code: @BetaApi
    public final Operation setProxyHeaderTargetTcpProxy(
        String targetTcpProxy,
        TargetTcpProxiesSetProxyHeaderRequest targetTcpProxiesSetProxyHeaderRequestResource) {
  
      SetProxyHeaderTargetTcpProxyHttpRequest request =
          SetProxyHeaderTargetTcpProxyHttpRequest.newBuilder()
              .setTargetTcpProxy(targetTcpProxy)
              .setTargetTcpProxiesSetProxyHeaderRequestResource(
                  targetTcpProxiesSetProxyHeaderRequestResource)
              .build();
      return setProxyHeaderTargetTcpProxy(request);
    }
docs: Changes the ProxyHeaderType for TargetTcpProxy.
  
  <p>Sample code:
  
  <pre><code>
  try (TargetTcpProxyClient targetTcpProxyClient = TargetTcpProxyClient.create()) {
  ProjectGlobalTargetTcpProxyName targetTcpProxy = ProjectGlobalTargetTcpProxyName.of("[PROJECT]", "[TARGET_TCP_PROXY]");
  TargetTcpProxiesSetProxyHeaderRequest targetTcpProxiesSetProxyHeaderRequestResource = TargetTcpProxiesSetProxyHeaderRequest.newBuilder().build();
  Operation response = targetTcpProxyClient.setProxyHeaderTargetTcpProxy(targetTcpProxy.toString(), targetTcpProxiesSetProxyHeaderRequestResource);
  }
  </code></pre>
  
  @param targetTcpProxy Name of the TargetTcpProxy resource whose ProxyHeader is to be set.
  @param targetTcpProxiesSetProxyHeaderRequestResource
  @throws com.google.api.gax.rpc.ApiException if the remote call fails