fix init zlib.

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fix proxy port.

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remove lexical_cast.hpp

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add AUTHORS
improve rangefield.hpp

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add encode_base64

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Improve auth for http proxy.

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change comment for http_pw.

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Merge branch 'master' of github.com:avplayer/avhttp
fix user buffer length is 0, zlib decode error.

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optimize the processing zlib.

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code style.

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update version to 2.9.3

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rename async_http_stream.sln to async_http_stream_2005.sln

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rename sync_http_stream.sln to sync_http_stream-2005.sln

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add transfer_response_body 传输条件
add completion_condition.hpp and move transfer_response_body into it
comment style.

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improve file.hpp

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improve multi_download.hpp

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