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Using fiddler with Java and Eclipse

Posted by: admin December 28, 2021 Leave a comment

Questions:

I’m trying to hook up fiddler to a java unit test in Eclipse so I can see the soap request when our web service is being called…It works automatically in our .NET harness but is there some setting that needs to be applied for Java? Thanks

Answers:

I have not tried this, but …

Fiddler establishes itself as a proxy server, listening on localhost:8888

You can configure Java to use a proxy server with the http.proxyHost and http.proxyPort (see http://download.oracle.com/javase/6/docs/technotes/guides/net/proxies.html).

So, if you go into Eclipse and set the “VM” arguments to the following, it should route all traffic through Fiddler (which, of course, must be already running):

-Dhttp.proxyHost=localhost
-Dhttp.proxyPort=8888

This assumes that your application is using URLConnection. If it’s using Apache HttpClient or some other library, you may need to check the documentation for that library.

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I am usring Apache HttpClient(4.5.5), SWT 4, Fiddler 4, and the VM arguments method does not work for me. So I set the proxy settings in the code and it works.

HttpHost proxy = new HttpHost("localhost", 8888, "http");
DefaultProxyRoutePlanner routePlanner = new DefaultProxyRoutePlanner(proxy);
CloseableHttpClient httpclient = HttpClients.custom()
                .setRoutePlanner(routePlanner)
                .build();