When HTTP server is unavailable,HttpCloseConnection will enter infinite loop to wait for TCP4->close Event return, So we need to decide the Http Instance state whether in the appropriate state before close it. Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Zhang Lubo <lubo.zhang@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com> Reviewed-by: Ye Ting <ting.ye@intel.com> Reviewed-by: Wu Jiaxin <jiaxin.wu@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@18400 6f19259b-4bc3-4df7-8a09-765794883524