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Precondition Required

This request is required to be conditional; try using "If-Match".

Responses with the 428 status code MUST NOT be stored by a cache.4. 429 Too Many Requests The 429 status code indicates that the user has sent too many requests in a given amount of time ("rate limiting"). The response representations SHOULD include details explaining the condition, and MAY include a Retry-After header indicating how long to wait before making a new request. For example: HTTP/1.1 429 Too Many Requests Content-Type: text/html Retry-After: 3600Too Many Requests

Too Many Requests

I only allow 50 requests per hour to this Web site per logged in user. Try again soon.

Note that this specification does not define how the origin server identifies the user, nor how it counts requests. For example, an origin server that is limiting request rates can do so based upon counts of requests on a per-resource basis, across the entire server, or even among a set of servers. Likewise, it might identify the user by its authentication credentials, or a stateful cookie. Responses with the 429 status code MUST NOT be stored by a cache.Nottingham & Fielding Standards Track [Page 3]RFC 6585 Additional HTTP Status Codes April 20125. 431 Request Header Fields Too Large The 431 status code indicates that the server is unwilling to process the request because its header fields are too large. The request MAY be resubmitted after reducing the size of the request header fields. It can be used both when the set of request header fields in total is too large, and when a single header field is at fault. In the latter case, the response representation SHOULD specify which header field was too large. For example: HTTP/1.1 431 Request Header Fields Too Large Content-Type: text/htmlRequest Header Fields Too Large

Request Header Fields Too Large

The "Example" header was too large.

Responses with the 431 status code MUST NOT be stored by a cache.6. 511 Network Authentication Required The 511 status code indicates that the client needs to authenticate to gain network access. The response representation SHOULD contain a link to a resource that allows the user to submit credentials (e.g., with an HTML form). Note that the 511 response SHOULD NOT contain a challenge or the login interface itself, because browsers would show the login interface as being associated with the originally requested URL, which may cause confusion. The 511 status SHOULD NOT be generated by origin servers; it is intended for use by intercepting proxies that are interposed as a means of controlling access to the network. Responses with the 511 status code MUST NOT be stored by a cache.Nottingham & Fielding Standards Track [Page 4]RFC 6585 Additional HTTP Status Codes April 20126.1. The 511 Status Code and Captive Portals The 511 status code is designed to mitigate problems caused by "captive portals" to software (especially non-browser agents) that is expecting a response from the server that a request was made to, not the intervening network infrastructure. It is not intended to encourage deployment of captive portals -- only to limit the damage caused by them. A network operator wishing to require some authentication, acceptance of terms, or other user interaction before granting access usually does so by identifying clients who have not done so ("unknown clients") using their Media Access Control (MAC) addresses. Unknown clients then have all traffic blocked, except for that on TCP port 80, which is sent to an HTTP server (the "login server") dedicated to "logging in" unknown clients, and of course traffic to the login server itself. For example, a user agent might connect to a network and make the following HTTP request on TCP port 80: GET /index.htm HTTP/1.1 Host: www.example.com Upon receiving such a request, the login server would generate a 511 response: HTTP/1.1 511 Network Authentication Required Content-Type: text/htmlNetwork Authentication Required

You need to authenticate with the local network in order to gain access.

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