Accessing Google APIs through a proxy with .Net

Recently I’ve been replacing the use of as a link shortener with Google’s link shortener service ( in one of our .Net projects.

It’s pretty easy to get going with their handy .Net NuGet package and sample code, however what wasn’t obvious was how to pass the HTTP requests through a proxy. After a bit of digging around, it turned out to be pretty easy:

The first thing that needs to be done is to create our own ProxySupportedHttpClientFactory class, which inherits from the Google APIs HttpClientFactory class and override the CreateHandler method to return a different handler:

public class ProxySupportedHttpClientFactory : HttpClientFactory
  protected override HttpMessageHandler CreateHandler(CreateHttpClientArgs args)
    var proxy = new WebProxy("http://proxyserver:8080", true, null, null);

    var webRequestHandler = new WebRequestHandler()
      UseProxy = true,
      Proxy = proxy,
      UseCookies = false

    return webRequestHandler;

The next step is to then use our new ProxySupportedHttpClientFactory when creating the UrlshortenerService:

var credentials = ....

var linkService = new Google.Apis.Urlshortener.v1.UrlshortenerService(new BaseClientService.Initializer()
  HttpClientInitializer = credentials,
  ApplicationName = "MyURLThingy",
  HttpClientFactory = new ProxySupportedHttpClientFactory()

And that’s it.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s