bugfix: the previous patch for using ngx.ctx in set_by_lua* could result in memory leaks; now we ensure that the request cleanup handler is always registered when set_by_lua* is used.
bugfix: the previous patch for using ngx.ctx in set_by_lua* could result in memory leaks; now we ensure that the request cleanup handler is always registered when set_by_lua* is used.

yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx