How can I use deflated/gzipped content with an XHR onProgress function?

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A slightly more elegant variation on your solution would be to set a header like ‘x-decompressed-content-length’ or whatever in your HTTP response with the full decompressed value of the content in bytes and read it off the xhr object in your onProgress handler.

Your code might look something like:

request.onProgress = function (e) {
  var contentLength;
  if (e.lengthComputable) {
    contentLength = e.total;
  } else {
    contentLength = parseInt(e.target.getResponseHeader('x-decompressed-content-length'), 10);
  }
  progressIndicator.update(e.loaded / contentLength);
};

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