How do I make HttpURLConnection use a proxy

Question

If I do this     conn   new URL urlString  openConnection    System out println  Proxy      conn usingProxy       it prints  Proxy  false   The problem is  I am behind a proxy  Where does the JVM get its proxy information from on Windows  How do I set this up  All my other apps seem perfectly happy with my proxy

User · Answer

This is fairly easy to answer from the internet  Set system properties http proxyHost and http proxyPort  You can do this with System setProperty    or from the command line with the -D syntax

User · Answer

The approved answer will work     if you know your proxy host and port      But in case you are looking for the proxy host and port the steps below should help     if auto configured proxy is given  then      1  open IE or any browser       2  get the url address from your browser through IE- Tools- internet   option- connections- LAN Settings-  get address and give in url eg  as   http   autocache abc com  and enter  a file will be downloaded with    pac format  save to desktop      3  open  pac file in textpad  identify PROXY       In your editor  it will come something like       return  PROXY web-proxy ind abc com 8080  PROXY   proxy sgp abc com 8080     kudos to bekur from maven in 5 min not working  Once you have the host and port just pop in into this and your good to go  Proxy proxy   new Proxy Proxy Type HTTP  new InetSocketAddress  web-proxy ind abc com   8080            URLConnection connection   new URL url  openConnection proxy

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Since java 1 5 you can also pass a java net Proxy instance to the openConnection proxy  method     Proxy instance  proxy ip   10 0 0 1 with port 8080 Proxy proxy   new Proxy Proxy Type HTTP  new InetSocketAddress  10 0 0 1   8080    conn   new URL urlString  openConnection proxy     If your proxy requires authentication it will give you response 407   In this case you ll need the following code       Authenticator authenticator   new Authenticator              public PasswordAuthentication getPasswordAuthentication                 return  new PasswordAuthentication  user                        password  toCharArray                           Authenticator setDefault authenticator

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For Java 1 8 and higher you must set -Djdk http auth tunneling disabledSchemes  to make proxies with Basic Authorization working with https

User · Answer

Set following before you openConnection   System setProperty  http proxyHost    host    System setProperty  http proxyPort    port number      If proxy requires authentication   System setProperty  http proxyUser    user    System setProperty  http proxyPassword    password

User · Answer

Proxies are supported through two system properties  http proxyHost and http proxyPort  They must be set to the proxy server and port respectively  The following basic example illustrates it   String url    http   www google com           proxy    proxy mydomain com          port    8080   URL server   new URL url   Properties systemProperties   System getProperties    systemProperties setProperty  http proxyHost  proxy   systemProperties setProperty  http proxyPort  port   HttpURLConnection connection    HttpURLConnection server openConnection    connection connect    InputStream in   connection getInputStream    readResponse in

User · Answer

You can also set  -Djava net useSystemProxies true   On Windows and Linux this will use the system settings so you don t need to repeat yourself  DRY   http   docs oracle com javase 7 docs api java net doc-files net-properties html Proxies

[java] How do I make HttpURLConnection use a proxy?

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