proxy in linux

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global proxy

in file /etc/profile set

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export proxy="http://user:pwd1@192.168.3.1:8848"
export http_proxy=$proxy
export https_proxy=$proxy
export ftp_proxy=$proxy
export no_proxy="localhost, 127.0.0.1, ::1"

unset command

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unset http_proxy
unset https_proxy
unset ftp_proxy
unset no_proxy

load variables
source /etc/profile

yum proxy

in file /etc/yum.conf set

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proxy=http://192.168.3.1:8848
proxy_username=user
proxy_password=pwd

npm proxy

set command

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npm config set proxy http://user:pwd@192.168.3.1:8848
npm confit set https-proxy http://user:pwd@192.168.3.1:8848

unset command

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npm config delete proxy
npm config delete https-proxy

npm setting
https://segmentfault.com/a/1190000002589144

maven proxy

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<proxy>
    <id>optional</id>
    <active>true</active>
    <protocol>http</protocol>
    <username>user</username>
    <password>pwd</password>
    <host>192.168.3.1</host>
    <port>8080</port>
    <nonProxyHosts>localhost|127.0.0.1</nonProxyHosts>
  </proxy>
</proxies>

https://www.cnblogs.com/EasonJim/p/9826681.html
https://blog.csdn.net/yanzi1225627/article/details/80247758