code: public java.lang.String getSourceUrl() {
      java.lang.Object ref = sourceUrl_;
      if (ref instanceof java.lang.String) {
        return (java.lang.String) ref;
      } else {
        com.google.protobuf.ByteString bs = 
            (com.google.protobuf.ByteString) ref;
        java.lang.String s = bs.toStringUtf8();
        sourceUrl_ = s;
        return s;
      }
    }
docs: <pre>
  URL of the zip file to deploy from. Must be a URL to a resource in
  Google Cloud Storage in the form
  'http(s)://storage.googleapis.com/&#92;&lt;bucket&#92;&gt;/&#92;&lt;object&#92;&gt;'.
  </pre>
  
  <code>string source_url = 3;</code>