private com.google.protobuf.MapField<java.lang.String, java.lang.String>
        internalGetMutableHeaders() {
      if (headers_ == null) {
        headers_ = com.google.protobuf.MapField.newMapField(HeadersDefaultEntryHolder.defaultEntry);
      }
      if (!headers_.isMutable()) {
        headers_ = headers_.copy();
      }
      bitField0_ |= 0x00000001;
      onChanged();
      return headers_;
    }
<pre>
Options on how fetches should be made.
</pre>

Protobuf type {@code google.cloud.video.stitcher.v1.FetchOptions}
java-video-stitcher/proto-google-cloud-video-stitcher-v1/src/main/java/com/google/cloud/video/stitcher/v1/FetchOptions.java