MetadataExchangeClient using Web Proxy

Question

I am trying to connect to a URI pointing to a WSDL file which describes a WCF service by using the MetadataExchangeClient class.

var mexClient = new MetadataExchangeClient(uri, MetadataExchangeClientMode.HttpGet);
var metaDocs = mexClient.GetMetadata();

The problem is that I cannot access this uri directly and need to go through a HTTP proxy server. The proxy server URL can change at runtime so I cannot simply configure it through the app.config file.

Where can I specify the proxy server information in the MetadataExchangeClient class?

Anyone got an idea? WCF experts?

albertjan · Accepted Answer · 2012-07-25T10:09:26.750

3

You need to specify the proxy in the app.config like this:

<system.net>
  <defaultProxy enabled="true">
   <proxy bypassonlocal="true"
          proxyaddress="http://proxy.domain.org:8888/" />
  </defaultProxy>
</system.net>

edited Jul 25 '12 at 10:09

answered Jul 25 '12 at 09:51

albertjan

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Sorry, I forgot to mention that proxy data (url, credentials) is configured at runtime. So I cannot hardcode it in `app.config`. (I updated the question). – Wolfgang Ziegler Jul 25 '12 at 10:17
Could you include that code in question? Do you do it like [this](http://stackoverflow.com/questions/186800/is-it-possible-to-specify-proxy-credentials-in-your-web-config) – albertjan Jul 25 '12 at 10:21
In my application the user can configure a proxy at runtime. Based on that, I have to disable the default proxy and use the newly specified proxy settings. I have to pick up these new settings immediately. Restarting the application is not an option. – Wolfgang Ziegler Jul 25 '12 at 12:26
Do you update the system proxy when the user updates the proxy? How do you set the proxy? – albertjan Jul 25 '12 at 12:28
No, the system proxy is not updated. The system proxy is the default, but the user can specify a custom proxy, which is just valid for the application. – Wolfgang Ziegler Jul 25 '12 at 12:34
Do you use something like this: [click here!](http://stackoverflow.com/questions/186800/is-it-possible-to-specify-proxy-credentials-in-your-web-config) to update the proxy? – albertjan Jul 25 '12 at 12:37
Thx, you posted that URL before. But how does that handle the switch from system proxy to the "manually" configured one? – Wolfgang Ziegler Jul 25 '12 at 12:44
You can let `IsBypassed` return `false` or `true`. – albertjan Jul 25 '12 at 12:49
Give me some time to try that out. Thank you for your effort. – Wolfgang Ziegler Jul 25 '12 at 12:52

score 0 · Answer 2 · edited May 23 '17 at 10:27

You can override the GetChannelFactory and provide an implementation that can create a suitable endpoint i.e. a BasicHtppBinding with the proxy details added.

See here for a clue to how programmatically set Binding.