How to get request digest value from provider hosted app?

Question

I am developing SharePoint 2013 Provider hosted app using javascript REST Api. In order to perform create (POST), or update (MERGE) operations on sharepoint items I need to set

Answer 1

Ok, I made a fresh provider hosted application to re-test the problem.

You can view the repository here:

https://github.com/mattmazzola/providerhosted_01

After comparing this new application and the old one, I realized I had a misunderstanding of how the SP.RequestExecutor expected urls to be constructed. I thought it was required to use the SP.AppContextSite() endpoint.

I was incorrectly constructing a request to the appWeb with a url similar to the following:

https://contoso-6f921c6addc19f.sharepoint.com/ProviderHostedApp/_api/SP.AppContextSite(@target)/contextinfo?@target=%27https%3A%2F%2Fcontoso-6f921c6addc19f.sharepoint.com%2FProviderHostedApp%27

As you can see, the @target was set to the appWeb url but infact when making request to the appWeb using RequestExecutor you do no need to do this. It is simply appweburl + "/_api/contextinfo". It is only when making requests for resources existing on the hostWeb that you need use the AppContextSite and set the @target.

You can see the full code in the linked solution for more details. I have added a screenshot of the solution.