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Java Network Q&A
Java Network Q&A » connection » proxy 

1. HTTP proxy connection sharing

I am attempting to implement an HTTP tunnel using similar techniques to those employed by web browsers to simulate a full-duplex connection, in Java using the Netty framework. I wish to ...

2. Read Java Internet Connections settings - jdk1.4

Is there a way of getting internet connection settings (proxy information) being used by java to connect to the internet? With Java 1.5 you can use the ProxySelector introduced then, ...

3. Launch options to force Java socket connections to localhost?

I'm trying to find a way to force any connection attempts a Jar makes to an external IP through my proxy server, which is running on localhost(Also a Java application). Once the ...

4. How to use URLConnection through a SOCKS proxy?

How can I set the SOCKS proxy for a URLConnection given by (new URL(url)).openConnection()? Different proxies are needed on a per-connection basis, so please don't suggest setting system properties.

5. Java 1.4.2 - Single http proxy connection

I need to create a single http proxy connection and i don't want to use java common environment variables such as http.proxyHost and http.proxyPort (should i care about modifying them?). There is ...

6. Java proxy connection

Im creating several proxy sockets and binding them to another server. Can i create more than 1 instance of the proxy socket? For example having 4 Sockets using the same proxy? ...

7. how to test proxy internet connection using java?

i have some code to test if the proxy server and port is working ,some of the code like this:

System.getProperties().put("proxySet", "true");
System.getProperties().put("https.proxyHost", "localhost");
System.getProperties().put("https.proxyPort", "1234");
System.getProperties().put("http.proxyHost", "localhost");
System.getProperties().put("http.proxyPort", "1234");
HttpURLConnection conn = (HttpURLConnection) new URL("").openConnection();
it seems ...

8. socket connection not properly trying each proxy returned from

Experimentally, cycles through the list of proxies returned by until if finds one that works. However, once encounters a broken proxy it is unable to recover. Is this ...

9. Java proxy issues - Connection Timed Out

I'm writing a web scraper in Java but I'm behind a proxy server and it's making things very difficult. This is the connection code:

public void scrape(String url, String filename) throws Exception {

10. URLConnection(Proxy proxy) ignoring the set proxy

I'm trying to test a SOCKS proxy that's under load from multiple machines. The outline of my code is something along the lines of

  1. Connect directly to the server with one client, ...

11. How to use URLConnection Timeout

I am trying to sort through a list of SOCKS proxies, and figure out which ones have a connect and read time of less than 1000ms, here is my code

for(Proxy p ...

12. Direct connection to Internet without Proxy

Is it possible to make a Direct connection to the Internet without using a Proxy. Consider a case that my Organization has a Proxy and I use the DIRECT option given in ...

13. Why does the ProxySelector is null in HttpUrlConnection.plainConnect()?

I have to call a WS that requires custom client authentication. This authentication is done by a program running on the client and listening on So I add a ...

14. How to check if proxy is working in Java?

I searched google, this site and JavaRanch and I can not find an answer. My program needs to obtain proxies from a selected file(I got that done using java gui FileChooser class ...

15. How to get URL connection using proxy in java?

I am trying to create url connection using a proxy at run time. My code is below:

Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress("", 80));
HttpURLConnection connection =
    (HttpURLConnection)new URL("").openConnection(proxy);
But ...

16. Proxy With Java URLConnection class

I am very new with Java. I am using following code for the calling REST API, its working fine in simple environment but when I used with proxy environment Its throwing ...

17. Socket connection from behind the Proxy Server

Hello Everyone I've one application which opens a socket to connect and retrieve data from internet. Now my machine has gone behind a proxy server and I'm not able to connect to internet from my same old aplication. Can anyone pls. help me as how to solve this problem.. How can I provide the username and password to connect to the ...

19. making a socket connection via proxy

20. Proxy server connection

21. Avoid proxy server setings in httpurlconnection

Hi All, Some technical help required: While establishing connection using urlconnection or httpurlconnection, I want to bypass the proxy server for sure (irrespective of whether proxy server setting are there or not) is there any way of doing it??? I know i can remove the setting and then procced, but dont want to do that as another piece of code ...

22. Reading proxy settings and applying in URL connection

Just want to save some time dealing with search engines. For Windows platform primary, but for some others can be good too. I want to apply proxy settings to URL connection based on proxy settings set for IE/FF or other browser. I guess I can use package java.util.prefs for reading Windows Registry for proxy setting values. Then I can use System.getProperties().put( ...

23. Socket connection on VPN plus Proxy server

Hi to all! At my work place we have a proxy server and on each machine we have a proxy client. With everything enabled, I can send emails and connect to sockets on Internet without any problems. However, we are now switching to opening the sockets on a VPN; I have found that for this to properly work, I must disable ...

24. Socket connection through a proxy

I am trying to open a socket to an address out of the company network and thus firewalled. I tried the following but it doesnt seem to do anything. I see the proxy object gets created, but the when the socket tries to connect, it just seems to get blocked. Proxy proxy = new Proxy(Proxy.Type.SOCKS, new InetSocketAddress("", 80)); Socket socket = ...

25. Invoking URL through Proxy Connection

Hi, I am trying to invoke url from java. I used the following code to do this: URL url = null; HttpURLConnection connection = null; InputStream inStream = null; Authenticator.setDefault(new UserAuthenticate("itlinfosys\\chaya_somanchi", "mypwd")); System.out.println("After Authenticator"); String proxy_addr = ""; int proxy_port = 80; addr = new InetSocketAddress(proxy_addr,proxy_port); System.out.println("After SocketAddress "+addr.toString()); System.out.println("Proxy Type: "+Proxy.Type.HTTP.toString()); proxy = new Proxy(Proxy.Type.HTTP, addr); connection = (HttpURLConnection)url.openConnection(proxy); connection.connect(); ...

26. problem in connection when used proxy

27. query on proxy connection in Java

28. HttpURLConnection and Proxies

29. i have a connection timeout problem with proxy

Ha, ha, nice try... If you want people to try out random code posted over the Web, at least make it easy and appealling to them: - please provide an [SSCCE|]. Don't expect us to fill in the blanks to have this compile and run. - Please provide a description of the desired vs undesired behavior (not so clear from your ...

30. Java URLConnection via proxy

Hi all, I need help! i have web server in our network, but i need get pages ONLY via proxy, not directly! I try next(and others): class SimpleAuthenticator extends Authenticator { private String username, password; public SimpleAuthenticator(String username, String password) { this.username = username; this.password = password; } protected PasswordAuthentication getPasswordAuthentication() { return new PasswordAuthentication( username, password.toCharArray()); } } Authenticator.setDefault(new SimpleAuthenticator( ...

31. HttpUrlConnection with Proxy

Hi, I am getting the following error, when i connect to a URL using proxy: Exception in thread "main" Received fatal alert: handshake_failure at at at at at at at at at at at The URL does use a digital certificate , but i do not have it yet, ...

32. Configure proxy and dns server for a single URLConnection

Mainly because it's in the spec. I did not figure out exactly why it is necessary to use different dns servers. Let me give you a quick glimpse what the application should do: The application checks if a URL is still available and returns an xml file with a return code (401 for example), connection time, an extract of thesource code ...

33. query on PROXY Connection in Java

The same mechanism can be used to specify that a particular URL has to be reached directly, because it's on the intranet for example. That's where the DIRECT type comes into play. But, you don't need to create a proxy instance with the DIRECT type, all you have to do is use the NO_PROXY static member:  | Contact Us | Privacy Policy
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