part of Hypertext Transfer Protocol -- HTTP/1.1 RFC 2616 Fielding, et al. 10 Each Status-Code is described below, including a description of which method(s) it can follow and any metainformation required in the response. 10.1 This class of status code indicates a provisional response, consisting only of the Status-Line and optional headers, and is terminated by an empty line. There are no required headers for this class of status code. Since HTTP/1.0 did not define any 1xx status codes, servers MUST NOT send a 1xx response to an HTTP/1.0 client except under experimental conditions. A client MUST be prepared to accept one or more 1xx status responses prior to a regular response, even if the client does not expect a 100 (Continue) status message. Unexpected 1xx status responses MAY be ignored by a user agent. Proxies MUST forward 1xx respons...