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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 ...
- 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?
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
amalwayscharan Try using the SPHttpClient to make calls to the API (context.spHttpClient) . This is setup to send CORS friendly calls.
Have a look here for an overview of making calls to APIs with CORS setup - https://tahoeninjas.blog/2019/02/05/getting-around-cors-issues-in-spfx-with-sphttpclient/