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HTTP STATUS CODES GLOSSARY

> This list is an easy-to-reference database of HTTP status codes with their
> definitions and helpful code references all in one place. Visit an individual
> status code via
> https://www.webfx.com/web-development/glossary/http-status-codes/what-is-a-___-status-code/
> or browse the list below.


1XX INFORMATIONAL

 * 100 Continue
 * 101 Switching Protocols
 * 102 Processing


2×× SUCCESS

 * 200 OK
 * 201 Created
 * 202 Accepted
 * 203 Non-authoritative Information
 * 204 No Content
 * 205 Reset Content
 * 206 Partial Content
 * 207 Multi-Status
 * 208 Already Reported
 * 226 IM Used


3×× REDIRECTION

 * 300 Multiple Choices
 * 301 Moved Permanently
 * 302 Found
 * 303 See Other
 * 304 Not Modified
 * 305 Use Proxy
 * 307 Temporary Redirect
 * 308 Permanent Redirect


4×× CLIENT ERROR

 * 400 Bad Request
 * 401 Unauthorized
 * 402 Payment Required
 * 403 Forbidden
 * 404 Not Found
 * 405 Method Not Allowed
 * 406 Not Acceptable
 * 407 Proxy Authentication Required
 * 408 Request Timeout
 * 409 Conflict
 * 410 Gone
 * 411 Length Required
 * 412 Precondition Failed
 * 413 Payload Too Large
 * 414 Request-URI Too Long
 * 415 Unsupported Media Type
 * 416 Requested Range Not Satisfiable
 * 417 Expectation Failed
 * 418 I’m a teapot
 * 421 Misdirected Request
 * 422 Unprocessable Entity
 * 423 Locked
 * 424 Failed Dependency
 * 426 Upgrade Required
 * 428 Precondition Required
 * 429 Too Many Requests
 * 431 Request Header Fields Too Large
 * 444 Connection Closed Without Response
 * 451 Unavailable For Legal Reasons
 * 499 Client Closed Request


5×× SERVER ERROR

 * 500 Internal Server Error
 * 501 Not Implemented
 * 502 Bad Gateway
 * 503 Service Unavailable
 * 504 Gateway Timeout
 * 505 HTTP Version Not Supported
 * 506 Variant Also Negotiates
 * 507 Insufficient Storage
 * 508 Loop Detected
 * 510 Not Extended
 * 511 Network Authentication Required
 * 599 Network Connect Timeout Error


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FAQS ABOUT HTTP STATUS CODES

Learn more about HTTP status codes with these FAQs:

WHAT ARE HTTP STATUS CODES?

HTTP status codes are three-digit numbers that are returned by servers to
indicate the status of a client’s request. When a client (such as a web browser)
makes a request to a server, the server will respond with a status code and a
message indicating whether the request was successful or not.

WHAT ARE THE HTTP STATUS CODE CLASSES?

There are five classes of HTTP status codes, each identified by the first digit
of the three-digit status code. The classes are as follows:

1XX (INFORMATIONAL)

These status codes indicate that the server has received the request and is
continuing to process it. They are primarily used to convey information about
the status of the request while it is being processed.

2XX (SUCCESSFUL)

These status codes indicate that the request was successfully received,
understood, and accepted by the server. They are typically used to indicate that
the requested action has been successfully completed.

3XX (REDIRECTION)

These status codes indicate that the client needs to take additional action to
complete the request. They are typically used to redirect the client to a
different resource or location.

4XX (CLIENT ERROR)

These status codes indicate that the server cannot process the request because
the client has made an error. They are typically caused by issues such as
invalid input, authentication problems, or insufficient permissions.

5XX (SERVER ERROR)

These status codes indicate that the server encountered an error while
processing the request. They are typically caused by issues such as server
overload, programming errors, or infrastructure problems.

WHICH HTTP STATUS CODES AFFECT SEO?

Several HTTP status codes are important for SEO, including:

200 OK

This is the most common status code and indicates that the server has
successfully processed the request and returned the requested resource. This is
the ideal status code to receive for search engine optimization purposes as it
indicates that the content is available and accessible to both users and search
engines.

301 MOVED PERMANENTLY

This status code indicates that the requested resource has been permanently
moved to a new URL. This is important for SEO because it ensures that search
engines can redirect users to the new URL and transfer the SEO value of the old
URL to the new one.

404 NOT FOUND

This status code indicates that the requested resource is not available on the
server. This can be problematic for SEO because it indicates to both users and
search engines that the content is not available. It is important to fix 404
errors as soon as possible to avoid losing SEO value and providing a poor user
experience.

503 SERVICE UNAVAILABLE

This status code indicates that the server is temporarily unavailable due to
maintenance or overload. This can be problematic for SEO because search engines
may interpret this as a sign of an unreliable website. It is important to fix
503 errors as soon as possible to avoid losing SEO value and providing a poor
user experience.

In general, it is important to monitor and fix any HTTP status codes that could
negatively impact user experience or search engine indexing.

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