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    <p>It is possible but you need to do a few things:</p> <ul> <li>Fake out the urllib2 subsystem into passing a file handle down to httplib by attaching a <code>__len__</code> attribute which makes <code>len(data)</code> return the correct size, used to populate the Content-Length header.</li> <li>Override the <code>read()</code> method on your file handle: as httplib calls <code>read()</code> your callback will be invoked, letting you calculate the percentage and update your progress bar.</li> </ul> <p>This could work with any file-like object, but I've wrapped <code>file</code> to show how it could work with a really large file streamed from disk:</p> <pre><code>import os, urllib2 from cStringIO import StringIO class Progress(object): def __init__(self): self._seen = 0.0 def update(self, total, size, name): self._seen += size pct = (self._seen / total) * 100.0 print '%s progress: %.2f' % (name, pct) class file_with_callback(file): def __init__(self, path, mode, callback, *args): file.__init__(self, path, mode) self.seek(0, os.SEEK_END) self._total = self.tell() self.seek(0) self._callback = callback self._args = args def __len__(self): return self._total def read(self, size): data = file.read(self, size) self._callback(self._total, len(data), *self._args) return data path = 'large_file.txt' progress = Progress() stream = file_with_callback(path, 'rb', progress.update, path) req = urllib2.Request(url, stream) res = urllib2.urlopen(req) </code></pre> <p>Output:</p> <pre><code>large_file.txt progress: 0.68 large_file.txt progress: 1.36 large_file.txt progress: 2.04 large_file.txt progress: 2.72 large_file.txt progress: 3.40 ... large_file.txt progress: 99.20 large_file.txt progress: 99.87 large_file.txt progress: 100.00 </code></pre>
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    1. COWhy did you put the _len_ method? I don't see where httplib or you use it, what's the purpose?
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    2. COIt is used in `urllib2` `AbstractHTTPHandler.do_request_()` and in `httplib HttpConnect._send_request()`, where `len(<file obj>)` is called to set the `Content-length` header.
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    3. COelegant solution, thanks!
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