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Passing Custom HTTP Cookie Key/Value Pairs via JDBC Driver

HIVE-18447 introduced an option for clients to provide custom HTTP cookies that can be sent to the underlying server. Some authentication mechanisms like Single Sign On, need the ability to pass a cookie to some intermediate authentication service like Knox via the JDBC driver. 

JDBC connection URL: 

jdbc:hive2://<host>:<port>/<db>;transportMode=http;httpPath=<http_endpoint>;http.cookie.<name1>=<value1>;http.cookie.<name2>=<value2>

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When the above URL is specified, Beeline will call underlying requests to add HTTP cookie in the request header, and will set it to <name1>=<value1> and <name2>=<value2>. 

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