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copied!<p>The example you have there is meant for a classic (XUL-based) extension, not for the Add-on SDK. You can still add that observer using the <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/1.9/packages/api-utils/observer-service.html" rel="nofollow">low-level <code>observer-service</code> API</a>. Also, SDK-based extensions don't usually have access to the <code>Components</code> object, it requires <a href="https://addons.mozilla.org/en-US/developers/docs/sdk/1.9/dev-guide/tutorials/chrome.html" rel="nofollow">chrome authority</a>. Add the following code to your <code>main.js</code> file:</p> <pre class="lang-js prettyprint-override"><code>var observer = require("observer-service"); var {Cc, Ci} = require("chrome"); observer.add("http-on-modify-request", function(subject, data) { var channel= subject.QueryInterface(Ci.nsIHttpChannel); if (channel.requestMethod == "POST") { channel = channel.QueryInterface(Ci.nsIUploadChannel); channel = channel.uploadStream; channel.QueryInterface(Ci.nsISeekableStream) .seek(Ci.nsISeekableStream.NS_SEEK_SET, 0); var stream = Cc["@mozilla.org/binaryinputstream;1"] .createInstance(Ci.nsIBinaryInputStream); stream.setInputStream(channel); var postBytes = stream.readByteArray(stream.available()); poststr = String.fromCharCode.apply(null, postBytes); //change the poststr // poststr=poststr.replace(....); // ERROR HERE - stringStream is not defined stringStream.setData(poststr, poststr.length); //changing the postdata channel = channel.QueryInterface(Ci.nsIUploadChannel); channel = channel.uploadStream; channel.QueryInterface(Ci.nsISeekableStream) .seek(Ci.nsISeekableStream.NS_SEEK_SET, 0); channel.uploadStream.QueryInterface(Ci.nsIMIMEInputStream); channel.uploadStream.setData(stringStream); channel.requestMethod = "POST"; } }); </code></pre> <p>Note that I merely replaced <code>Components.classes</code> by <code>Cc</code> and <code>Components.interfaces</code> by <code>Ci</code> in the code you provided - I'm not sure what this code is supposed to do but I am quite sure that it doesn't work.</p>

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