ERROR: HTTPSConnectionPool(host='center.conan.io', port=443):

最近在使用conan-center下载三方库，之前是好好，突然不行了

更新conan-center对应的url,最新的为：

conan-center: https://center.conan.io [Verify SSL: True]
之前默认为
https://conan.bintray.com/

更新conan版本

pip install --upgrade conan

第一次运行会自动删除证书相关的东西，如果没有，去相关目录手动删除，至此问题解决。

conan --version

WARN: Migration: Updating settings.yml
WARN: ****************************************
WARN: settings.yml is locally modified, can't be updated
WARN: The new settings.yml has been stored in: /home/xuke/.conan/settings.yml.new
WARN: ****************************************
Removing the 'cacert.pem' file...

搜索成功

conan search boost -r=conan-center

Existing package recipes:

boost/1.69.0
boost/1.70.0
boost/1.71.0
boost/1.72.0
boost/1.73.0
boost/1.74.0
boost/1.75.0
boost/1.76.0
boost/1.77.0
boost/1.78.0