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+translating by lujun9972
+How to use curl command with proxy username/password on Linux/ Unix
+======
+
+My sysadmin provided me the following proxy details:
+```
+IP: 202.54.1.1
+Port: 3128
+Username: foo
+Password: bar
+```
+
+The settings worked perfectly with Google Chrome and Firefox browser. How do I use it with the curl command? How do I tell the curl command to use my proxy settings from Google Chrome browser?
+
+
+Many Linux and Unix command line tools such as curl command, wget command, lynx command, and others; use the environment variable called http_proxy, https_proxy, ftp_proxy to find the proxy details. It allows you to connect text based session and applications via the proxy server with or without a userame/password. T **his page shows how to perform HTTP/HTTPS requests with cURL cli using PROXY server.**
+
+## Unix and Linux curl command with proxy syntax
+
+
+The syntax is:
+```
+## Set the proxy address of your uni/company/vpn network ##
+export http_proxy=http://your-ip-address:port/
+
+## http_proxy with username and password
+export http_proxy=http://user:password@your-proxy-ip-address:port/
+
+## HTTPS version ##
+export https_proxy=https://your-ip-address:port/
+export https_proxy=https://user:password@your-proxy-ip-address:port/
+```
+
+
+Another option is to pass the -x option to the curl command. To use the specified proxy:
+```
+curl -x <[protocol://][user:password@]proxyhost[:port]> url
+--proxy <[protocol://][user:password@]proxyhost[:port]> url
+--proxy http://user:password@Your-Ip-Here:Port url
+-x http://user:password@Your-Ip-Here:Port url
+```
+
+## Linux use curl command with proxy
+
+First set the http_proxy:
+```
+## proxy server, 202.54.1.1, port: 3128, user: foo, password: bar ##
+export http_proxy=http://foo:bar@202.54.1.1:3128/
+export https_proxy=$http_proxy
+## Use the curl command ##
+curl -I https://www.cyberciti.biz
+curl -v -I https://www.cyberciti.biz
+```
+Sample outputs:
+
+```
+* Rebuilt URL to: www.cyberciti.biz/
+* Trying 202.54.1.1...
+* Connected to 1202.54.1.1 (202.54.1.1) port 3128 (#0)
+* Proxy auth using Basic with user 'foo'
+> HEAD HTTP://www.cyberciti.biz/ HTTP/1.1
+> Host: www.cyberciti.biz
+> Proxy-Authorization: Basic x9VuUml2xm0vdg93MtIz
+> User-Agent: curl/7.43.0
+> Accept: */*
+> Proxy-Connection: Keep-Alive
+>
+< HTTP/1.1 200 OK
+HTTP/1.1 200 OK
+< Server: nginx
+Server: nginx
+< Date: Sun, 17 Jan 2016 11:49:21 GMT
+Date: Sun, 17 Jan 2016 11:49:21 GMT
+< Content-Type: text/html; charset=UTF-8
+Content-Type: text/html; charset=UTF-8
+< Vary: Accept-Encoding
+Vary: Accept-Encoding
+< X-Whom: Dyno-l1-com-cyber
+X-Whom: Dyno-l1-com-cyber
+< Vary: Cookie
+Vary: Cookie
+< Link: ; rel="https://api.w.org/"
+Link: ; rel="https://api.w.org/"
+< X-Frame-Options: SAMEORIGIN
+X-Frame-Options: SAMEORIGIN
+< X-Content-Type-Options: nosniff
+X-Content-Type-Options: nosniff
+< X-XSS-Protection: 1; mode=block
+X-XSS-Protection: 1; mode=block
+< X-Cache: MISS from server1
+X-Cache: MISS from server1
+< X-Cache-Lookup: MISS from server1:3128
+X-Cache-Lookup: MISS from server1:3128
+< Connection: keep-alive
+Connection: keep-alive
+
+<
+* Connection #0 to host 10.12.249.194 left intact
+```
+
+
+In this example, I'm downloading a pdf file:
+```
+$ export http_proxy="vivek:myPasswordHere@10.12.249.194:3128/"
+$ curl -v -O http://dl.cyberciti.biz/pdfdownloads/b8bf71be9da19d3feeee27a0a6960cb3/569b7f08/cms/631.pdf
+```
+OR use the -x option:
+```
+curl -x 'http://vivek:myPasswordHere@10.12.249.194:3128' -v -O https://dl.cyberciti.biz/pdfdownloads/b8bf71be9da19d3feeee27a0a6960cb3/569b7f08/cms/631.pdf
+```
+Sample outputs:
+[![Fig.01: curl in action \(click to enlarge\)][1]][2]
+
+## How to use the specified proxy server with curl on Unix
+
+```
+$ curl -x http://prox_server_vpn:3128/ -I https://www.cyberciti.biz/faq/howto-nginx-customizing-404-403-error-page/
+```
+
+## How to use socks protocol?
+
+The syntax is same:
+```
+curl -x socks5://[user:password@]proxyhost[:port]/ url
+curl --socks5 192.168.1.254:3099 https://www.cyberciti.biz/
+```
+
+## How do I configure and setup curl to permanently use a proxy connection?
+
+Update/edit your ~/.curlrc file using a text editor such as vim:
+`$ vi ~/.curlrc`
+Append the following:
+```
+proxy = server1.cyberciti.biz:3128
+proxy-user = "foo:bar"
+```
+
+Save and close the file. Another option is create a bash shell alias in your ~/.bashrc file:
+```
+## alias for curl command
+## set proxy-server and port, the syntax is
+## alias curl="curl -x {your_proxy_host}:{proxy_port}"
+alias curl = "curl -x server1.cyberciti.biz:3128"
+```
+
+Remember, the proxy string can be specified with a protocol:// prefix to specify alternative proxy protocols. Use socks4://, socks4a://, socks5:// or socks5h:// to request the specific SOCKS version to be used. No protocol specified, http:// and all others will be treated as HTTP proxies. If the port number is not specified in the proxy string, it is assumed to be 1080. The -x option overrides existing environment variables that set the proxy to use. If there's an environment variable setting a proxy, you can set proxy to "" to override it. See curl command man page [here for more info][3].
+
+
+--------------------------------------------------------------------------------
+
+via: https://www.cyberciti.biz/faq/linux-unix-curl-command-with-proxy-username-password-http-options/
+
+作者:[Vivek Gite][a]
+译者:[lujun9972](https://github.com/lujun9972)
+校对:[校对者ID](https://github.com/校对者ID)
+
+本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译,[Linux中国](https://linux.cn/) 荣誉推出
+
+[a]:https://www.cyberciti.biz
+[1]:https://www.cyberciti.biz/media/new/faq/2016/01/curl-download-output-300x141.jpg
+[2]:https://www.cyberciti.biz//www.cyberciti.biz/media/new/faq/2016/01/curl-download-output.jpg
+[3]:https://curl.haxx.se/docs/manpage.html