* Add a config parameter to switch off http server (fix #2057)
Signed-off-by: NYhz <yinghao.zou@zilliz.com>

* modify web enable config name
Signed-off-by: NYhz <yinghao.zou@zilliz.com>

* fix cmake bug & output exanption msg
Signed-off-by: NYhz <yinghao.zou@zilliz.com>

* rename web enbale config as web_enable
Signed-off-by: NYhz <yinghao.zou@zilliz.com>

* optimize code
Signed-off-by: NYhz <yinghao.zou@zilliz.com>

* log out errno
Signed-off-by: Nyhz <413554850@qq.com>