![]() In this way, a two-way ongoing conversation can take place between the client and the server. This is made possible by providing a standardized way for the server to send content to the client without being first requested by the client, and allowing messages to be passed back and forth while keeping the connection open. The WebSocket protocol enables interaction between a web browser (or other client application) and a web server with lower overhead than half-duplex alternatives such as HTTP polling, facilitating real-time data transfer from and to the server. ELINKS REFRESH CONFIG UPGRADETo achieve compatibility, the WebSocket handshake uses the HTTP Upgrade header to change from the HTTP protocol to the WebSocket protocol. Although they are different, RFC 6455 states that WebSocket "is designed to work over HTTP ports 443 and 80 as well as to support HTTP proxies and intermediaries", thus making it compatible with HTTP. Both protocols are located at layer 7 in the OSI model and depend on TCP at layer 4. It is a living standard maintained by the WHATWG and a successor to The WebSocket API from the W3C. The current API specification allowing web applications to use this protocol is known as WebSockets. The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011. WebSocket is a computer communications protocol, providing full-duplex communication channels over a single TCP connection. HTTP, Archeology and Web Compatibility issues that seems to be close enough from my vices.A diagram describing a connection using WebSocket If I was silly enough, maybe I would do this. Maybe it would be worth to document indeed how it is working as implemented now and how it is supposed to be working when there's no interoperability. Should it be documented? Well, there are plenty of issues, there are plenty of hacks around it. Refresh is no longer in the HTTP/1.1 document - it has been deferred to To individual objects (RE: the message below to netscape). My concern with "Refresh" is that I do not want it to be a globalĬoncept (a browser can only keep track of one refresh)-it looks to be In June 1996, Jerry Jongerius posted about HTTP/1.1 Refresh header field comments So another thing you obviously want to do, in addition to causing the currentÄocument to reload, is to cause another document to be reloaded in n seconds (Thanks to SecuriTeam Web site and Amit Klein) The earliest mention seems to be An Exploration Of Dynamic Documents I can't find anywhere the documentation for Refresh HTTP header on old Netscape Web sites. I can find very early references of meta refresh such as in Netscape Developer documentation. My guess is the 301 always win with the Location HTTP header, or at least it's what I hope. HTTP / 1.1 301 Permanent Redirect Refresh : 0 url= Location : ELINKS REFRESH CONFIG CODEThen what about scripts, stylesheets, JSON files, HTML document in iframes, etc? For the SetupRefreshURIFromHeader code, there are Web Compatibility hacks in the source code of Firefox. For now, the refresh is not done for inline resources. The bug is what the browser should do when the Refresh HTTP header is on an image included in a Web page (this could be another test). This bug about inline resources is quite interesting and might indeed need to be addressed if there was a documentation. On Mozilla bug tracker, there are a certain number of bugs around refresh. If someone could test for IE and Chrome at least. Yes - Chrome (something) said Hallvord ).HTTP / 1.1 200 OK Accept-Ranges : bytes Connection : Keep-Alive Content-Length : 200 Content-Type : text/html charset=utf-8 Date : Thu, 05:48:57 GMT ETag : "c8-5122a67ec0240" Expires : Thu, 05:48:57 GMT Keep-Alive : timeout=5, max=100 Last-Modified : Thu, 05:37:05 GMT Refresh : 0 url= ![]()
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