text: function* FindProxyForURL(url, host) {
      if (yield isHostInAnySubnet(host, [
              '10.1.2.0',
              '10.1.3.0'
          ], '255.255.255.0')) {
          return 'HTTPS proxy.example.com';
      }
      if (yield isHostInAnySubnet(host, [
              '10.2.2.0',
              '10.2.3.0'
          ], '255.255.255.0')) {
          return 'HTTPS proxy.example.com';
      }
      return 'DIRECT';
  }
  function* isHostInAnySubnet(host, subnets, mask) {
      var subnets_length = subnets.length;
      for (i = 0; i < subnets_length; i++) {
          if (yield isInNet(host, subnets[i], mask)) {
              return true;
          }
      }
  }
  