Jump to RFCs - [RFC ] Hypertext Transfer Protocol -- HTTP/ Category: Informational. [RFC ] Use and interpretation of HTTP version numbers. RFC HTTP/ May request An HTTP request message (as defined in Section 5). response An HTTP response message (as defined in Section 6). RFC HTTP/ June Table of Contents 1 Introduction. HTTP/, as defined by RFC [6], improved the protocol by allowing messages to be.


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An HTTP response is made by a server to a client.

RFC - Hypertext Transfer Protocol HTTP/

http rfc 1945 Despite the prescribed safety of GET requests, in practice their handling by the server is not technically limited in any way. Therefore, careless or deliberate programming can cause non-trivial changes on the server.

This is discouraged, because it http rfc 1945 cause problems for web cachingsearch engines and other automated agents, which can make unintended changes on the server.

For example, a website might allow deletion of a resource through a URL such as http: The beta was suspended only weeks after its first release, following widespread criticism. In some cases http rfc 1945 may be desirable, http rfc 1945 in other cases this could be due to an accident, such as when a user does not realize that their action will result in sending another request, or they did not receive adequate feedback that their first request was successful.

While web browsers may show alert dialog boxes to warn users in some cases where reloading a page may re-submit a POST request, it is generally up to the web application to handle cases where a POST request should not be submitted more than once.

Note that whether a method is idempotent is not enforced by the protocol or web server. Some optional elements specified by RFC have been removed from this specification due to problems found since its publication; other new elements have been added for compatibility, those new elements have been made optional, but are strongly recommended.

Like Basic, Digest access authentication verifies that both parties to a communication know a shared secret a password ; unlike Basic, this verification can be done without sending the http rfc 1945 in the clear, which is Basic's biggest weakness. As with most other authentication protocols, the greatest sources of risks are usually found not in the core protocol itself but in policies and procedures surrounding its use.

Some confusion exists concerning the proper use and interpretation of HTTP version numbers, and concerning interoperability of HTTP http rfc 1945 of different protocol versions.

The HTTP protocol

RFC The time at which the origin server intends that an entity should no longer be returned by a cache without further validation. RFC A response is first-hand if it comes directly and without unnecessary delay from http rfc 1945 origin server, perhaps via one or more proxies.

A response is also http rfc 1945 if its validity has just been checked directly with the origin server. RFC A response is fresh if its age has not yet exceeded its freshness lifetime. RFC The length of time between the generation of a response and its expiration time.

RFC A server which acts as an intermediary for some other server.


Unlike a proxy, a gateway receives requests as if it were the origin server for the requested resource; the http rfc 1945 client may not be aware that it is communicating with a gateway. Gateways are often used as server-side portals through network firewalls and as protocol translators for access to resources stored on non-HTTP systems.


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