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Example:
.. code-block:: python
# Request supports the .then() method.
p1 = http.Request('http://a')
p2 = http.Request('http://b')
p3 = http.Request('http://c')
requests = [p1, p2, p3]
def all_done():
pass # all requests complete
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# oops, we forgot we want another request
b.add(http.Request('http://d'))
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