Flask安裝: A true SSLContext object is not available

如果安裝Flask出現這樣的報錯:InsecurePlatformWarning: A true SSLContext object is not available. This prevents urllib3 from configuring SSL
appropriately and may cause certain SSL connections to fail. For more information, see https://urllib3.readthedocs.org/en/latest/security.html#insecureplatformwarning.

再如果你的python版本是2.7.9之前的版本，那麼需要升級python版本，或pip install -U requests[security]，因為2.7.9之前的python提供的SSL環境不夠安全，進行了改進。