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In the world of browser based development, interoperability is king. Unfortunately, interoperability can be at the expense of performance. With support for bi directional, full duplex messaging simply out of the reach of the HTTP protocol, real time messaging support in browser based applications can be severely limited. Fortunately, standards groups including the W3. C and IETF have been hard at work over the last few years on a standard specification called the Web. Socket protocol which aims to bring these much needed capabilities to the masses. As with most industry standards, the Web. Socket protocol has seen a significant amount of volatility over the last couple of years, but the good news is that the dust has settled making this a great time to start considering how Web. Sockets fits into your solution architectures. Why Web. Sockets Before I explain what the Web. Socket protocol is and how it works, let me talk about some of the challenges that it aims to solve. Todays applications demand real time, low latency messaging. Whether you are building a web, mobile or composite application, users expect to be able to interact with data as close to real time as possible while minimizing the impact to their overall user experience. The key to enabling real time, immersive experiences is to connect as closely as possible to the source of the events of interest so that when an event takes place, your application, service, or user experience is notified as quickly as possible. This isnt that big of a problem for applications and services within the enterprise that can leverage socket based messaging like TCP or UDP, but more and more applications are being built for the web and devices that rely entirely on the Internet for connectivity. Even enterprise applications today are becoming more and more dependent on services hosted by external vendorspartners and commercial cloud providers bringing hybrid solutions into the mainstream. There are many applications you likely interact with today that require this type of connectivity and yet deliver real time or near real time user experiences. If youve interacted with Twitter or Facebook, youve experienced near real time streams of activity constantly being updated all over the web, on your mobile device or browser without needing to hit a refresh button. Periodic Polling via XHROne common approach for delivering near real time messaging is commonly known as AJAX or XML Http Request XHR. This works by polling an endpoint at a given interval and returning data when it is available. Since there are no page refreshes or post backs happening, this gives the user the illusion of a dedicated connection, but the reality is that XHR is both latent and consumes resources and bandwidth with each subsequent poll. Long Polling. An alternative to XHR is long polling. With long polling, the serverendpoint holds on to the HTTP request until there is datapayload available and then returns to the client. The client then follows up with another request and waits until new data or eventpayload is available. While both of these approaches have powered a vast number of innovative solutions, they arent without liabilities. In addition to the high latency of both models, the programming model for each isnt the most intuitive. If youve worked with AJAXXHR or long polling, you may have gotten the feeling that theres a bit of magic happening under the hood because there is. In addition, scalability can become a problem as the number of clients increase. In addition, consuming endpoints that reside outside of applications domain requires clever hacks like JSONP or the use of non interoperable adapters. The Web. Socket Protocol. The Web. Socket protocol addresses many if not most of these issues by enabling fast, secure, two way communication between a client and a remote host without relying on multiple HTTP connections. Web. Sockets support full duplex, bi directional messaging, which is great for real time, low latency messaging scenarios. Best of all, Web. Sockets is fully interoperable and cross platform at the browser level, natively supporting ports 8. There are two parts to the Web. Socket protocol client and server. The W3. C owns the Java. Script client API and the IETF Hypertext Bidirectional Hy. Bi Working Group is responsible for guidelines governing how the server side protocol should be implemented. Browser vendors like Google, Microsoft and Mozilla natively support the Web. Socket protocol by implementing the client API directly in their browsers. This means that if Chrome or IE support Web. Sockets, the API is native to the browser and you can start programming against Web. Socket endpoints right away. On the server side, platform vendors implement the IETF specification providing middleware tooling that enables you to expose your back end services over the Web. Socket protocol. How it Works. As shown in Figure 3, when a Web. Socket enabled browserclient establishes a connection to a Web. Socket endpoint, it conducts a handshake over port 8. Web. Socket protocol. If the server supports the Web. Socket protocol, and the protocol version of the client and server match, the web server will accept the upgrade request and upgrade the request. From this point on, the client and server have a direct, socket connection and can freely exchange messages. Figure 1 Periodic polling with XML HTTP Request. Figure 2 With long polling, the server holds on to the HTTP request until there is data available. Figure 3 Web. Sockets handshake and messaging. Lets take a look at what the HTTP request and response from step 2 above looks like GET ws localhostTweet. Stream. Service. Twitter. Stream. Service. Connection Upgrade. Host localhost 8. Sec Web. Socket Key Gle. UPij. Qdf. EAx. Sy. UGq. Nugw. Sec Web. Socket Version 1. Upgrade websocket. The first thing youll notice is that this is just an HTTP GET request. However, the URI is using a protocol scheme of ws. All Web. Socket endpoints must be addressed in this manner. Everything after the prefix is that of a typical URI, including the server and resource path. In this case, Im addressing a WCF service that implements the Web. Socket protocol, but this is just one implementation option well explore along with others. The Origin request header is optional and can be used to demarcate the domain in which the communication will take place. Using this header, the server can decide to only serve requests originating from a given domain and reject all others. It is in this way that cross domain connections are implicitly supported but can be constrained as needed. Next, notice that the Connection request header is set to Upgrade. This is to indicate that the client is requesting an upgrade to the Web. Socket protocol, specified in the Upgrade header if the server supports it. The Sec Web. Socket Key header consists of a hash which prevents an intermediary from impersonating the server more on this in a bit. Finally, the Sec Web. Socket Version header indicates the protocol version which the client supports, which maps to the hybi server reference, in this case IETF RFC 6. If the server supports Web. Sockets and the versions are compatible, the server will respond as follows HTTP1. Switching Protocols. Connection Upgrade. Sec Web. Socket Accept t. R1jreg. 0c. IPCg. Uc. Tub. HV5. M. Upgrade websocket. Thread RESOLVED Prevent a computer from entering SleepStandbyHibernate while program is running. Public Class SPI        lt System. Runtime. Interop. Services. Dll. ImportUser. Entry. Point System. Parameters. Info         Private Shared Function System. Parameters. Info. GetBy. Val u. Action As SPI. Get. Actions, By. Val ui. Param As UInt. By. Ref pv. Param As Int. Ptr, By. Val fu. Win. Ini As UInt. 32As. Boolean        End. Function        lt System. Runtime. Interop. Services. Dll. ImportUser. Entry. Point System. Parameters. Info         Private Shared Function System. Parameters. Info. SetBy. Val u. Action As SPI. Set. Actions, By. Val ui. Param As UInt. By. Val pv. Param As Int. Ptr, By. Val fu. Win. Ini As UInt. 32As. Boolean        End. Function        Public. Enum Get. Actions As UInt. ICONHORIZONTALSPACING HD            ICONVERTICALSPACING H1. BEEP H1            MOUSE H3            BORDER H5            KEYBOARDSPEED HA            SCREENSAVETIMEOUT HE            SCREENSAVEACTIVE H1. GRIDGRANULARITY H1. KEYBOARDDELAY H1. ICONTITLEWRAP H1. MENUDROPALIGNMENT H1. B            ICONTITLELOGFONT H1. F            FASTTASKSWITCH H2. DRAGFULLWINDOWS H2. NONCLIENTMETRICS H2. MINIMIZEDMETRICS H2. B            ICONMETRICS H2. D            WORKAREA H3. HIGHCONTRAST H4. KEYBOARDPREF H4. SCREENREADER H4. ANIMATION H4. FONTSMOOTHING H4. A            LOWPOWERTIMEOUT H4. F            POWEROFFTIMEOUT H5. LOWPOWERACTIVE H5. POWEROFFACTIVE H5. DEFAULTINPUTLANG H5. WINDOWSEXTENSION H5. C            MOUSETRAILS H5. E            FILTERKEYS H3. TOGGLEKEYS H3. MOUSEKEYS H3. SHOWSOUNDS H3. STICKYKEYS H3. A            ACCESSTIMEOUT H3. C            SERIALKEYS H3. E            SOUNDSENTRY H4. SNAPTODEFBUTTON H5. F            MOUSEHOVERWIDTH H6. MOUSEHOVERHEIGHT H6. MOUSEHOVERTIME H6. WHEELSCROLLLINES H6. MENUSHOWDELAY H6. A            WHEELSCROLLCHARS H6. C            SCREENSAVERRUNNING H7. MOUSESPEED H7. DESKWALLPAPER H7. AUDIODESCRIPTION H7. SCREENSAVESECURE H7. SHOWIMEUI H6. E            ACTIVEWINDOWTRACKING H1. MENUANIMATION H1. COMBOBOXANIMATION H1. LISTBOXSMOOTHSCROLLING H1. GRADIENTCAPTIONS H1. KEYBOARDCUES H1. A            MENUUNDERLINES KEYBOARDCUES            ACTIVEWNDTRKZORDER H1. C            HOTTRACKING H1. E            MENUFADE H1. SELECTIONFADE H1. TOOLTIPANIMATION H1. TOOLTIPFADE H1. CURSORSHADOW H1. A            MOUSESONAR H1. C            MOUSECLICKLOCK H1. E            MOUSEVANISH H1. FLATMENU H1. DROPSHADOW H1. BLOCKSENDINPUTRESETS H1. UIEFFECTS H1. E            DISABLEOVERLAPPEDCONTENT H1. CLIENTAREAANIMATION H1. CLEARTYPE H1. SPEECHRECOGNITION H1. A            FOREGROUNDLOCKTIMEOUT H2. ACTIVEWNDTRKTIMEOUT H2. FOREGROUNDFLASHCOUNT H2. CARETWIDTH H2. MOUSECLICKLOCKTIME H2. FONTSMOOTHINGTYPE H2. A            FONTSMOOTHINGCONTRAST H2. C            FOCUSBORDERWIDTH H2. E            FOCUSBORDERHEIGHT H2. FONTSMOOTHINGORIENTATION H2. MINIMUMHITRADIUS H2. MESSAGEDURATION H2. End. Enum        Public. Enum Set. Actions As UInt. BEEP H2            MOUSE H4            BORDER H6            KEYBOARDSPEED HB            SCREENSAVETIMEOUT HF            SCREENSAVEACTIVE H1. GRIDGRANULARITY H1. DESKWALLPAPER H1. DESKPATTERN H1. KEYBOARDDELAY H1. ICONTITLEWRAP H1. A            MENUDROPALIGNMENT H1. C            DOUBLECLKWIDTH H1. D            DOUBLECLKHEIGHT H1. E            DOUBLECLICKTIME H2. MOUSEBUTTONSWAP H2. ICONTITLELOGFONT H2. FASTTASKSWITCH H2. DRAGFULLWINDOWS H2. NONCLIENTMETRICS H2. A            MINIMIZEDMETRICS H2. C            ICONMETRICS H2. E            WORKAREA H2. F            PENWINDOWS H3. HIGHCONTRAST H4. KEYBOARDPREF H4. SCREENREADER H4. ANIMATION H4. FONTSMOOTHING H4. B            DRAGWIDTH H4. C            DRAGHEIGHT H4. D            HANDHELD H4. E            LOWPOWERTIMEOUT H5. POWEROFFTIMEOUT H5. LOWPOWERACTIVE H5. POWEROFFACTIVE H5. CURSORS H5. ICONS H5. DEFAULTINPUTLANG H5. A            LANGTOGGLE H5. B            MOUSETRAILS H5. D            SCREENSAVERRUNNING H6. FILTERKEYS H3. TOGGLEKEYS H3. MOUSEKEYS H3. SHOWSOUNDS H3. STICKYKEYS H3. B            ACCESSTIMEOUT H3. D            SERIALKEYS H3. F            SOUNDSENTRY H4. SNAPTODEFBUTTON H6. MOUSEHOVERWIDTH H6. MOUSEHOVERHEIGHT H6. MOUSEHOVERTIME H6. WHEELSCROLLLINES H6. MENUSHOWDELAY H6. B            WHEELSCROLLCHARS H6. D            SHOWIMEUI H6. F            MOUSESPEED H7. AUDIODESCRIPTION H7. SCREENSAVESECURE H7. ACTIVEWINDOWTRACKING H1. MENUANIMATION H1. COMBOBOXANIMATION H1. LISTBOXSMOOTHSCROLLING H1. GRADIENTCAPTIONS H1. KEYBOARDCUES H1. B            MENUUNDERLINES KEYBOARDCUES            ACTIVEWNDTRKZORDER H1. D            HOTTRACKING H1. F            MENUFADE H1. SELECTIONFADE H1. TOOLTIPANIMATION H1. TOOLTIPFADE H1. CURSORSHADOW H1. B            MOUSESONAR H1. D            MOUSECLICKLOCK H1. F            MOUSEVANISH H1. FLATMENU H1. DROPSHADOW H1. BLOCKSENDINPUTRESETS H1. UIEFFECTS H1. F            DISABLEOVERLAPPEDCONTENT H1. Prezi Download Free For Windows Crack File here. CLIENTAREAANIMATION H1. CLEARTYPE H1. SPEECHRECOGNITION H1. B            FOREGROUNDLOCKTIMEOUT H2. ACTIVEWNDTRKTIMEOUT H2. FOREGROUNDFLASHCOUNT H2. CARETWIDTH H2. MOUSECLICKLOCKTIME H2. FONTSMOOTHINGTYPE H2. B            FONTSMOOTHINGCONTRAST H2. D            FOCUSBORDERWIDTH H2. F            FOCUSBORDERHEIGHT H2. FONTSMOOTHINGORIENTATION H2. MINIMUMHITRADIUS H2. MESSAGEDURATION H2. End. Enum        Public. Enum Font. Smoothing As Int. STANDARD H1            CLEARTYPE H2            DOCKING H8. End. Enum        Public. Enum Font. Smoothing. Orientation As Int. BGR H0            RGB H1        End. Enum        Public Shared Function Set. ParameterBy. Val parameter As Set. Actions, By. Val uparam As UInteger, By. Val pv. Param As Int. PtrAs. Boolean            Return System. Parameters. Info. Setparameter, uparam, pv. Param, 1        End. Function        Public Shared Function Set. ParameterBy. Val parameter As Set. Actions, By. Val pv. Param As Int. PtrAs. Boolean            Return Set. Parameterparameter, 0, pv. Param        End. Function        Public Shared Function Get. ParameterBy. Val parameter As Get. ActionsAs Int. Ptr            System. Parameters. Info. Getparameter, 0, Get. Parameter, 0        End. Function    End Class.