The realization principle of apache.common.httpclient

Today leader taught me how to use httpclient. In the past, http requests were sent by clicking on the page. I didn"t expect to be able to simulate the request with httpclient.
but how does this work?

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Mar.06,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b31c65-2b612.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31c65-2b612.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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