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< title > Cosmopolite</ title >
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< h1 class = "header" > Cosmopolite</ h1 >
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< p class = "header" > Client/server publish/subscribe, presence and key/value storage for AppEngine</ p >
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< li class = "download" >< a class = "buttons" href = "https://github.com/flamingcowtv/cosmopolite/zipball/master" > Download ZIP</ a ></ li >
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< li >< a class = "buttons github" href = "https://github.com/flamingcowtv/cosmopolite" > View On GitHub</ a ></ li >
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< a name = "cosmopolite" class = "anchor" href = "#cosmopolite" >< span class = "octicon octicon-link" ></ span ></ a > Cosmopolite</ h1 >
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< p > Client/server publish/subscribe, presence and key/value storage for < a href = "https://developers.google.com/appengine/" > AppEngine</ a > .</ p >
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< h3 > Dig in</ h3 >
< ul >
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< li style = "font-weight: bold;" > Read < a href = "overview" > the overview</ a ></ li >
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< li style = "font-weight: bold;" > Read < a href = "tutorial" > the tutorial</ a ></ li >
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< li style = "font-weight: bold;" > Try out < a href = "https://playground.cosmopolite.org/cosmopolite/static/debug.html" > the playground</ a ></ li >
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< h3 > Components</ h3 >
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< li > A server API built on the < a href = "https://developers.google.com/appengine/docs/python/" > AppEngine Python framework</ a > .</ li >
< li > A browser client library written in JavaScript.</ li >
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< h3 > Feature overview</ h3 >
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< li > Near-realtime notification to subscribers of messages published to a "subject"</ li >
< li > Server-side storage of past messages for replay later to clients</ li >
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< li > Ephemeral messages tied to client connection that can be used for presence information</ li >
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< li > Client identification persistence via < a href = "http://www.w3schools.com/html/html5_webstorage.asp" > localStorage</ a > tokens or in combination with < a href = "https://developers.google.com/appengine/docs/python/users/" > Google account signin</ a ></ li >
< li > Complex messages supported via transparent < a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON" > JSON</ a > serialization</ li >
< li > Server-side strict ordering of messages</ li >
< li > Client-side message queueing in localStorage and resumption on restart</ li >
< li > Message duplication detection and elimination</ li >
< li >< a href = "https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise" > Promise</ a > support for notification of client -> server operation completion</ li >
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