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.
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);
new PasswordAuthentication("domainName\\user", "password".toCharArray());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. EDIT: per comment, set https.proxyPort and https.proxyHost for HTTPS.
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);
commons-httpclient? As Java supports proxying and authentication (as you mentioned here stackoverflow.com/questions/1626549/…), for simple cases (like retrieve one file from public HTTP server) there is no reason to use Apache library. What is your recommendation?
systemProperties is not used by the connection!
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
System.setProperty for the https.proxyHost and https.proxyPort for some reason weren't cutting the mustard.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");
For Java 1.8 and higher you must set -Djdk.http.auth.tunneling.disabledSchemes= to make proxies with Basic Authorization working with https.
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);
