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POHow to easily listen for xhr requests with javascript?
 

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  1. POHow to easily listen for xhr requests with javascript?
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    <p>I am working on a firefox extension and I want to know when a page initiates a xhr request, i saw a few codes but they were pretty big, is there any simple sample to achieve this?</p> <p>I am testing this code :</p> <pre><code>function TracingListener() { //this.receivedData = []; } TracingListener.prototype = { originalListener: null, receivedData: null, // array for incoming data. onDataAvailable: function(request, context, inputStream, offset, count) { var binaryInputStream = CCIN("@mozilla.org/binaryinputstream;1", "nsIBinaryInputStream"); var storageStream = CCIN("@mozilla.org/storagestream;1", "nsIStorageStream"); binaryInputStream.setInputStream(inputStream); storageStream.init(8192, count, null); var binaryOutputStream = CCIN("@mozilla.org/binaryoutputstream;1", "nsIBinaryOutputStream"); binaryOutputStream.setOutputStream(storageStream.getOutputStream(0)); // Copy received data as they come. var data = binaryInputStream.readBytes(count); //var data = inputStream.readBytes(count); this.receivedData.push(data); binaryOutputStream.writeBytes(data, count); this.originalListener.onDataAvailable(request, context,storageStream.newInputStream(0), offset, count); }, onStartRequest: function(request, context) { this.receivedData = []; this.originalListener.onStartRequest(request, context); }, onStopRequest: function(request, context, statusCode) { try { request.QueryInterface(Ci.nsIHttpChannel); if (request.originalURI &amp;&amp; piratequesting.baseURL == request.originalURI.prePath &amp;&amp; request.originalURI.path.indexOf("/index.php?ajax=") == 0) { var data = null; if (request.requestMethod.toLowerCase() == "post") { var postText = this.readPostTextFromRequest(request, context); if (postText) data = ((String)(postText)).parseQuery(); } var date = Date.parse(request.getResponseHeader("Date")); var responseSource = this.receivedData.join(''); //fix leading spaces bug responseSource = responseSource.replace(/^\s+(\S[\s\S]+)/, "$1"); piratequesting.ProcessRawResponse(request.originalURI.spec, responseSource, date, data); } } catch (e) { dumpError(e); } this.originalListener.onStopRequest(request, context, statusCode); }, QueryInterface: function (aIID) { if (aIID.equals(Ci.nsIStreamListener) || aIID.equals(Ci.nsISupports)) { return this; } throw Components.results.NS_NOINTERFACE; }, readPostTextFromRequest : function(request, context) { try { var is = request.QueryInterface(Ci.nsIUploadChannel).uploadStream; if (is) { var ss = is.QueryInterface(Ci.nsISeekableStream); var prevOffset; if (ss) { prevOffset = ss.tell(); ss.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0); } // Read data from the stream.. var charset = "UTF-8"; var text = this.readFromStream(is, charset, true); // Seek locks the file so, seek to the beginning only if necko hasn't read it yet, // since necko doesn't seek to 0 before reading (at lest not till 459384 is fixed). if (ss &amp;&amp; prevOffset == 0) ss.seek(Ci.nsISeekableStream.NS_SEEK_SET, 0); return text; } else { dump("Failed to Query Interface for upload stream.\n"); } } catch(exc) { dumpError(exc); } return null; }, readFromStream : function(stream, charset, noClose) { var sis = CCSV("@mozilla.org/binaryinputstream;1", "nsIBinaryInputStream"); sis.setInputStream(stream); var segments = []; for (var count = stream.available(); count; count = stream.available()) segments.push(sis.readBytes(count)); if (!noClose) sis.close(); var text = segments.join(""); return text; } } hRO = { observe: function(request, aTopic, aData){ try { if (typeof Cc == "undefined") { var Cc = Components.classes; } if (typeof Ci == "undefined") { var Ci = Components.interfaces; } if (aTopic == "http-on-examine-response") { request.QueryInterface(Ci.nsIHttpChannel); //if (request.originalURI &amp;&amp; piratequesting.baseURL == request.originalURI.prePath) { // var newListener = new TracingListener(); //request.QueryInterface(Ci.nsITraceableChannel); //newListener.originalListener = request.setNewListener(newListener); //} GOOGLE FAILS TO LOAD IF I UNCOMMENT THIS } } catch (e) { dump("\nhRO error: \n\tMessage: " + e.message + "\n\tFile: " + e.fileName + " line: " + e.lineNumber + "\n"); } }, QueryInterface: function(aIID){ if (typeof Cc == "undefined") { var Cc = Components.classes; } if (typeof Ci == "undefined") { var Ci = Components.interfaces; } if (aIID.equals(Ci.nsIObserver) || aIID.equals(Ci.nsISupports)) { return this; } throw Components.results.NS_NOINTERFACE; }, }; var observerService = Cc["@mozilla.org/observer-service;1"] .getService(Ci.nsIObserverService); observerService.addObserver(hRO, "http-on-examine-response", false); </code></pre> <p>But in observe when adding the newListener, if I uncomment that part sites like google (with instant search feature) wont load at all, I would like to be able to read responseSource on onStopRequest, I tried adding an alert but it never fires and it mess up sites like I said it happens with google instant search.</p>
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