@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (((bitField0_ & 0x00000001) != 0)) {
      output.writeMessage(1, getHeaders());
    }
    getUnknownFields().writeTo(output);
  }
<pre>
The HTTP headers of the ad request.
</pre>

<code>.google.protobuf.Struct headers = 1;</code>
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/RequestMetadata.java