HTTP status codes are three-digit responses from the server to the browser-side request. Everyone has probably gotten the classic 404 page-not-found error. That is an HTTP client error status code and there are a lot more of them.
These status codes (also called response status codes) serve as a means of communication between the server and the internet browser and there are multiple code classes based on the type of information they are communicating. The differences in classes are indicated through the first digit of the error code, for example: just like a 404, any other 4xx will mean that in some way the page or website could not be reached, while a 2xx means that your request was successfully completed.
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In some cases a HTTP response code might be descriptive enough to understand its meaning. 200 OK probably means that everything went okay. But what about a 103 Early Hints, 205 Reset Content and 305 Use Proxy?
A 1xx Informational status code means that the server has received the request and is continuing the process. A 1xx status code is purely temporary and is given while the request processing continues. For most tasks you won't encounter these much, as it's not the final response to the request.
The 100 Continue status code means that the initial part of the request has been received by the server and that the client should proceed with the request or ignore the response if the request has already finished.
The 103 Early hints status code is intended to be used to allow the user agent to preload resources, while the server prepares a response. It is intended to be primarily used with the Link Header.
A 2xx Succesful status code means that the request was successful and the browser has received the expected information. This is generally the one you want to see, as it means that the request was a success and has been received, understood and accepted it. As a website owner you should make sure that all pages and resources (images, videos, etc.) all return a 2xx status code. This means that browsers can reach it successfully and that your website visitors can see and use your website.
When looking at things SEO-wise the 200 OK response code is the perfect status code for a functioning page, all the linked pages are working as they should. A 200 will mean that search engine crawlers can successfully crawl the page and it will be put into their search index.
The 202 Accepted status code means that the request has been accepted for processing, but the processing has not been finished yet. The request may or may not be completed when the processing eventually takes place.
The 203 Non-Authoritative Information status code means that the request was successful. However, the meta-information that has been received is different from the one on the origin server and has instead been collected from a 3rd party or local copy. When not used for backups or mirrors of another resource a 200 OK response is preferable.
The 204 No Content status code means that while the server has successfully fulfilled the request, there is no available content for this request. But the user agent might want to update its currently cached headers for this resource, for the new one.
The 208 Already Reported status code is used inside the response element DAV: propstat, in order to avoid enumerating the internal members of multiple bindings to the same collection repeatedly.
The 226 IM response code means that the server has successfully fulfilled a GET request for the resource, and the response is a representation of the result of one or multiple instance-manipulations applied to the current instance.
A 3xx Redirection status code means that you have been redirected and the completion of the request requires further action. Redirects are a natural part of the internet and you shouldn't be scared to have 3xx redirect status codes on your website. A redirect means that the request was received successfully, but that the resource was found elsewhere. If a webpage has changed path and you try to access it through the old path, your CMS will often redirect the user to the new path. Ultimately the request will end in a 2xx success, but first it must go through the 3xx redirection.
The 301 Moved Permanently response code means that the target resource has been assigned a new permanent URL and any references to this resources in the future should use one of the URLs included in the response.
When looking at things SEO-wise the 301 Permanent Redirect should be used every time a URL is moved permanently. This redirect passes your current link equity from your content to the new URL. Links that result in a status code 301 does give slightly less link equity than 200. So if you have a lot of links going through a 301 Permanent Redirect it is advised to fix these, if possible.
When looking at things SEO-wise the 302 Found should only be used when making temporary changes as it does not pass the link equity the same way as a 301. If the page is not going to come back you should always use 301.
The 304 Not Modified response code informs the client that the response has not been modified. This means that the client can continue to use the already present, cached version of the response.
The 307 Temporary Redirect status code gets sent by the server in order to direct the client to the requested resource at another URI. The request method, however, must not be changed.
The 308 Permanent Redirect status code means that the requested resource has been permanently assigned a new URI and future references to the resource should be made by using one of the enclosed URIs.
A 4xx Client Error status code means that the website or the page could not be reached and either the page is unavailable or the request contains bad syntax. As a website owner you should do your best to avoid these, as it means your users will not find what they're looking for. This can be either pages that are no longer found and are either temporarily or permanently gone. Besides giving a bad user experience, it can also hurt your SEO efforts.
The 402 Payment Required status code is a response reserved for future use. It was originally created to be implemented in digital payment systems, however, it is rarely used and a standard convention of using it does not exist.
The 403 Forbidden status code means that the client request has been rejected because the client does not have rights to access the content. Unlike a 401 error, the client's identity is known to the server, but since they are not authorized to view the content, giving the proper response is rejected by the server.
The 404 Not Found status code means that the server either did not find a current representation for the requested resource or is trying to hide its existence from an unauthorized client.
When looking at things SEO-wise the 404 Not Found status code pages with a high volume of traffic should be redirected using a 301 to the most relevant page possible. For some pages, however, a 404 might be necessary, for example, if the product is out of stock for an extended period of time. If you have external links pointing to a page that returns 404, you will lose the link equity those links would otherwise give.
The 409 Conflict status code means that the request could not be fulfilled due to a conflict with the current state of the target resource and is used in situations where the user might be able to resubmit the request after resolving the conflict.
When looking at things SEO-wise the 410 Gone status code is a more permanent version a 404. The page will no longer be available from the server and has no forwarding address available. If you want to completely remove a page from Googles search index, then using 410 on a page is the proper way of doing it (instead of simply 404).
The 413 Payload Too Large status code means the server refuses to process the request because the request payload is larger than the server is able or willing to process. While the server may close the connection to prevent the client from continuing the request, it should generate a Retry-After header field and after how long can the client retry.
The 416 Range Not Satisfiable status code means that the range specified in the Range header field of the request can't be fulfilled. The reason might be that the given range is outside the size of the target URI's data.
The 418 I'm a Teapot status code means that the server refuses to brew coffee because it is, in fact, a teapot. (It is a reference to a 1998 April Fools' joke called ''Hyper Text Coffee Pot Control Protocol'').
The 426 Upgrade Required status code means that while the server refuses to perform the given request using the current protocol, it might be willing to do so after the client has been upgraded to a different protocol.
The 431 Request Header Fields Too Large means that the server is not willing to process the request because its header fields are indeed too large, however, the request may be submitted again once the size of the request header fields is reduced.
A 5xx Server error status code means that while the request appears to be valid, the server could not complete the request. If you're experiencing 5xx server errors for your website, you should immediately look at your server. If you're hosting your own server you'll need to start debugging to figure out why it is not responding properly. If you're using an external hosting provider you'll need to reach out to them, so they can look at it.
When looking at things SEO-wise the 500 Internal Server Error indicates a problem with the server, not the actual availability of the content. Since bots and users will both be lost, the link equity will go down fast. 152ee80cbc
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