How To Internet & Network A Complete List of HTTP Status Lines Share Pin Email Print Hannesfr / Wikimedia Commons / CC BY 3.0 Internet & Network Key Concepts The Wireless Connection Basics Guides & Tutorials Installing & Upgrading Tips & Tricks What Are Bitcoins? by Tim Fisher Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. Updated May 09, 2019 The HTTP status line is the term given to the HTTP status code (the actual code number) when accompanied by the HTTP reason phrase1 (the short description). We also keep a list of HTTP status code errors (4xx and 5xx) along with some tips on how to fix them. Though technically incorrect, HTTP status lines are often referred to as simply HTTP status codes. HTTP Status Code Categories As you can see below, HTTP status codes are three-digit integers. The very first digit is used to identify the code within a specific category - one of these five: 1XX: Informational - the request was accepted or the process is continuing.2XX: Confirms that the action completed successfully or was understood.3XX: Redirection - something else needs to take place in order to complete the request.4XX: Client error that indicates that the request can't complete or contains the wrong syntax.5XX: Server error that indicates that the server failed to complete a request that was supposedly valid. Applications that understand HTTP status codes don't have to know all of the codes, which means an unknown code also has an unknown HTTP reason phrase, which won't give the user much information. However, these HTTP applications do have to understand the categories or classes as we've described them above. If the software doesn't know what the specific code means, it can at the very least identify the class. For example, if a 490 status code is unknown to the application, it can treat it as a 400 because it's in the same category, and can then assume that there's something wrong with the client request. HTTP Status Lines (HTTP Status Codes + HTTP Reason Phrases) Official HTTP Status Lines Status Code Reason Phrase 100 Continue 101 Switching Protocols 102 Processing 200 OK 201 Created 202 Accepted 203 Non-Authoritative Information 204 No Content 205 Reset Content 206 Partial Content 207 Multi-Status 300 Multiple Choices 301 Moved Permanently 302 Found 303 See Other 304 Not Modified 305 Use Proxy 307 Temporary Redirect 308 Permanent Redirect 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 Time-out 409 Conflict 410 Gone 411 Length Required 412 Precondition Failed 413 Request Entity Too Large 414 Request-URI Too Large 415 Unsupported Media Type 416 Request Range Not Satisfiable 417 Expectation Failed 421 Misdirected Request 422 Unprocessable Entity 423 Locked 424 Failed Dependency 425 Unordered Collection 426 Upgrade Required 428 Precondition Required 429 Too Many Requests 431 Request Header Fields Too Large 451 Unavailable For Legal Reasons 500 Internal Server Error 501 Not Implemented 502 Bad Gateway 503 Service Unavailable 504 Gateway Time-out 505 HTTP Version Not Supported 506 Variant Also Negotiates 507 Insufficient Storage 508 Loop Detected 510 Not Extended 511 Network Authentication Required  The HTTP reason phrases that accompany HTTP status codes are only recommended. A different reason phrase is allowed per RFC 2616 6.1.1. You might see HTTP reason phrases replaced with a more "friendly" description or in a local language. Unofficial HTTP Status Lines The HTTP status lines below might be used by some third-party services as error responses, but they are not specified by any RFC. Other Possible HTTP Status Lines Status Code Reason Phrase 103 Checkpoint 420 Method Failure 420 Enhance Your Calm 440 Login Timeout 449 Retry With 450 Blocked by Windows Parental Controls 451 Redirect 498 Invalid Token 499 Token Required 499 Request has been forbidden by antivirus 509 Bandwidth Limit Exceeded 530 Site is frozen It's important to remember that while HTTP status codes may share the same numbers with errors messages found in other contexts, like with Device Manager error codes, it doesn't mean they're related in any way. Continue Reading What Is an HTTP Status Code? The 21 Best 404 Error Pages Ever See an Error Code in Your Browser? 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