Android studio reports Could not GET 'https://dl.google.com/' 400 bad request

Error message:

Could not GET 'https://dl.google.com/dl/android/maven2/com/android/tools/bui bad request
或
request 400
或
bad request

Problem:
android studio gradle.properties systemProp.http.proxyHost misconfigured (proxy)

Reason:
wrong proxy address (generally unreachable)

Solution:
delete

C:\Users\Admin\.gradle下面gradle.properties的：
systemProp.http.proxyHost=mirrors.neusoft.edu.cn 及其他代理端口和地址