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