The following tables shows possible scenarios for accessing data in SharePoint 2013 from a remote app.
| App Type | Access to data in SharePoint | |
|---|---|---|
| 1 | SharePoint-hosted | Page in app-web accessing host-web data using the cross domain library and REST |
| 2 | SharePoint-hosted | Page in app-web accessing host-web data using JavaScript CSOM |
| 3 | Cloud (auto-hosted / provider-hosted) | Remote HTML page which JavaScript CSOM to access data in app web |
| 4 | Cloud (auto-hosted / provider-hosted) | Remote HTML page which crafts a standard AJAX request to host-web or other SharePoint site, adding an OAuth token to the ‘Authorization’ header |
| 5 | Cloud (auto-hosted / provider-hosted) | Remote .NET code (e.g. web service, scheduled task etc.) which uses the .NET CSOM to request data in host web or other SharePoint site (using TokenHelper class to pass OAuth token) |
| 6 | Cloud (auto-hosted / provider-hosted) | Remote ASP.NET page server code which uses TokenHelper class to pass OAuth token and HttpWebRequest class to access list data via oData query in the web-host Uri |
| 7 | Cloud (auto-hosted / provider-hosted) | Remote HTML/ASPX page which uses cross-domain library to access data in host-web (maybe – haven’t seen this done yet) |
Options for accessing SharePoint data from your remote app or inbound scenarios
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Options for accessing data on your remote app from SharePoint or outbound scenarios
Reference: Data access options for apps in SharePoint 2013
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