Node* recv1 = RecvAtHost(
        ops::NodeOut(key_constant, 0), "F1", "F1", "O1", {DT_FLOAT, DT_FLOAT},
        b2.opts().WithAttr(kXlaHasHostTransferAttrName, true));
    Node* e = Binary(ops::NodeOut(recv1, 0), ops::NodeOut(recv1, 1),
                     b2.opts()
                         .WithName("E")
                         .WithControlInputs({recv1})

		// Call the ServeHTTP to execute the handler.
		apiRouter.ServeHTTP(recV2, reqV2)
		if recV2.Code != testCase.expectedRespStatus {
			t.Errorf("Test %d: %s: Expected the response status to be `%d`, but instead found `%d`", i+1, instanceType, testCase.expectedRespStatus, recV2.Code)
		}

		// read the response body.
		actualContent, err = io.ReadAll(recV2.Body)
		if err != nil {

    // CHECK:           %[[RECV0:.+]] = "tf._XlaRecvAtHost"(%[[PROGRAM0]])
    // CHECK-SAME:        device_ordinal = 0
    // CHECK-SAME:        key = "host_compute_channel_0_args"
    // CHECK-SAME:        _xla_has_host_transfer = true
    // CHECK:           %[[B0:.+]] = "tf.OpB"(%[[RECV0]]) : (tensor<2x2xi64>) -> tensor<2x2xi64>

			}
			if !cas.recv.IsValid() {
				t.Fatalf("%s\nselected #%d but internal error: missing recv value", fmtSelect(info), i)
			}
			if recv.Interface() != cas.recv.Interface() || recvOK != !cas.closed {
				if recv.Interface() == cas.recv.Interface() && recvOK == !cas.closed {

	return v.recv(false)
}

// internal recv, possibly non-blocking (nb).
// v is known to be a channel.
func (v Value) recv(nb bool) (val Value, ok bool) {
	tt := (*chanType)(unsafe.Pointer(v.typ()))
	if ChanDir(tt.Dir)&RecvDir == 0 {
		panic("reflect: recv on send-only channel")
	}
	t := tt.Elem
	val = Value{t, nil, flag(t.Kind())}
	var p unsafe.Pointer
	if t.IfaceIndir() {
		p = unsafe_New(t)
		val.ptr = p