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enossirenossir 

Canvass app works in canvass previewer but not in lightning component/application

<aura:component implements="force:appHostable,flexipage:availableForAllPageTypes" access="global" >
    <force:canvasApp developerName="testApp" namespacePrefix="" parameters='{"xxx":"123","yyy":"4444"}'  width="infinite" /> 
</aura:component>


<aura:application >
    <c:CanvasComp/>
</aura:application>

So when i use the canvass app previewer it works, when i try in dev console previewer it doesnt work and as a quick action it also fails.
Raj VakatiRaj Vakati
You can not able to load the canvas using the standalone aura:application 

force:canvasApp  support only  Lightning Experience, Lightning Communities, Salesforce Mobile App


Try to add this component to the record page and test it