I am trying to execute example mentioned in forum to test "Copy a Document

I am suggesting that because I was able to reproduce the "Unable to retrieve RequestDigest from SharePoint to execute POST request" error in my environment by using the IP of my Sharepoint server instead of the hostname. Suggestions will always me made after testing and confirming that this can be the root cause.

Let me explain, why. Sharepoint servers have a concept called Alternate Access Mappings; only the URLs listed as Alternate Access Mappings are considered valid for the Sharepoint server. By default Sharepoint will use only the hostname:

http://mysharepointserver

but you can have as many alternate access mappings as you want such as:

mysharepointserver.mycompany.com

in your case it seems that you haven't configured access mappings properly therefore it's expected you get, for some requests (i.e. Appian connectors) that require to get the RequestDigest first, an error like this.

Simply configure your access mappings properly or update your constant to be
http://mysharepointserver

or

mysharepointserver.mycompany.com

depending on what your current access mappings are.

Attached you will see an example of me reproducing the issue.

Here's how you configure them technet.microsoft.com/.../cc263208(v=office.15).aspx

I am suggesting that because I was able to reproduce the "Unable to retrieve RequestDigest from SharePoint to execute POST request" error in my environment by using the IP of my Sharepoint server instead of the hostname. Suggestions will always me made after testing and confirming that this can be the root cause.

Let me explain, why. Sharepoint servers have a concept called Alternate Access Mappings; only the URLs listed as Alternate Access Mappings are considered valid for the Sharepoint server. By default Sharepoint will use only the hostname:

http://mysharepointserver

but you can have as many alternate access mappings as you want such as:

mysharepointserver.mycompany.com

in your case it seems that you haven't configured access mappings properly therefore it's expected you get, for some requests (i.e. Appian connectors) that require to get the RequestDigest first, an error like this.

Simply configure your access mappings properly or update your constant to be
http://mysharepointserver

or

mysharepointserver.mycompany.com

depending on what your current access mappings are.

Attached you will see an example of me reproducing the issue.

Here's how you configure them technet.microsoft.com/.../cc263208(v=office.15).aspx