improve options

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...
add comments

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...
code to utf8
add sync open implement
add keep-alive flag

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add request function

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add parsers.hpp

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update vc2005 project files
parser http header

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change open implement
improve open implement

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improve parser http header

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fixed redirection

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fixed max rederects control

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replace HTTP_ENABLE_OPENSSL to AVHTTP_ENABLE_OPENSSL

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improve open function

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improve is_open function

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add persers.hpp to vc2012 project file

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