UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: unexpected server response (500)

I want to do something on several tabs, so here is my code:

const CDP = require('chrome-remote-interface');

var Tab = ( function()  {
      process : function(url){
			CDP.New({'url':url}, function (err, target) {				
				if (!err) {
					CDP((client) => {
						const {Network, Page, Runtime} = client;
						Network.enable();
						Page.enable();
						Runtime.enable();
                                                Page.navigate({url: URL});
                                                     ....
                                                do something
                                        });
                                 }
                           });
        }
})();

function openUrl(url) {		     		
        var tab = new Tab();
        tab.process(url);   
}
openUrl('http://github.com');
openUrl('http://google.com');

Then error: (node:8700) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: unexpected server response (500)

The function openUrl() will be called when there are some post requests. Therefore, I use two lines of openUrl() to represent.

I think the error may be happened when

CDP( (client) =>{          
});

Is CDP() just allow being used once? How can I deal with the muli-tab problem? I need to do something on different tabs asynchronously…

[cyrus-and]

This works fine for me, can you try it?

const CDP = require('chrome-remote-interface');

var Tab = function () {
    return {
        process: function (url) {
            CDP.New({'url':url}, function (err, target) {
                console.log(target);
                if (!err) {
                    CDP({target}, (client) => {
                        const {Network, Page, Runtime} = client;
                        Network.enable();
                        Page.enable();
                        Runtime.enable();
                        Page.navigate({url: url});
                        console.log('do something');
                    });
                }
            });
        }
    };
};

function openUrl(url) {
    var tab = new Tab();
    tab.process(url);
}

openUrl('http://github.com');
openUrl('http://google.com');

[cyrus-and]

OK, that’s because I suggested to use the target option which has been introduced in v0.20.0 while you were using an older release (which uses tab instead). You’re welcome!