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amalwayscharan's avatar
amalwayscharan
Copper Contributor
Jul 29, 2019
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SharePoint Office 365 : CORS issue, REST API call to other application from SharePoint Online

When trying to access 3rd party REST API (EasyVista) from SharePoint web page, it shows No 'Access-Control-Allow-Origin' header is present on the requested resource. I've tried passing username and ...
  • paulpascha's avatar
    paulpascha
    Jul 30, 2019
    CORS policies need to be configured on the EasyVista side to allow calls from JavaScript hosted in your SharePoint site which is in another domain. I don't know EasyVista and the options it provides for configuring CORS, maybe it provides support for JSONP as an alternative.

    Alternatively you could develop your own Web API as a wrapper around the EasyVista service and configure CORS for your Web API. Server-side calls between your Web API and EasyVista won't be an issue.

    Does this make sense?
paulpascha's avatar
paulpascha
Bronze Contributor
Jul 30, 2019
CORS policies need to be configured on the EasyVista side to allow calls from JavaScript hosted in your SharePoint site which is in another domain. I don't know EasyVista and the options it provides for configuring CORS, maybe it provides support for JSONP as an alternative.

Alternatively you could develop your own Web API as a wrapper around the EasyVista service and configure CORS for your Web API. Server-side calls between your Web API and EasyVista won't be an issue.

Does this make sense?
amalwayscharan's avatar
amalwayscharan
Copper Contributor
Jul 30, 2019

Thank you paulpascha, for your reply. I don't think EasyVista has a way to enable CORS on it's end. I checked their documentation, it doesn't mentioned anything related to CORS. 

 

I like you alternative suggestion, a quick question here : Is this the only way to access 3rd party API with CORS issue? Or should I research on SPFX/OAuth ? 

 

Pardon my ignorance if any, I'm still learning the SP framework

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