What are HTTP status codes?
An HTTP status code is a server response to a browser’s request. This means that, whenever you visit a website, your browser sends a request to the site’s server, and the server then responds to the browser’s request with a three-digit code: HTTP status code.
These status codes indicate whether a specific HTTP request has been successfully completed. They communicate whether requests are okay, touch-and-go, or whether something is wrong.
Understanding status codes and how to use them will help you to diagnose site errors quickly to minimize downtime on your site. You can even use some of these status codes to help search engines and people access your site; a 301 redirect, for example, will tell bots and people that a page that has moved somewhere else permanently.
Responses are grouped in five classes. The first digit of each three-digit status code begins with one of five numbers, 1 through 5; you may see this expressed as 1xx or 5xx to indicate status codes in that range. Each of those ranges encompasses a different class of server response.
As a developer, understanding these status codes would speed up debugging process and help resolve issues quickly.
Some of the HTTP status are listed below.
HTTP status code classes:
1xx: Information responses
|100: Continue||Only a part of the request has been received by the server, but as long as it has not been rejected, the client should continue with the request.|
|101: Switching Protocols||The server switches protocol.|
|200: OK||The request is OK.|
|201: Created||The request is complete, and a new resource is created .|
|202: Accepted||The request is accepted for processing, but the processing is not complete.|
|203: Non-authoritative Information||The information in the entity header is from a local or third-party copy, not from the original server.|
|204: No Content||A status code and a header are given in the response, but there is no entity-body in the reply.|
|205: Reset Content||The browser should clear the form used for this transaction for additional input.|
|206: Partial Content||The server is returning partial data of the size requested. Used in response to a request specifying a Range header. The server must specify the range included in the response with the Content-Range header.|
|300 Multiple Choices||A link list. The user can select a link and go to that location. Maximum five addresses .|
|301 Moved Permanently||The requested page has moved to a new url .|
|302 Found||The requested page has moved temporarily to a new url .|
|303 See Other||The requested page can be found under a different url .|
|304 Not Modified||This is the response code to an If-Modified-Since or If-None-Match header, where the URL has not been modified since the specified date.|
|305 Use Proxy||The requested URL must be accessed through the proxy mentioned in the Location header.|
|306 Unused||This code was used in a previous version. It is no longer used, but the code is reserved.|
|307 Temporary Redirect||The requested page has moved temporarily to a new url.|
4xx: Client Errors
|400: Bad Request||The server did not understand the request.|
|401: Unauthorized||The requested page needs authentication i.e. a username and a password.|
|402: Payment Required||You can not use this code yet.|
|403: Forbidden||Access is forbidden to the requested page.|
|404: Not Found||The server can not find the requested page.|
|405: Method Not Allowed||The method specified in the request is not allowed.|
|406: Not Acceptable||The server can only generate a response that is not accepted by the client.|
|407: Proxy Authentication Required||You must authenticate with a proxy server before this request can be served.|
|408: Request Timeout||The request took longer than the server was prepared to wait.|
|409: Conflict||The request could not be completed because of a conflict.|
|410: Gone||The requested page is no longer available .|
|411: Length Required||The "Content-Length" is not defined. The server will not accept the request without it .|
|412: Precondition Failed||The pre condition given in the request evaluated to false by the server.|
|413: Request Entity Too Large||The server will not accept the request, because the request entity is too large.|
|414: Request-url Too Long||The server will not accept the request, because the url is too long. Occurs when you convert a "post" request to a "get" request with a long query information .|
|415: Unsupported Media Type||The server will not accept the request, because the mediatype is not supported .|
|416: Requested Range Not Satisfiable||The requested byte range is not available and is out of bounds.|
|417: Expectation Failed||The expectation given in an Expect request-header field could not be met by this server.|
5xx: Server Error
|500 Internal Server Error||The request was not completed. The server met an unexpected condition.|
|501 Not Implemented||The request was not completed. The server did not support the functionality required.|
|502 Bad Gateway||The request was not completed. The server received an invalid response from the upstream server.|
|503 Service Unavailable||The request was not completed. The server is temporarily overloading or down.|
|504 Gateway Timeout||The gateway has timed out.|
|505 HTTP Version Not Supported||The server does not support the "http protocol" version.|
I hope you find this article useful, don't forget to also drop your comment on how you feel about this topic.
Enjoy this article ? drop a comment below and add your own contribution.