Martin,
With a transparent proxy as you are using, you need to proxy all the
links. The issue is that you are injecting a /myproxy servlet path into
the "transparent" proxy, so you are transforming request for
http://127.0.0.1:7070/myproxy/ to requests for http://htmlhelp.com/.
Plus you are not translating any of the image and link requests that will
be going to /* rather than /myproxy/*
If you registered the transparent proxy servlet at /* it would probably
work fine.
If you really wanted to, you could rewrite the host header, but then all
images and links would bypass your proxy and you would lose capture of the
client.
cheers
On Mon, 4 Nov 2019 at 20:00, Martin Brentnall <martin.brentn...@gmail.com>
wrote:
> Hi everyone,
>
> I'm trying to use Jetty transparent proxy to forward to a public web
> server, but currently unable to get a simple example working as I would
> expect. This is my code:
>
>
> --- CODE BEGIN ---
>
>
> package test.myproxy;
>
> import org.eclipse.jetty.proxy.ProxyServlet;
> import org.eclipse.jetty.server.Server;
> import org.eclipse.jetty.servlet.ServletContextHandler;
> import org.eclipse.jetty.servlet.ServletHolder;
>
> public class MyHttpProxy {
> public static void main(String[] args) {
> try {
> Server mServer = new Server(7070);
> ServletContextHandler mContext = new ServletContextHandler(mServer,
> "/");
> ServletHolder mHolder =
> mContext.addServlet(ProxyServlet.Transparent.class, "/myproxy/*");
> mHolder.setInitOrder(1);
> mHolder.setInitParameter("proxyTo", "http://www.htmlhelp.com";);
> mHolder.setInitParameter("prefix", "/myproxy");
> mServer.start();
> mServer.join();
> } catch (Exception e) {
> e.printStackTrace();
> }
> }
> }
>
>
> --- CODE END ---
>
>
> When I run this, I can access the website htmlhelp.com in Chrome via the
> URL http://127.0.0.1:7070/myproxy/ as expected. However, the links and
> images on the page do not work, since they all refer to "127.0.0.1:7070/"
> (rather than "127.0.0.1:7070/myproxy/"). So for example, "
> http://127.0.0.1:7070/about/";, "http://127.0.0.1:7070/icon/wdglogo.gif";,
> etc. which of course are not recognised URL's on the Jetty server.
>
> On further investigation, I learned that the HTTP request includes
> headers, one of which is "host". It seems that a website uses this header
> to construct the link and image URL's. Indeed, if I change the "host"
> header in the debugger to "htmlhelp.com" immediately before the request
> is sent, then everything loads as expected.
>
> Now as I understand, the "host" header is an "end to end" header, meaning
> that the proxy should NOT modify it, so it seems that isn't an option.
> Besides, doing this would cause image loading and links to bypass the proxy
> anyway.
>
> Is it possible to accomplish what I'm trying to do? Apologies for the
> newbie question; this HTTP and web stuff is still quite new to me.
>
> In case it makes any difference, I'm using Jetty 9.0.7.
>
> --
> With Kind Regards,
> Martin Brentnall
>
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--
Greg Wilkins <gr...@webtide.com> CTO http://webtide.com
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![http://127.0.0.1:7070/icon/wdglogo.gif"](http://127.0.0.1:7070/icon/wdglogo.gif"){kind=link}