The Java client library supports proxy settings for connecting to the API.
Settings
The library supports using the standard proxy settings for Java.
For HTTPS proxy set the proxy configuration as:
-Dhttps.proxyHost=HOST -Dhttps.proxyPort=PORT
For HTTP proxy (not recommended unless you're providing your own HTTP endpoint), set the proxy configuration as:
-Dhttp.proxyHost=HOST -Dhttp.proxyPort=PORT
It is possible to configure both HTTP and HTTPS proxy at runtime.
System.setProperty("https.proxyHost", HOST);
System.setProperty("https.proxyPort", PORT);
If you change this setting then you must recreate any service clients provided
by GoogleAdsClient.getVersionX().createYServiceClient().