@java.lang.Override
  public void writeTo(com.google.protobuf.CodedOutputStream output) throws java.io.IOException {
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(name_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 1, name_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(requestId_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 2, requestId_);
    }
    if (!com.google.protobuf.GeneratedMessageV3.isStringEmpty(etag_)) {
      com.google.protobuf.GeneratedMessageV3.writeString(output, 3, etag_);
    }
    getUnknownFields().writeTo(output);
  }
<pre>
Optional. Checksum used to ensure that the user-provided value is up to
date before the server processes the request. The server compares provided
checksum with the current checksum of the resource. If the user-provided
value is out of date, this request returns an `ABORTED` error.
</pre>

<code>string etag = 3 [(.google.api.field_behavior) = OPTIONAL];</code>

@return The bytes for etag.
java-vmwareengine/proto-google-cloud-vmwareengine-v1/src/main/java/com/google/cloud/vmwareengine/v1/DeleteVmwareEngineNetworkRequest.java