Lightning Out : Error 404, Blocked by CORS

To test Lightning Out on an external site, I use the application created in the "Aura Components Basics" module: expensesApp

This one works very well the proof in image:

Pour To make my application available with lightning out, I helped myself to this blog: https://newstechnologystuff.com/2019/05/28/use-lightning-web-components-in-lightning-out/

1. I add the url of site which must integrate my application in the CORS
2. I created a new dedicated application for lightning out "LightOutApp"

 <aura:application access="GLOBAL" extends="ltng:outApp" implements="ltng:allowGuestAccess"> <aura:dependency resource="c:expenses" type="COMPONENT"/> </aura:application> 

Here's the code for my expenses component :

 <aura:component controller="ExpensesController"> <aura:attribute name="expenses" type="Expense__c[]"/> <aura:handler name="updateExpense" event="c:expensesItemUpdate" action="{!c.handleUpdateExpense}"/> <aura:handler name="createExpense" event="c:expensesItemUpdate" action="{!c.handleCreateExpense}"/> <aura:handler name="init" action="{!c.doInit}" value="{!this}"/> <!-- PAGE HEADER --> <lightning:layout class="slds-page-header slds-page-header--object-home"> <lightning:layoutItem> <lightning:icon iconName="standard:scan_card" alternativeText="My Expenses"/> </lightning:layoutItem> <lightning:layoutItem padding="horizontal-small"> <div class="page-section page-header"> <h1 class="slds-text-heading--label">Expenses</h1> <h2 class="slds-text-heading--medium">My Expenses</h2> </div> </lightning:layoutItem> </lightning:layout> <!-- / PAGE HEADER --> <!-- NEW EXPENSE FORM --> <lightning:layout > <lightning:layoutItem padding="around-small" size="6"> <c:expenseForm/> </lightning:layoutItem> </lightning:layout> <lightning:layout> <lightning:layoutItem padding="around-small" size="6"> <c:expensesList expenses="{!v.expenses}"/> </lightning:layoutItem> <lightning:layoutItem padding="around-small" size="6"> Put something cool here </lightning:layoutItem> </lightning:layout> </aura:component> 

3. I added the code JS on the page of the site which must display my component, here :

<div id="lightning"></div> <script src="https://playful-fox-o26ov9-dev-ed.lightning.force.com/lightning/lightning.out.js"></script> <script> $Lightning.use("c:LightOutApp", function() { $Lightning.createComponent("c:expenses", { authToken: "3MVG9Ve.2wqUVx_Z3nFMx_ytwdm0WnBAnowDB1mvO.d6trt4DDAipWp7tno3.lNL2YWT.jj0h0MHoxKTObe3D" }, "lightning", function(cmp) { console.log("component was created"); // do some stuff } ); }, 'https://playful-fox-o26ov9-dev-ed.lightning.force.com/' ); </script> 

but when I load the page, I always get the following error in my chrome JS console:

Access to XMLHttpRequest at 'https://playful-fox-o26ov9-dev-ed.lightning.force.com//c/LightOutApp.app?aura.format=JSON&aura.formatAdapter=LIGHTNING_OUT' from origin 'https://webidetesting6929559-p2000088220trial.dispatcher.hanatrial.ondemand.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. /webapp/resources/sap/ui/core/messagebundle_fr_FR.properties:1 Failed to load resource: the server responded with a status of 404 ()

I forgot something ? The syntax of my code is not good?

You can test the integration and see the error message at this address :

https://nashle.github.io/lightningout/

Here is the picture of my CORS:

I wonder if this comes from the configuration of the Online Application or the fact that it may be necessary to activate community. Do you know what settings I need to fill in when I create my Connected App?

So you need to configure a community to access my lightning-out application on a third-party portal that does not have to be hosted by the community to provide access rights?

I implement ltng: allowGuestAccess "to Share Lightning App with Non-Authenticaded Users.

Aloha!