We need someone to review the boost::asio example

[Ray Satiro via curl-library]

libcurl example asiohiper [1] uses boost::asio and is not working 
properly [2]. If you're familiar with boost::asio can you please review 
the example to see if anything looks wrong? Thanks

[1]: https://github.com/curl/curl/blob/master/docs/examples/asiohiper.cpp
[2]: https://github.com/curl/curl/issues/1170
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