My colleagues asked to figure out how to use rest api in Sharepoint (Project) on premise (not online! not sharepoint.com!).Get requests work fine with NTLM auth via Postman.Troubles started when i tried any POST, PUT requests.I figured out that i need to put the X-RequestDigest header which I had got via a POST request to {{ProjectServerUrl}}/_api/contextinfo.
Now when I try POST, PUT, DELETE requests with X-RequestDigest header i get this error:
The security validation for this page is invalid. Click Back in your Web browser, refresh the page, and try your operation again.<nativehr>0x8102006d</nativehr><nativestack></nativestack>
I rummaged all StackOverflow to find any solutions. No results.