Form digest for REST service

Question

Hi <o:p></o:p>
I have created a rest service to update list items in share point 2013. This needs to be consumed by a java application.I understand that any
POST request should have form digest in the header<o:p></o:p>
I tried to test this with a C# console application.I used /_api/contextinfo with a POST request with proper credentials,but i get 401unauthorised
error.<o:p></o:p>
How to get form digest by passing credentials from a java application.<o:p></o:p>

Answer 1

See if this helps:
http://msdn.microsoft.com/en-us/library/jj164022(office.15).aspx#WritingData
"You can retrieve this value by making a POST request with an empty body to
http://<site url>/_api/contextinfo"
Then extract the "d:FormDigestValue" node in the XML that was returned.
Also see here: (these aren't Java examples, but may give you an idea.)
http://blogs.msdn.com/b/nadeemis/archive/2012/10/23/tip-handling-http-403-forbidden-when-querying-the-search-rest-service-using-the-postquery-method.aspx
http://www.c-sharpcorner.com/UploadFile/d2ee01/how-to-modify-sharepoint-2013-objects-using-rest-calls/
Mike Smith TechTrainingNotes.blogspot.com
Books:
SharePoint 2007 2010 Customization for the Site Owner,
SharePoint 2010 Security for the Site Owner