How to Consume On Premise WCF Service in SharePoint online

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  You have several options.

  1. Provider-hosted Add-In. In this case you may use any hosting platform you want and consume the service in a way you are currently do.

  2. SharePoint-hosted app or any embedded javascript. In this case you need to make the service accessible from javascript

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  Thursday, August 2, 2018 11:22 AM
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  1) Provider-hosted Add-In - In this approach, do we need to publish the WCF outside the internal network premise?

  2) SharePoint-hosted app  - make the service accessible from javascript. It is not very clear. Please explain.

  Thursday, August 2, 2018 1:23 PM
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  1) Sure

  2) https://www.codeproject.com/Articles/845474/Enabling-CORS-in-WCF

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  Thursday, August 2, 2018 2:46 PM
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  Hi,

  For security reasons, cross-domain communication are blocking in SharePoint add-in, you need use web proxy to access data in your remote server.

  You could check below official guideline for more details.

  https://docs.microsoft.com/en-us/sharepoint/dev/sp-add-ins/query-a-remote-service-using-the-web-proxy-in-sharepoint  

  And you need publish your WCF service to internet so online users could request it.

  Best Regards,

  Lee

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  • Proposed as answer by Dennis Guo Monday, August 6, 2018 9:37 AM

  Friday, August 3, 2018 2:35 AM
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  Hi,

  I am checking to see how things are going there on this issue. Please let us know if you would like further assistance.

  You can mark the helpful post as answer to help other community members find the helpful information quickly.

  You can also share your own solution here and mark it as answer, and we can learn from each other.

  Best Regards,

  Lee

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  Tuesday, August 21, 2018 7:10 AM