Wcf – How to set an HTTP Proxy (WebProxy) on a WCF client-side Service proxy


How can I set the HTTP proxy programmatically, on a WCF client, without using the default proxy?

Proxies, proxies, proxies.

According to the WCF model of development, I generate client-side "proxy"
classes by running svcutil.exe on the WSDL for the service. (This also
produces a client-side config file).

In my code I new-up an instance of that class and I can connect to the
service. Very nice.

var svcProxy = new MyWebService();

We call this thing a proxy class, but there is another proxy – the http proxy. This
service is using wsHttpBinding basicHttpBinding, so it is going over
http. Now, suppose I want to connect the client to the web service over
a http proxy (modeled by a System.Net.WebProxy in the .NET BCL). I know
from my extensive, delightful experience reading .NET and WCF documentation, that
the WCF runtime, if not instructed otherwise, will use the default
system proxy when communicating over http/https.

I can set that from the command line in
WinXP / 2003 with ProxyCfg.exe as described here, and in later
versions of Windows with netsh.exe as described here.

I can also specify the default web proxy for use within the application
by setting the System.Net.WebRequest.DefaultWebProxy property.

But suppose I want to connect over a proxy that is different than the
system-wide proxy? For instance maybe there is no system-wide proxy but
I need to use one for the web service in particular. Or maybe there is
a system-wide proxy but I need to use a different one, for the web
service. And in fact maybe there are multiple web service clients, and
each one should get a different proxy.

How can the proxy be set per-binding?

In the ASMX model, I could do this:

var svcProxy = new MyWebService();
svcProxy.Proxy = new System.Net.WebProxy("http://proxyserver:1234", true);

But this is not possible with WCF; the WCF-generated client-side proxy
classes do not expose a Proxy property. How do I set the http proxy, per client-side proxy, and how do I set authentication on the http proxy as well?


Best Solution

It makes sense that there is no Proxy property on the WCF proxy, because not all WCF proxies use HTTP for communication. After further review, I found that it is possible to set the proxy in WCF programmatically, if the WCF proxy uses an HTTP binding. I am documenting it here in case someone else needs it. To set the HTTP Proxy in code for a WCF client, do this:

// instantiate a proxy for the service
var svc= new ServiceClient();
// get the HTTP binding
var b = svc.Endpoint.Binding as System.ServiceModel.BasicHttpBinding;
b.ProxyAddress = new Uri("");
b.BypassProxyOnLocal = false;
b.UseDefaultWebProxy = false;

And to set the endpoint address - where to reach the server - in code, you would do something like this:

var e = svc.Endpoint;
e.Address = new System.ServiceModel.EndpointAddress(