function handleRequest(request, response) { var file = Services.dirsvc.get("CurWorkD", Ci.nsIFile); file.append("tests"); file.append("image"); file.append("test"); file.append("mochitest"); if (request.getHeader("Accept") == "image/png") { file.append("blue.png"); } else { file.append("red.png"); } response.setStatusLine(request.httpVersion, 200, "OK"); response.setHeader("Content-Type", "image/png", false); response.setHeader("Cache-Control", "no-cache", false); var fileStream = Cc[ "@mozilla.org/network/file-input-stream;1" ].createInstance(Ci.nsIFileInputStream); fileStream.init(file, 1, 0, false); var binaryStream = Cc["@mozilla.org/binaryinputstream;1"].createInstance( Ci.nsIBinaryInputStream ); binaryStream.setInputStream(fileStream); response.bodyOutputStream.writeFrom(binaryStream, binaryStream.available()); binaryStream.close(); fileStream.close(); }