Application Version (from "Chrome Settings > About Chrome"): 60.03112.116
Android Build Number (from "Android Settings > About Phone/Tablet"): 6.01
Device: Galaxy Note4

Steps to reproduce: 
on MayLaunchUrl

Observed behavior: 
when i use MayLaunchUrl with my application, there is no pre-rendering occured
i checked my server's log. but nothing connecting or request.
it's not only for my application.because your demo also didn't connect anything.
do i need to change my manifest or add code after MayLaunchUrl??

here is my code plz check any thing wrong.


public class MainActivity extends AppCompatActivity{

 CustomTabServiceController customTabServiceController;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        customTabServiceController=new CustomTabServiceController(this,"my Server URL");
        customTabServiceController.bindCustomTabService();  
 }

public class CustomTabServiceController extends CustomTabsServiceConnection {
    private static final String PKG_NAME_CHROME = "com.android.chrome";

    private WeakReference<Context> mContextWeakRef;
    private String mWebsiteUrl;
    private CustomTabsSession mCustomTabsSession;

    public CustomTabServiceController(Context context, String websiteUrl) {
        mContextWeakRef = new WeakReference<Context>(context);
        mWebsiteUrl = websiteUrl;
    }

    @Override
    public void onCustomTabsServiceConnected(ComponentName componentName, CustomTabsClient customTabsClient) {

        if (customTabsClient != null) {
            customTabsClient.warmup(0);

            // Create a new session
            mCustomTabsSession = customTabsClient.newSession(null);

            // Let the session know that it may launch a URL soon
            if (!TextUtils.isEmpty(mWebsiteUrl)) {
                Uri uri = Uri.parse(mWebsiteUrl);
                if (uri != null && mCustomTabsSession != null) {

                    // If this returns true, custom tabs will work,
                    // otherwise, you need another alternative if you don't want the user
                    // to be launched out of the app by default
                    Bundle headers=new Bundle();
                    headers.putString("Cookie","name=test1");
                    boolean mayLaunchResult=mCustomTabsSession.mayLaunchUrl(uri, headers, null);
                    Log.d("testChromeTap","may launch occur : "+mayLaunchResult);


                }
            }
        }
    }

    @Override
    public void onServiceDisconnected(ComponentName componentName) {
        mCustomTabsSession = null;
    }

    public void bindCustomTabService() {
        Context ctx = mContextWeakRef.get();
        if (ctx != null) {
            Log.d("testChromeTap","open binding");
            CustomTabsClient.bindCustomTabsService(ctx, PKG_NAME_CHROME, this);
        }
    }

    public void unbindCustomTabService() {
        Context ctx = mContextWeakRef.get();
        Log.d("testChromeTap","close binding");
        if (ctx != null) {
            ctx.unbindService(this);
        }
    }
}

Expected behavior: 
pre-rendering or connection with my apache server
Frequency: 
i try it around 10 times
<number of times you were able to reproduce> 

Additional comments: 
if you hard to fix it plz give me any example code with MayLaunchUrl.(your demo isn't works... plz optimize for MayLaunch)...