code: public com.google.protobuf.ByteString
        getVersionUrlBytes() {
      java.lang.Object ref = versionUrl_;
      if (ref instanceof java.lang.String) {
        com.google.protobuf.ByteString b = 
            com.google.protobuf.ByteString.copyFromUtf8(
                (java.lang.String) ref);
        versionUrl_ = b;
        return b;
      } else {
        return (com.google.protobuf.ByteString) ref;
      }
    }
docs: <pre>
  Serving URL for this version. Example:
  "https://myversion-dot-myservice-dot-myapp.appspot.com"
  &#64;OutputOnly
  </pre>
  
  <code>string version_url = 109;</code>