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22 lines
1.1 KiB
JavaScript
22 lines
1.1 KiB
JavaScript
dojo.provide("dojox.rpc.Client");
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// Provide extra headers for robust client and server communication
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(function() {
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dojo._defaultXhr = dojo.xhr;
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dojo.xhr = function(method,args){
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var headers = args.headers = args.headers || {};
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// set the client id, this can be used by servers to maintain state information with the
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// a specific client. Many servers rely on sessions for this, but sessions are shared
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// between tabs/windows, so this is not appropriate for application state, it
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// really only useful for storing user authentication
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headers["Client-Id"] = dojox.rpc.Client.clientId;
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// set the sequence id. HTTP is non-deterministic, message can arrive at the server
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// out of order. In complex Ajax applications, it may be more to ensure that messages
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// can be properly sequenced deterministically. This applies a sequency id to each
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// XHR request so that the server can order them.
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headers["Seq-Id"] = dojox._reqSeqId = (dojox._reqSeqId||0)+1;
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return dojo._defaultXhr.apply(dojo,arguments);
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}
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})();
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// initiate the client id to a good random number
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dojox.rpc.Client.clientId = (Math.random() + '').substring(2,14);
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