How to connect properly using HTTP proxy in java? I can do it with sockProxyHost, but not with http.proxyHost.
If i do with socks, it will wait out for the proxy to connect and then it will create the web request, but if i do it with http it will just create the request and dont connect to the proxy.
System.setProperty("http.proxySet", "true");
System.setProperty("http.proxyHost", "validproxyip");
System.setProperty("http.proxyPort", "validproxyport");
is my code. but it wont connect to the proxy. Please help!
Check out the proxy documentation at Oracle
Either you have a typo, or you are using https and not http, or you access a "No-proxy" host. If you want to be sure, use the ProxySelector.
Try set it in the vm args
java -DproxyHost=proxy.mydomain.com -DproxyPort=3128 your.Main
Related
I wrote Java code to login to Salesforce and ran this code on a firewalled server. For this, I have to specify the proxy url and proxy port before connecting to Salesforce due to the firewall. However, I'm getting an unknownhostexception error for the proxy url. If I try to login via curl with the proxy settings, I am able to connect. How come there is a problem connecting using Java then? Any help is appreciated.
Apparently the issue was caused by JVM configs. We have to configure JVM to use the proxy settings as follows:
System.setProperty("http.proxyHost", crmProxyURL);
System.setProperty("http.proxyPort", crmProxyPort);
Depending on your HTTP library the System settings might not be enough or not needed. In the Salesforce context it is quite possible that one would try using the Jetty HTTP Client. In this case the System properties are ignored and proxy needs to be handled by the Jetty client:
ProxyConfiguration proxyConfig = httpClient.getProxyConfiguration();
HttpProxy proxy = new HttpProxy("proxyHost", proxyPort);
proxyConfig.getProxies().add(proxy);
The Apache HTTP Client, another popular choice, also uses its own little mechanism:
HttpHost proxy = new HttpHost("proxyHost", proxyPort, "https");
RequestConfig config = RequestConfig.custom().setProxy(proxy).build();
HttpGet request = new HttpGet(someURL);
request.setConfig(config);
Interesting here: one can specify to use http or https as the proxy protocol.
In general I found using one of the http client much easier that the JDK low level functions.
I'm trying to validate an SSL connection to an http server through a proxy server. In my case, I have 4 pieces of information which are all supplied by the user, and which I'd like to validate explicitly: target host, target port, proxy host, proxy port. I'd prefer to NOT make an actual HTTP request in order to do this validation, since that requires 2 more pieces of information: a request method, and a path (ie. "GET /"). I'd really like to be able to use the HttpClient library because it supports NTLM proxy auth.
I suppose what I want is to get the response of a CONNECT request sent to the proxy server, as all it requires are the 4 pieces of information I have (plus any proxy creds). However this seems to be an implicit request, the result of which is not available to the library client (unless it returns a 407 status code). Is there some way to trigger the CONNECT request explicitly?
You can use ProxyClient shipped with Apache HttpClient. It does precisely that.
I am trying to develop an app which will take ip address as a input and set it as a proxy in clients firefox as a proxy. The idea here is , I am trying to gain access to squid server through java? is there any possibility of doing so? Thanks in advance
You can configure your Java application to use Charles in code or as command line arguments to the java executable.
System.setProperty("http.proxyHost", "127.0.0.1");
System.setProperty("http.proxyPort", "8888");
And for HTTPS as well. Note that you may also want to configure Java to trust Charles’s root certificate in this case (see SSL Proxying).
System.setProperty("https.proxyHost", "127.0.0.1");
System.setProperty("https.proxyPort", "8888");
proxy settings for Firefox are stored in prefs.js file of user
%APPDATA%\Mozilla\Firefox\Profiles\7a3fd5zw.default\prefs.js
here 7a3fd5zw is a random string.
There are settings named "network.proxy.http" and "network.proxy.http_port".
May be, you can try to modify them.
I want to write a java(SE) program to connect to a proxy server, lets say 123.123.123.123:8080. How am I going to achieve that? What is the protocol between my machine and the proxy server? What is the Java framework's class could be in use?
since java 1.5,you can use java.net.Proxy class to create proxy.
Proxy proxy=new Proxy(Proxy.Type.HTTP, new InetSocketAddress("123.123.123.123", 8080);
URL url = new URL("http://www.example.com");
HttpURLConnection uc = (HttpURLConnection)url.openConnection(proxy);
uc.connect();
reference
The definitive reference for network proxy configuration in Java 5 is this Java Networking and Proxies page.
Yes proxy server is a web server...
Whenever u send a request through your browser to get some resource in the particular web server(say www.google.com),the request is send to the proxy server instead to sending the request directly to the google server..the proxy server process this request,send them to the gooogle server,receives the response and then send the response back to the browser.
Proxy server is basically used to corporate fields to restrict the accesss to specific websites,to keep a track of the internet used by a particular associate,Also it saves some commoonly used webpages in a cache file,so that when another request comes,then instead of connecting to the required server,it get the webpage fron the cache file..Hence it saves the time.Also it scans the incoming data from any server for malware before submitting it to the client(browser).To check if ur company is using proxy server,u can go to the internet explorer setting ->Connections ->LAN Settings
I have made a web service client importing a third party wsdl in eclipse.
But I got this exception:
javax.xml.ws.WebServiceException: Connection IO Exception. Check nested exception for details. (Unable to connect to 1X.XXX.X.XX:X0 - Connection timed out).
I hope this exception occurred for the proxy only.
There is a proxy server between me and that third party. I don't know how to do the proxy authentication and where in coding I need to this proxy authentication.
Is your end point on HTTPS? There different ways proxies support HTTPS - one ways is SSL bridging and the other is SSL Tunneling..
May be your client side libraries you used to connect may not support the one being used by the proxy...
You must explicitly set the proxy server in Java, the JRE does not retrieve it from the OS configuration. You can find the detailed explanation here. As per the link, a standard configuration may look like this:
System.setProperty("http.proxyHost", "myproxy.com");
System.setPropery("http.proxyPort", "8080");
Obviously, you can also define the system properties as VM arguments during startup.