Using web proxy with Java 8 JAX-RS RESTEasy clients

Question

I can't seem to get JAX-RS clients to use a web proxy on Java 8. I'm using RESTEasy 3.0.10.Final, and running from inside Eclipse 4.4.2 on Windows 7 Professional 64-bit.

I set up a FreeProxy server on localhost running at 192.168.1.123:3128. I turn logs on and telnet to 192.168.1.123 3128 and issue a manual GET. The request shows up in the logs.

I then fire up my Java application, setting http.proxyHost=192.168.1.123 and http.proxyPort=3128 in the system properties. (I've even tried it using -D when starting the JVM.) (Note that I wouldn't expect the localhost problem to come into play, as I'm connecting to an actual IP address, not to localhost.)

I create a JAX-RS client using ClientBuilder.newBuilder().build() and perform a GET to a resource. Nothing shows up in the FreeProxy logs.

What do I have to do in order to get JAX-RS clients to use a proxy?

For future reference, see also http://stackoverflow.com/q/5249734/421049 . — Garret Wilson, Mar 14 '15 at 20:09

lefloh · Accepted Answer · 2015-03-16T18:27:46.347

14

The ResteasyClientBuilder provides a method to define the defaultProxy:

ResteasyClient client = new ResteasyClientBuilder().defaultProxy("localhost", 8080, "http").build();

edited Mar 16 '15 at 18:27

answered Mar 14 '15 at 15:08

lefloh

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I'm just now reading http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html#d5e475 and trying to use the `SystemDefaultRoutePlanner` to use the standard JRE proxy selector. But how do I pull in the `SystemDefaultRoutePlanner` and `HttpClients` classes? – Garret Wilson Mar 14 '15 at 16:10
lefloh, the code you indicated works! (I think RESTEasy brought in the dependency for me.) I'm now getting connection logs in my local proxy server logs. It's a shame that I have to create a separate configuration when Java already has a way to configure proxies. Can you let me know how to pull in the dependencies to use `SystemDefaultRoutePlanner` as indicated in my earlier comment? – Garret Wilson Mar 14 '15 at 17:50
...and how do I set up a proxy to be used both for HTTP and HTTPS? It looks like the technique you showed only installs a proxy for one or the other. – Garret Wilson Mar 14 '15 at 18:27
I updated my answer. First of all: Resteasy provides a method to set the default proxy. I didn't see that before. But as you found out only for one scheme. I think this could work with the `SystemDefaultRoutePlanner` you mentioned. I added an example which is compiling with the dependency written above. I didn't test that. – lefloh Mar 14 '15 at 21:25
But lefloh I still don't understand what I need to include in Maven to give me the `SystemDefaultRoutePlanner` et. al. The `httpclient` package you mentioned isn't doing it. In addition, note that your example differs from the one at the Apache documentation I linked above --- the one that is linked from the actual RESTEasy documentation. In any case, I need to know the dependency to get `HttpClients` and `SystemDefaultRoutePlanner`. – Garret Wilson Mar 16 '15 at 16:20
From http://hc.apache.org/httpcomponents-client-ga/httpclient/apidocs/org/apache/http/impl/conn/SystemDefaultRoutePlanner.html it appears that `SystemDefaultRoutePlanner` is only available since 4.3. But I'm showing that RESTEasy 3.0.10.Final is using httpclient 4.2.6. So lefloh your answer no longer works. – Garret Wilson Mar 16 '15 at 16:27
You're right, I had a newer dependency in my project. I rewrote the example to something similar fitting for the older version but in this version HTTPClient are not using `http.proxyHost`. – lefloh Mar 16 '15 at 18:08
Thanks for updating your answer, lefloh. I'll check into it. But does it work correctly if Java has `java.net.useSystemProxies` in effect? See http://stackoverflow.com/q/29083945/421049 . – Garret Wilson Mar 16 '15 at 18:12
Furthermore I don't see how your new answer improves on the old answer, if it's still not using `http.proxyHost`. How is this any different functionally from your first answer? I'm starting to get all confused. – Garret Wilson Mar 16 '15 at 18:16
OK, I reduced the answer to the part which answers your original question. To your comment about http/https: Seems like the Resteasy Client API doesn't provide a way to do this. It may be possible to configure the Apache HttpClient directly but I didn't figure out how. – lefloh Mar 16 '15 at 18:27
Huge thanks for your answer! Resteasy is so unstable with proxy settings, what works for 2* doesn't work for 3* or 4*. Wasted whole day, until found this thread. For wildfly with 3.5 your option works fine! – Oleg Gritsak Jul 18 '19 at 10:19

score 6 · Answer 2 · edited Dec 20 '19 at 05:28

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It seems to be possible to make RESTeasy use Java's proxy properties (e.g. -Dhttp.proxyHost) by using a different engine instead of HttpClient. java.net.HttpURLConnection supports proxy properties out of the box:

ResteasyClient client = new ResteasyClientBuilder().httpEngine(new URLConnectionEngine()).build();

edited Dec 20 '19 at 05:28

theglauber

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answered Mar 25 '19 at 09:56

Nikolai Prokoschenko

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Woarked for me! – theglauber Dec 20 '19 at 05:28
Is there a system property that I could set to make RESTEasy use that http engine? I'm using a third party library where I can't change the RestEasyClientBuilder initialization. – Tobias Liefke Mar 17 '21 at 07:10
@TobiasLiefke Not one I'm aware of, but I'm not really an expert on this. Which still might be possible and I'd be really interested in that as well! – Nikolai Prokoschenko Mar 17 '21 at 10:14

score 0 · Answer 3 · answered Oct 10 '21 at 18:33

For RESTEasy 4, here is what I've done for that:

ResteasyClient client = ((ResteasyClientBuilder) ClientBuilder.newBuilder())
    .defaultProxy(proxyHost, proxyPort)
    .build();

return client
    .target(ENDPOINT_URL)
    .proxy(EndpointResource.class);

Using web proxy with Java 8 JAX-RS RESTEasy clients

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