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 Informational 1xx 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. HTTP/1.1: Status Code Definitions

HTTP/1.1: Status Code Definitions

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Univeral Resource Identifiers -- Axioms of Web architecture Univeral Resource Identifiers -- Axioms of Web architecture Up to Design Issues Universal Resource Identifiers -- Axioms of Web Architecture The operation of the World Wide Web, and its interoperability between platforms of differing hardware and software manufacturers, depend on the specifications of protocols such as HTTP, data formats such as HTML, and other syntaxes such as the URL or, more generally, URI specifications.
What do HTTP URIs Identify? - Design Issues What do HTTP URIs Identify? - Design Issues Up to Design Issues Note: (2006). This architectural question has now been decided by the W3C TAG, in a compromise which I think works quite well, and is described in a later short note and a TAG finding. Background Note This question has been addressed only vaguely in the specifications. However, the lack of very concise logical definition of such things had not been a problem, until the formal systems started to use them.
GoodURIs - ESW Wiki GoodURIs - ESW Wiki What qualities make a URI work well in RDF and on the web in general? Unambiguous. Is there a consensus of meaning, where everyone using the URI as a name uses it to refer to essentially the same thing? Or is there confusion and disagreement among reasonable people?