How can I set an HTTP Proxy (WebProxy) on a WCF client-side Service proxy?

Question

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

Answer 1

I found a solution for someone who might use .NET Core 2.x

Which initially cause an issue when trying to set proxy by using

System.ServiceModel.BasicHttpBinding;

as answered by Cheeso.

You have to update WCF to the latest (v.4.7.0).

Go to NuGet Package Manager -> Update all related Project URL of WCF.

There must be:

• System.ServiceModel.Security
• System.ServiceModel.NetTcp
• System.ServiceModel.Http

Answer 2

The proxy settings are part of the binding configuration. For example, look at the ProxyAddress property of the BasicHTTPBinding and WSHttpBinding classes/configuration elements.

Looks like you're leaving your endpoint configuration in the app.config file, in which case you should be able to set the address there.

Answer 3

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("http://127.0.0.1:8888");
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(
    "http://remoteserver:5555/WcfXmlElement");

Answer 4

I have had a similar problem, but I also needed to use a username and password for the proxy that differ from the username and password used to access the service.

I tried building it up through a UriBuilder, which would output the proxy address as "http://username:password@myproxyserver/". Unfortunately, the particular proxy I was using didn't work with this technique.

What I found after extensive Googling, is that you can change the proxy through WebRequest.DefaultProxy (static property).

For example:

WebProxy proxy = new WebProxy("http://myproxyserver",true);
proxy.Credentials = new NetworkCredential("username", "password");
WebRequest.DefaultWebProxy = proxy;

Answer 5

You could also try this :

Programmatically get whatever binding you are using,and then set the proxy on it directly e.g.

var binding = new WSDualHttpBinding("WSDualHttpBinding_IMainService");
binding.ProxyAddress = new Uri("http://192.168.5.1:3128");

where "WSDualHttpBinding_IMainService" is the name of your binding from your config file. Also you have to set UseDefaultWebProxy=false; otherwise your proxy will be ignored.