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Power Platform Community / Forums / Power Apps / How to call external a...
Power Apps
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How to call external api which has disabled CORS?

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Posted on by Ethan.s 115

Hi, 

I think there are 4 ways to access external API as below:

 1, an Azure function triggered by a webhook

 2, use xrm.webapi.online.execute method

 3, use a custom connector in a power automate flow

 4, a plug-in attached to a custom action called from JavaScript

but if the API disabled CORS, seems only the custom connector in flow could access the API. but WHY?...

Will all other ways  encounter the CORS error, and why?...

 

THANK YOU !!!

Categories:
Microsoft Dataverse with Power Apps
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  • Verified answer
    ChrisPiasecki Profile Picture
    ChrisPiasecki 6,422 Most Valuable Professional on at
    Re: How to call external api which has disabled CORS?

    Hi @sukie_y,

     

    It's important to understand that CORS is not a security feature, it's a browser feature that relaxes security.. If CORS is disabled on an external API, then only requests that originate from the same domain (same origin policy ) as the API can be made. This only applies to scripts (e.g. JavaScript) running in the browser). It does not apply in non-interactive server to server scenarios. 

     

    You should not run into a CORS error if calling the Web API from a Dataverse Plugin, Azure Function, or Power Automate flow. If you're trying to call it from a JavaScript web resource in Dataverse (which you should not be doing anyway if any credentials are being passed) then you'd experience a CORS error if CORS is disabled on the external API. 

     

     

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  • Ethan.s Profile Picture
    Ethan.s 115 on at
    Re: How to call external api which has disabled CORS?

    Hi @ChrisPiasecki 
    Thank you for the explain of CORS !!

    That's what I have be confused.

    Thank you !

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