gecko-dev/content/media/test/noContentLength.sjs

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// Serve a media file without using content-range header
function handleRequest(request, response)
{
var file = Components.classes["@mozilla.org/file/directory_service;1"].
getService(Components.interfaces.nsIProperties).
get("CurWorkD", Components.interfaces.nsILocalFile);
var fis = Components.classes['@mozilla.org/network/file-input-stream;1'].
createInstance(Components.interfaces.nsIFileInputStream);
var bis = Components.classes["@mozilla.org/binaryinputstream;1"].
createInstance(Components.interfaces.nsIBinaryInputStream);
var paths = "tests/content/media/test/320x240.ogv";
var split = paths.split("/");
for(var i = 0; i < split.length; ++i) {
file.append(split[i]);
}
fis.init(file, -1, -1, false);
bis.setInputStream(fis);
var bytes = bis.readBytes(bis.available());
response.setStatusLine(request.httpVersion, 200, "Content Follows");
response.setHeader("Content-Type", "video/ogg", false);
response.write(bytes, bytes.length);
// Make this request async to prevent a default Content-Length from being provided.
response.processAsync();
response.finish();
bis.close();
}