| [1139] | 1 | ValExtLinks prints the HTTP response code for each link (except EI and IW links) in parentheses after the OK/NG/RD status of the link. Based on [[wp:List_of_HTTP_status_codes|this Wikipedia list]], following are the codes understood by ValExtLinks. When no HTTP response could be retrieved by the Unix tool 'curl' which queries each link, you'll see "(000-xx)", where the one- or two-digit number after the dash is the [[../Curl codes|'curl' error code]].
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| 2 | __NOTOC__
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| 3 | ==2xx: Success==
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| 4 | This class of status codes indicates the action requested by the client was received, understood, accepted, and processed successfully.
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| 5 |
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| 6 | ;200 OK
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| 7 | :Standard response for successful HTTP requests.
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| 8 |
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| 9 | ==3xx: Redirection==
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| 10 | 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.
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| 11 |
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| 12 | ;301 Moved Permanently
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| 13 | :This and all future requests should be directed to the given URI.
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| 14 |
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| 15 | ;302 Found
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| 16 | :This is an example of industry practice contradicting the standard. The HTTP/1.0 specification required the client to perform a temporary redirect (the original describing phrase was "Moved Temporarily"), but popular browsers implemented 302 with the functionality of a 303 See Other. Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviors. However, some Web applications and frameworks use the 302 status code as if it were the 303.
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| 17 |
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| 18 | ;303 See Other
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| 19 | :The response to the request can be found under another URI using a GET method.
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| 20 |
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| 21 | ;307 Temporary Redirect
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| 22 | :The request should be repeated with another URI; however, future requests should still use the original URI.
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| 23 |
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| 24 | ;308 Permanent Redirect
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| 25 | :The request and all future requests should be repeated using another URI.
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| 26 |
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| 27 | ==4xx: Client Errors==
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| 28 | This class of status codes is intended for situations in which the client seems to have erred.
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| 29 |
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| 30 | ;400 Bad Request
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| 31 | :The server cannot or will not process the request due to an apparent client error (e.g., malformed request syntax).
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| 32 |
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| 33 | ;401 Unauthorized
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| 34 | :Similar to 403 Forbidden, but specifically for use when authentication is required and has failed or has not yet been provided.
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| 35 |
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| 36 | ;403 Forbidden
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| 37 | :The request was valid, but the server is refusing action. The user might not have the necessary permissions for a resource.
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| 38 |
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| 39 | ;404 Not Found
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| 40 | :The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible.
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| 41 |
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| 42 | ;405 Method Not Allowed
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| 43 | :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.
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| 44 |
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| 45 | ;406 Not Acceptable
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| 46 | :The requested resource is capable of generating only content not acceptable according to the Accept headers sent in the request.
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| 47 |
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| 48 | ;410 Gone
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| 49 | :Indicates that the resource requested 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.
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| 50 |
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| 51 | ;418 I'm a teapot
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| 52 | :This is a joke response code used by some sites. Probably equivalent to a 200.
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| 53 |
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| 54 | ==5xx: Server Errors==
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| 55 | These codes mean that the server failed to fulfill an apparently valid request.
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| 56 |
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| 57 | ;500 Internal Server Error
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| 58 | :A generic error message, given when an unexpected condition was encountered and no more specific message is suitable.
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| 59 |
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| 60 | ;501 Not Implemented
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| 61 | :The server either does not recognize the request method, or it lacks the ability to fulfill the request. Usually this implies future availability (e.g., a new feature of a web-service API).
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| 62 |
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| 63 | ;502 Bad Gateway
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| 64 | :The server was acting as a gateway or proxy and received an invalid response from the upstream server.
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| 65 |
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| 66 | ;503 Service Unavailable
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| 67 | :The server is currently unavailable (because it is overloaded or down for maintenance). Generally, this is a temporary state.
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| 68 |
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| 69 | ;530 Site is frozen
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| 70 | :Some Internet companies use this to indicate that a site is down, but usage is non-standard, so the site will have to be tried again later to see if the outage is due to a frozen account or something else.
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