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An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.
1xx—Provisional Responses. 100 Trying. Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [ 1]: §21.1.1. 180 Ringing. Destination user agent received INVITE, and is alerting user of call. [ 1]: §21.1.2. 181 Call is Being Forwarded.
In HTTP/1.0 and since, the first line of the HTTP response is called the status line and includes a numeric status code (such as "404") and a textual reason phrase (such as "Not Found"). The response status code is a three-digit integer code representing the result of the server's attempt to understand and satisfy the client's corresponding ...
The webserver software developed by Microsoft, Microsoft's Internet Information Services (IIS), returns a set of substatus codes with its 404 responses. The substatus codes take the form of decimal numbers appended to the 404 status code. The substatus codes are not officially recognized by IANA and are not returned by non-Microsoft servers.
Experimental. The HTTP status code 402 is currently classified as an experimental code within the HTTP protocol. Such experimental codes are introduced to assess new features or ideas and determine their practical application. The designation of the 402 status implies that a payment is mandated to obtain a particular resource or service.
List of HTTP status codes#400. This page is a redirect. The following categories are used to track and monitor this redirect: From a code: This is a redirect from a code that has no distinctive category to which it may be sorted. Examples are DOCTYPE, and redirects from HTML and hexadecimal codes. To an embedded anchor: This is a redirect from ...
400 is the square of 20. 400 is the sum of the powers of 7 from 0 to 3, thus making it a repdigit in base 7 ... HTTP status code for "Proxy Authentication Required"
It should only contain pages that are Hypertext Transfer Protocol status codes or lists of Hypertext Transfer Protocol status codes, as well as subcategories containing those things (themselves set categories). Topics about Hypertext Transfer Protocol status codes in general should be placed in relevant topic categories