public Builder setHeader(com.google.cloud.visionai.v1.PacketHeader.Builder builderForValue) {
      if (headerBuilder_ == null) {
        header_ = builderForValue.build();
      } else {
        headerBuilder_.setMessage(builderForValue.build());
      }
      bitField0_ |= 0x00000001;
      onChanged();
      return this;
    }
<pre>
The packet header.
</pre>

<code>.google.cloud.visionai.v1.PacketHeader header = 1;</code>
java-visionai/proto-google-cloud-visionai-v1/src/main/java/com/google/cloud/visionai/v1/Packet.java