code: @BetaApi
    public final Operation setProxyHeaderTargetSslProxy(
        String targetSslProxy,
        TargetSslProxiesSetProxyHeaderRequest targetSslProxiesSetProxyHeaderRequestResource) {
  
      SetProxyHeaderTargetSslProxyHttpRequest request =
          SetProxyHeaderTargetSslProxyHttpRequest.newBuilder()
              .setTargetSslProxy(targetSslProxy)
              .setTargetSslProxiesSetProxyHeaderRequestResource(
                  targetSslProxiesSetProxyHeaderRequestResource)
              .build();
      return setProxyHeaderTargetSslProxy(request);
    }
docs: Changes the ProxyHeaderType for TargetSslProxy.
  
  <p>Sample code:
  
  <pre><code>
  try (TargetSslProxyClient targetSslProxyClient = TargetSslProxyClient.create()) {
  ProjectGlobalTargetSslProxyName targetSslProxy = ProjectGlobalTargetSslProxyName.of("[PROJECT]", "[TARGET_SSL_PROXY]");
  TargetSslProxiesSetProxyHeaderRequest targetSslProxiesSetProxyHeaderRequestResource = TargetSslProxiesSetProxyHeaderRequest.newBuilder().build();
  Operation response = targetSslProxyClient.setProxyHeaderTargetSslProxy(targetSslProxy.toString(), targetSslProxiesSetProxyHeaderRequestResource);
  }
  </code></pre>
  
  @param targetSslProxy Name of the TargetSslProxy resource whose ProxyHeader is to be set.
  @param targetSslProxiesSetProxyHeaderRequestResource
  @throws com.google.api.gax.rpc.ApiException if the remote call fails