuming the request was lost. The status code is deprecated.^[4]

103 Early Hints (RFC 8297)

Used to return some response headers before final HTTP message.^[5]

2xx success

This class of status codes indicates the action requested by the client was received, understood, and accepted.^[1]

200 OK

Standard response for successful HTTP requests. The actual response will depend on the request method used. In a GET request, the response will contain an entity corresponding to the requested resource. In a POST request, the response will contain an entity describing or containing the result of the action.

201 Created

The request has been fulfilled, resulting in the creation of a new resource.^[6]

202 Accepted

The request has been accepted for processing, but the processing has not been completed. The request might or might not be eventually acted upon, and may be disallowed when processing occurs.

203 Non-Authoritative Information (since HTTP/1.1)

The server is a transforming proxy (e.g. a Web accelerator) that received a 200 OK from its origin, but is returning a modified version of the origin’s response.^[7][8]

204 No Content

The server successfully processed the request, and is not returning any content.

205 Reset Content

The server successfully processed the request, asks that the requester reset its document view, and is not returning any content.

206 Partial Content

The server is delivering only part of the resource (byte serving) due to a range header sent by the client. The range header is used by HTTP clients to enable resuming of interrupted downloads, or split a download into multiple simultaneous streams.

207 Multi-Status (WebDAV; RFC 4918)

The message body that follows is by default an XML message and can contain a number of separate response codes, depending on how many sub-requests were made.^[9]

208 Already Reported (WebDAV; RFC 5842)

The members of a DAV binding have already been enumerated in a preceding part of the (multistatus) response, and are not being included again.

226 IM Used (RFC 3229)

The server has fulfilled a request for the resource, and the response is a representation of the result of one or more instance-manipulations applied to the current instance.^[10]

3xx redirection

This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection.^[1]

A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD. A user agent may automatically redirect a request. A user agent should detect and intervene to prevent cyclical redirects.^[11]

300 Multiple Choices

Indicates multiple options for the resource from which the client may choose (via agent-driven content negotiation). For example, this code could be used to present multiple video format options, to list files with different filename extensions, or to suggest word-sense disambiguation.

301 Moved Permanently

This and all future requests should be directed to the given URI.

302 Found (Previously «Moved temporarily»)

Tells the client to look at (browse to) another URL. The HTTP/1.0 specification (RFC 1945) required the client to perform a temporary redirect with the same method (the original describing phrase was «Moved Temporarily»),^[12] but popular browsers implemented 302 redirects by changing the method to GET. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviours.^[11]

303 See Other (since HTTP/1.1)

The response to the request can be found under another URI using the GET method. When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should issue a new GET request to the given URI.

304 Not Modified

Indicates that the resource has not been modified since the version specified by the request headers If-Modified-Since or If-None-Match. In such case, there is no need to retransmit the resource since the client still has a previously-downloaded copy.

305 Use Proxy (since HTTP/1.1)

The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code.

306 Switch Proxy

No longer used. Originally meant «Subsequent requests should use the specified proxy.»

307 Temporary Redirect (since HTTP/1.1)

In this case, the request should be repeated with another URI; however, future requests should still use the original URI. In contrast to how 302 was historically implemented, the request method is not allowed to be changed when reissuing the original request. For example, a POST request should be repeated using another POST request.

308 Permanent Redirect

This and all future requests should be directed to the given URI. 308 parallel the behaviour of 301, but does not allow the HTTP method to change. So, for example, submitting a form to a permanently redirected resource may continue smoothly.

4xx client errors

This class of status code is intended for situations in which the error seems to have been caused by the client. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. These status codes are applicable to any request method. User agents should display any included entity to the user.

400 Bad Request

The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax, size too large, invalid request message framing, or deceptive request routing).

401 Unauthorized

Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided. The response must include a WWW-Authenticate header field containing a challenge applicable to the requested resource. See Basic access authentication and Digest access authentication. 401 semantically means «unauthorised», the user does not have valid authentication credentials for the target resource.

Some sites incorrectly issue HTTP 401 when an IP address is banned from the website (usually the website domain) and that specific address is refused permission to access a website.^{[citation needed]}

402 Payment Required

Reserved for future use. The original intention was that this code might be used as part of some form of digital cash or micropayment scheme, as proposed, for example, by GNU Taler,^[14] but that has not yet happened, and this code is not widely used. Google Developers API uses this status if a particular developer has exceeded the daily limit on requests.^[15] Sipgate uses this code if an account does not have sufficient funds to start a call.^[16] Shopify uses this code when the store has not paid their fees and is temporarily disabled.^[17] Stripe uses this code for failed payments where parameters were correct, for example blocked fraudulent payments.^[18]

403 Forbidden

The request contained valid data and was understood by the server, but the server is refusing action. This may be due to the user not having the necessary permissions for a resource or needing an account of some sort, or attempting a prohibited action (e.g. creating a duplicate record where only one is allowed). This code is also typically used if the request provided authentication by answering the WWW-Authenticate header field challenge, but the server did not accept that authentication. The request should not be repeated.

404 Not Found

The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.

405 Method Not Allowed

A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only resource.

406 Not Acceptable

The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request. See Content negotiation.

407 Proxy Authentication Required

The client must first authenticate itself with the proxy.

408 Request Timeout

The server timed out waiting for the request. According to HTTP specifications: «The client did not produce a request within the time that the server was prepared to wait. The client MAY repeat the request without modifications at any later time.»

409 Conflict

Indicates that the request could not be processed because of conflict in the current state of the resource, such as an edit conflict between multiple simultaneous updates.

410 Gone

Indicates that the resource requested was previously in use but is no longer available and will not be available again. This should be used when a resource has been intentionally removed and the resource should be purged. Upon receiving a 410 status code, the client should not request the resource in the future. Clients such as search engines should remove the resource from their indices. Most use cases do not require clients and search engines to purge the resource, and a «404 Not Found» may be used instead.

411 Length Required

The request did not specify the length of its content, which is required by the requested resource.

412 Precondition Failed

The server does not meet one of the preconditions that the requester put on the request header fields.

413 Payload Too Large

The request is larger than the server is willing or able to process. Previously called «Request Entity Too Large» in RFC 2616.^[19]

414 URI Too Long

The URI provided was too long for the server to process. Often the result of too much data being encoded as a query-string of a GET request, in which case it should be converted to a POST request. Called «Request-URI Too Long» previously in RFC 2616.^[20]

415 Unsupported Media Type

The request entity has a media type which the server or resource does not support. For example, the client uploads an image as image/svg+xml, but the server requires that images use a different format.

416 Range Not Satisfiable

The client has asked for a portion of the file (byte serving), but the server cannot supply that portion. For example, if the client asked for a part of the file that lies beyond the end of the file. Called «Requested Range Not Satisfiable» previously RFC 2616.^[21]

417 Expectation Failed

The server cannot meet the requirements of the Expect request-header field.^[22]

418 I’m a teapot (RFC 2324, RFC 7168)

This code was defined in 1998 as one of the traditional IETF April Fools’ jokes, in RFC 2324, Hyper Text Coffee Pot Control Protocol, and is not expected to be implemented by actual HTTP servers. The RFC specifies this code should be returned by teapots requested to brew coffee.^[23] This HTTP status is used as an Easter egg in some websites, such as Google.com’s «I’m a teapot» easter egg.^[24][25][26] Sometimes, this status code is also used as a response to a blocked request, instead of the more appropriate 403 Forbidden.^[27][28]

421 Misdirected Request

The request was directed at a server that is not able to produce a response (for example because of connection reuse).

422 Unprocessable Entity

The request was well-formed but was unable to be followed due to semantic errors.^[9]

423 Locked (WebDAV; RFC 4918)

The resource that is being accessed is locked.^[9]

424 Failed Dependency (WebDAV; RFC 4918)

The request failed because it depended on another request and that request failed (e.g., a PROPPATCH).^[9]

425 Too Early (RFC 8470)

Indicates that the server is unwilling to risk processing a request that might be replayed.

426 Upgrade Required

The client should switch to a different protocol such as TLS/1.3, given in the Upgrade header field.

428 Precondition Required (RFC 6585)

The origin server requires the request to be conditional. Intended to prevent the ‘lost update’ problem, where a client GETs a resource’s state, modifies it, and PUTs it back to the server, when meanwhile a third party has modified the state on the server, leading to a conflict.^[29]

429 Too Many Requests (RFC 6585)

The user has sent too many requests in a given amount of time. Intended for use with rate-limiting schemes.^[29]

431 Request Header Fields Too Large (RFC 6585)

The server is unwilling to process the request because either an individual header field, or all the header fields collectively, are too large.^[29]

451 Unavailable For Legal Reasons (RFC 7725)

A server operator has received a legal demand to deny access to a resource or to a set of resources that includes the requested resource.^[30] The code 451 was chosen as a reference to the novel Fahrenheit 451 (see the Acknowledgements in the RFC).

5xx server errors

The server failed to fulfil a request.

Response status codes beginning with the digit «5» indicate cases in which the server is aware that it has encountered an error or is otherwise incapable of performing the request. Except when responding to a HEAD request, the server should include an entity containing an explanation of the error situation, and indicate whether it is a temporary or permanent condition. Likewise, user agents should display any included entity to the user. These response codes are applicable to any request method.

500 Internal Server Error

A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.

501 Not Implemented

The server either does not recognize the request method, or it lacks the ability to fulfil the request. Usually this implies future availability (e.g., a new feature of a web-service API).

502 Bad Gateway

The server was acting as a gateway or proxy and received an invalid response from the upstream server.

503 Service Unavailable

The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state.^[31]

504 Gateway Timeout

The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.

505 HTTP Version Not Supported

The server does not support the HTTP version used in the request.

506 Variant Also Negotiates (RFC 2295)

Transparent content negotiation for the request results in a circular reference.^[32]

507 Insufficient Storage (WebDAV; RFC 4918)

The server is unable to store the representation needed to complete the request.^[9]

508 Loop Detected (WebDAV; RFC 5842)

The server detected an infinite loop while processing the request (sent instead of 208 Already Reported).

510 Not Extended (RFC 2774)

Further extensions to the request are required for the server to fulfil it.^[33]

511 Network Authentication Required (RFC 6585)

The client needs to authenticate to gain network access. Intended for use by intercepting proxies used to control access to the network (e.g., «captive portals» used to require agreement to Terms of Service before granting full Internet access via a Wi-Fi hotspot).^[29]

Unofficial codes

The following codes are not specified by any standard.

218 This is fine (Apache HTTP Server)

Used by Apache servers. A catch-all error condition allowing the passage of message bodies through the server when the ProxyErrorOverride setting is enabled. It is displayed in this situation instead of a 4xx or 5xx error message.^[34]

419 Page Expired (Laravel Framework)

Used by the Laravel Framework when a CSRF Token is missing or expired.^{[citation needed]}

420 Method Failure (Spring Framework)

A deprecated response used by the Spring Framework when a method has failed.^[35]

420 Enhance Your Calm (Twitter)

Returned by version 1 of the Twitter Search and Trends API when the client is being rate limited; versions 1.1 and later use the 429 Too Many Requests response code instead.^[36] The phrase «Enhance your calm» comes from the 1993 movie Demolition Man, and its association with this number is likely a reference to cannabis.^{[citation needed]}

430 Request Header Fields Too Large (Shopify)

Used by Shopify, instead of the 429 Too Many Requests response code, when too many URLs are requested within a certain time frame.^[37]

450 Blocked by Windows Parental Controls (Microsoft)

The Microsoft extension code indicated when Windows Parental Controls are turned on and are blocking access to the requested webpage.^[38]

498 Invalid Token (Esri)

Returned by ArcGIS for Server. Code 498 indicates an expired or otherwise invalid token.^[39]

499 Token Required (Esri)

Returned by ArcGIS for Server. Code 499 indicates that a token is required but was not submitted.^[39]

509 Bandwidth Limit Exceeded (Apache Web Server/cPanel)

The server has exceeded the bandwidth specified by the server administrator; this is often used by shared hosting providers to limit the bandwidth of customers.^[40]

529 Site is overloaded

Used by Qualys in the SSLLabs server testing API to signal that the site can’t process the request.^[41]

530 Site is frozen

Used by the Pantheon Systems web platform to indicate a site that has been frozen due to inactivity.^[42]

598 (Informal convention) Network read timeout error

Used by some HTTP proxies to signal a network read timeout behind the proxy to a client in front of the proxy.^[43]

599 Network Connect Timeout Error

An error used by some HTTP proxies to signal a network connect timeout behind the proxy to a client in front of the proxy.

Internet Information Services

Microsoft’s Internet Information Services (IIS) web server expands the 4xx error space to signal errors with the client’s request.

440 Login Time-out

The client’s session has expired and must log in again.^[44]

449 Retry With

The server cannot honour the request because the user has not provided the required information.^[45]

451 Redirect

Used in Exchange ActiveSync when either a more efficient server is available or the server cannot access the users’ mailbox.^[46] The client is expected to re-run the HTTP AutoDiscover operation to find a more appropriate server.^[47]

IIS sometimes uses additional decimal sub-codes for more specific information,^[48] however these sub-codes only appear in the response payload and in documentation, not in the place of an actual HTTP status code.

nginx

The nginx web server software expands the 4xx error space to signal issues with the client’s request.^[49][50]

444 No Response

Used internally^[51] to instruct the server to return no information to the client and close the connection immediately.

494 Request header too large

Client sent too large request or too long header line.

495 SSL Certificate Error

An expansion of the 400 Bad Request response code, used when the client has provided an invalid client certificate.

496 SSL Certificate Required

An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided.

497 HTTP Request Sent to HTTPS Port

An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests.

499 Client Closed Request

Used when the client has closed the request before the server could send a response.

Cloudflare

Cloudflare’s reverse proxy service expands the 5xx series of errors space to signal issues with the origin server.^[52]

520 Web Server Returned an Unknown Error

The origin server returned an empty, unknown, or unexpected response to Cloudflare.^[53]

521 Web Server Is Down

The origin server refused connections from Cloudflare. Security solutions at the origin may be blocking legitimate connections from certain Cloudflare IP addresses.

522 Connection Timed Out

Cloudflare timed out contacting the origin server.

523 Origin Is Unreachable

Cloudflare could not reach the origin server; for example, if the DNS records for the origin server are incorrect or missing.

524 A Timeout Occurred

Cloudflare was able to complete a TCP connection to the origin server, but did not receive a timely HTTP response.

525 SSL Handshake Failed

Cloudflare could not negotiate a SSL/TLS handshake with the origin server.

526 Invalid SSL Certificate

Cloudflare could not validate the SSL certificate on the origin web server. Also used by Cloud Foundry’s gorouter.

527 Railgun Error

Error 527 indicates an interrupted connection between Cloudflare and the origin server’s Railgun server.^[54]

530

Error 530 is returned along with a 1xxx error.^[55]

AWS Elastic Load Balancing

Amazon Web Services’ Elastic Load Balancing adds a few custom return codes to signal issues either with the client request or with the origin server.^[56]

460

Client closed the connection with the load balancer before the idle timeout period elapsed. Typically when client timeout is sooner than the Elastic Load Balancer’s timeout.^[56]

463

The load balancer received an X-Forwarded-For request header with more than 30 IP addresses.^[56]

464

Incompatible protocol versions between Client and Origin server.^[56]

561 Unauthorized

An error around authentication returned by a server registered with a load balancer. You configured a listener rule to authenticate users, but the identity provider (IdP) returned an error code when authenticating the user.^[56]

Caching warning codes (obsoleted)

The following caching related warning codes were specified under RFC 7234. Unlike the other status codes above, these were not sent as the response status in the HTTP protocol, but as part of the «Warning» HTTP header.^[57][58]

Since this «Warning» header is often neither sent by servers nor acknowledged by clients, this header and its codes were obsoleted by the HTTP Working Group in 2022 with RFC 9111.^[59]

110 Response is Stale

The response provided by a cache is stale (the content’s age exceeds a maximum age set by a Cache-Control header or heuristically chosen lifetime).

111 Revalidation Failed

The cache was unable to validate the response, due to an inability to reach the origin server.

112 Disconnected Operation

The cache is intentionally disconnected from the rest of the network.

113 Heuristic Expiration

The cache heuristically chose a freshness lifetime greater than 24 hours and the response’s age is greater than 24 hours.

199 Miscellaneous Warning

Arbitrary, non-specific warning. The warning text may be logged or presented to the user.

214 Transformation Applied

Added by a proxy if it applies any transformation to the representation, such as changing the content encoding, media type or the like.

299 Miscellaneous Persistent Warning

Same as 199, but indicating a persistent warning.

See also

• Custom error pages
• List of FTP server return codes
• List of HTTP header fields
• List of SMTP server return codes
• Common Log Format

Explanatory notes

References

External links

• «RFC 9110: HTTP Semantics and Content, Section 15 «Status Codes»«.
• Hypertext Transfer Protocol (HTTP) Status Code Registry at the Internet Assigned Numbers Authority
• HTTP status codes at http-statuscode.com
• MDN status code reference at mozilla.org

The HTTP 303 Status Code occurs when a page has been temporarily moved. As a result, the server can’t connect to the requested resource. Instead, you’ll be redirected to a new page. Not only is this frustrating, but it can also lead to other problems such as infinite loops and caching issues.

Fortunately, it’s easier to fix the 303 See Other code when you know what’s causing the message. For instance, you might need to check your server configuration or enable debugging in WordPress to view your error log.

In this post, we’ll take a closer look at the HTTP 303 Status Code. Then, we’ll discuss some common causes before we show you how to fix them. Let’s get started!

Check Out Our Video Guide To Fixing the HTTP 303 Status Code:

What Is the HTTP 303 Status Code?

When you’re presented with the HTTP 303 Status Code, it means that the redirects don’t connect to the recently transferred resource. Instead, they connect to another page like a transfer page.

The message is a way for servers to tell browsers that a page has been temporarily moved. So, while the server successfully received the data for the HTTP request, you’ll need to send a new GET request to the new URL.

The 303 See Other Code reaction (as it’s also known) is usually the result of PUT or POST requests. Sometimes, it can also be caused by DELETE. Since the browser handles the code by displaying a new location, you will be redirected in WordPress without needing to take action

However, there are some problems associated with the status code:

• It can lead to infinite loops. This can happen if each page redirects the user back to the original resource.
• It makes it difficult for caching proxies to cache resources. Typically, proxies only cache resources that are returned with a 200 status code.
• It can lead to increased bandwidth usage and poor performance. This can occur when these 303 resources aren’t cached.

It’s also important to be aware that the 303 Status Code works differently from any other HTTP status codes. For instance, the HTTP 301 Status Code also presents a redirection message, but you’ll only see this message when the page has been moved permanently.

Additionally, HTTP 302 Status Code is the sibling of the 303 Status Code. However, this is only utilized for impermanent diversions.

Meanwhile, the HTTP 304 Status Code (otherwise known as Not Modified) means that the resource hasn’t been changed. Therefore, when you see this message, it’s best to hold on to the duplicate.

Tired of infinite loops & caching issues? Learn how to fix the 303 See Other code with this guide 🛠️Click to Tweet

What Causes an HTTP 303 Status Code?

The HTTP 303 Status Code simply indicates the result of a client’s request. It’s a greatly misunderstood status code because most users assume that it represents an error. In fact, all it means is that the server is redirecting you to a new location.

Here are some of the reasons why you might see the HTTP 303 Status Code:

• There’s been a change in the location of a resource. For instance, it may have been moved to a different URL.
• There’s been a change in the way the resource is accessed. For example, it might not be readily accessible or publicly available anymore.
• The server has been misconfigured. This is a common occurrence.
• There is a problem within your application. This typically occurs when your client application contains some custom code that’s triggering the message.

Typically, it’s easy to fix the HTTP 303 Status Code when you know what’s causing the issue.

How To Fix an HTTP 303 Status Code

Now that you know a bit more about the HTTP 303 Status Code, let’s take a look at some simple ways to fix it.

However, before we get started, it’s important to make a backup of your website. That’s because some of these troubleshooting steps require you to edit your site files, which can be a delicate task.

You might also prefer to run these fixes in a staging environment first. Then, once you’re sure everything is working, you can push the changes to your live website.

1. Check Your Server Configuration

To find out what’s causing the 303 redirects, you can check the configuration files for your server software, looking for unintentional redirect instructions. However, first, you’ll need to determine which web server software you’re using.

Nginx and Apache tend to be the most popular options, so your server is most likely using one of these. In this section, we’ll show you how to check your configuration files for Apache.

To get started, you’ll need to access your site files. If your web host uses cPanel, you can access its File Manager to do this.

Alternatively, you can connect to your site files using SFTP. For this approach, you’ll need to download an FTP client such as FileZilla. You’ll also need your FTP credentials.

With MyKinsta locating your FTP credentials is simple. Just navigate to your dashboard and click on your website. Then, in the Info tab, scroll down to the SFTP/SSH section:

Once you’ve established a connection with your FTP client, locate your root directory, which is usually labeled public_html. Then, look for your .htaccess file:

Next, open this file in a text editor and look for lines that use RewriteXXX directives. A RewriteCond directive defines a text-based pattern that gets matched against entered URLs.

If a matching URL is requested by a visitor, the RewriteRule directive that follows RewriteCond directives performs the redirection to the new URL. At the end of the RewriteRule look out for [R=303].

If you find this value entered after the RewriteRule, you can try temporarily commenting them out. To do this, use the # character prefix. Then, restart the web server and see if the 303 Status Code has cleared.

2. View Your Server Logs

Most applications keep some kind of server log where you can keep track of all activity. For instance, these server application logs can reveal which pages have been requested and which database results have been provided.

Meanwhile, web server logs concern the hardware that runs your website, providing information about the health and status of connected services (and the server itself). So, you can try to resolve the 303 status code by finding your server log and analyzing its contents.

If your website is hosted with Kinsta, you’ll get access to three types of log files in MyKinsta:

• error.log (specific errors, including PHP errors, are logged here)
• kinsta-cache-perf.log (cache error status for requests are stored here like hit, miss, bypass)
• access.log (here, you’ll find all Nginx requests for the current day)

To view these logs, you’ll need to log into your MyKinsta dashboard. Then, click on WordPress Sites in the menu on the left-hand side of your screen. Now, choose the website that you want to view the logs for and click on the Logs tab:

The first log file you’re able to view is the error.log. But you can use the dropdown menu to select any of the logs that you want to check out:

Once you’ve chosen the log you’d like to view, you’ll see a list of all the errors or requests that have taken place on your site:

You can also use the search bar to search for specific text in the file. Plus, you can use SFTP to download the log to your computer.

While accessing your server logs isn’t a solution in itself, analyzing them can help you figure out the issue that’s triggering the 303 Status Code.

3. Debug Your Application

Lastly, you may want to try debugging your client application. This option is best if there is some custom code in your application that’s causing the HTTP 303 Status Code.

To begin, make a copy of your site in a local environment. This way, you can recreate the exact scenario in which the 303 status code occurred. You’ll also be able to view the application code the moment something goes wrong.

To enable debugging in WordPress, it’s easiest to use a plugin like WP Debugging:

Alternatively, you can do this manually by editing your wp-config.php file. Again, you’ll need to access your site files via cPanel or using an FTP client. Then, find the file in your website’s root folder.

Once you’re in the wp-config.php file, head to the bottom of the file where it says “That’s all, stop editing!” Then, add the following code:

define( 'WP_DEBUG', true );

define( 'WP_DEBUG_LOG', true );

Now, you can view your site’s errors by locating your wp-content folder. If the debug was successful, you’ll be able to spot a debug.log file that’s only visible once WordPress has entered debug mode.

You can download the file to view it on your computer and find the error that’s causing the HTTP 303 Status Code. After that, you can disable debug mode by changing the values to “false” or deleting the lines of code completely.

Does an HTTP 303 Status Code Affect SEO?

If you’re concerned about your website’s visibility, then you might be wondering how the 303 HTTP Status code affects Search Engine Optimization (SEO).

The good news is that the 303 See Other code is unlikely to have any significant impact on your site’s SEO. The main purpose of the message is to tell the client that the requested resource has been moved.

Therefore, the client needs to make a new request to the new location in order to access the resource. The 303 Status Code is designed to be used for GET requests only. So, clients should use the new URL when they make future requests to the resource.

While the 303 Status Code is unlikely to affect SEO, the related HTTP 301 and HTTP 302 Status Codes can. That’s because these are used for permanent and temporary redirects. Therefore, they can transfer your site’s link equity.

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Summary

The HTTP 303 Status Code is an extremely frustrating error. What’s more, it’s widely misunderstood, so it can be challenging to resolve. Fortunately, there are ways to fix the 303 See Other message and enable the server to connect to the requested resource.

For example, you might need to check your server configuration files and look for unintentional redirects. Additionally, you can view your server logs or debug your application to find the error that’s causing the HTTP 303 Status Code.

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HTTP response status code 303 See Other is returned by the server to indicate that the supplied Location does not link directly to the recently uploaded resource. Rather, it links to an alternative page such as an upload confirmation message. The HTTP method used for the second HTTP request is always a HTTP GET method.

Usage

The 303 See Other status code is typically returned as the result of a POST, PUT, or DELETE HTTP request. Essentially, it means that the result of the HTTP request can be found at a different URL. To fetch the new resource, the client must use a GET HTTP request with the specified Location.

Example

In the example, the client requests that a specific resource be deleted from the server. In response, the server sends the 303 See Other status code because it does not contain a viewable resource at the original Location. Rather, it points to a confirmation message at the newly specified Location.

Request

DELETE /tasks/314 HTTP/1.1
Host: www.example.re

Response

HTTP/1.1 303 See Other
Location: http//www.example.re/confirmation/delete.html

Code references

.NET

HttpStatusCode.SeeOther

Rust

http::StatusCode::SEE_OTHER

Rails

:see_other

Go

http.StatusSeeOther

Symfony

Response::HTTP_SEE_OTHER

Python3.5+

http.HTTPStatus.SEE_OTHER

Java

java.net.HttpURLConnection.HTTP_SEE_OTHER

Apache HttpComponents Core

org.apache.hc.core5.http.HttpStatus.SC_SEE_OTHER

Angular

@angular/common/http/HttpStatusCode.SeeOther

Takeaway

The 303 See Other status code indicates that the result of the HTTP request is viewable at an alternate Location, which is expected to be accessed using a HTTP GET method.

See also

• 302 Found
• RFC 7231

If you’ve ever used the internet, you’ve probably encountered a 303 status code. You may not have known what it was called, or what it meant, but you’ve seen it. The HTTP 303 status code is essentially a way for servers to tell browsers that a page has been moved temporarily. In this blog post, we’ll take a closer look at the 303 status code, and some of its potential uses. We’ll also discuss some of the most common problems people encounter with this code.

What is http 303 code

The HTTP 303 is a status code that indicate that the web server is redirecting the user to another resource because the original target resource/requested resource has been placed to different place. The new resource is typically provided as a response to the user’s request. When a user agent receives an HTTP 303 status code, it firstly requests the new resource from the location indicated by the Location header before returning any content to the user. This allows for a greater degree of control over how users are redirected to new resources. In addition, it allows for content to be provided to the user without them having to make a new request. The HTTP 303 is an important status code that can help to improve the usability of a website.

How does the browser handle 303 http status code

The browser handles this status code by automatically fetching the new location and displaying it to the user. This allows for a seamless experience for the user, as they are effectively redirected to the new page without having to take any action. In most cases, the browser will also cache the new location so that future requests can be handled more quickly. However, if the 303 status code is accompanied by a “Cache-Control: no-cache” header, then the browser will not cache the new location and will instead fetch it afresh each time. This is typically done to ensure that the latest version of the page is always displayed to the user.

Common problems with 303 http status code

The 303 status response code is one of the many HTTP status codes used by web servers to indicate the result of a client’s request. It is also one of the most misunderstood status codes, as many people incorrectly assume that it represents an error. In reality, the 303 status code simply means that the server is redirecting the client to another resource. This redirection can be caused by a number of factors, such as a change in the location of a resource or a change in the way that the resource is accessed. Regardless of the cause, it is important to be aware of the potential problems that can arise from using the 303 status code.

One of the most common problems with 303 status codes is that they can lead to infinite loops. For example, if a server redirects a client to a different resource, but that resource also redirects the client back to the original resource, then the client will be stuck in an infinite loop. This can obviously cause major problems for both the client and the server. Another problem with 303 status codes is that they can make it difficult for caching proxies to cache resources. This is because caching proxies typically only cache resources that are returned with a 200 status code. As a result, they will often not cache resources that are redirected with a 303 status code, which can lead to increased bandwidth usage and decreased performance.

How to fix 303 http status code

It should be noted that some older browsers do not support the 303 status code and will instead treat it as a 302 status code. As a result, it is important to check your server’s compatibility before implementing this code.

Ways to fix any 303 http status code issues:

1. Redirect the URL

One way to fix a 303 status code is to redirect the URL to a different page. This can be done using an .htaccess file or by editing the server’s configuration file.

2. Set the correct headers

Another way to fix a 303 status code is to set the correct headers. This can be done by setting the Location header to the correct URL.

3. Use a different http method

If you are using a POST method, you can try using a different request method such as GET method or HEAD.

4. Check for errors

It is also important to check for any errors that may have caused the 303 status code to be returned. This can be done by checking the server’s error logs.

5. Contact the website owner

If you are still having trouble, you can try contacting the website owner or administrator for help.

303 http status code example

1. The 303 status code indicates that a resource has been moved to another location, typically in response to a POST request or GET request.

2. The 303 status code can be used in conjunction with the Location header to redirect the user to the new location.

3. The 303 status code is often used in place of the 302 status code, as it is more specific and therefore less likely to be misinterpreted by the user agent.

4. The 303 status code should only be used when the new location is known and can be specified in the Location header.

5. The 303 status code should not be used if the new location is not known or cannot be specified in the Location header.

Similar http status codes

There are a number of different http status codes that indicate a similar or related condition. The 303 http status code indicates that a resource has been moved and is now available at a different location. This is similar to the 302 http status code, which indicates that a resource has been temporarily moved and is available at a different location. The 307 http status code indicates that a resource has been moved permanently and is now available at a different location. These status codes are all part of the 3xx class of status codes, which indicate redirection. When a client receives one of these status codes, it should automatically redirected to the new location indicated by the origin server.

All HTTP status codes by categories