Your copy of depot_tools is configured to fetch from an obsolete URL:

https://webrtc.bj2.agoralab.co/webrtc-mirror/depot_tools.git

OK to update it to https://chromium.googlesource.com/chromium/tools/depot_tools.git ? [Y/n] n

curl: (7) Failed to connect to 2001::d238:33c1: 网络不可达

curl: (7) Failed to connect to 2001::d238:33c1: 网络不可达

/home/httpd/depot_tools/bootstrap_python3:行32: bootstrap-3.8.0.chromium.8_bin/python3/bin/python3: 没有那个文件或目录

Warning: gclient doesn't yet support Python 3 and may not work correctly.