(.NET Core C#) SharePoint -- Approve a File Submitted for Content Approval

Approves the file submitted for content approval with the specified comment.

Note: The SharePoint list or library should have the settings enabled to require approval for submitted items. This is done in the "Versioning Settings" for the list or library.

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//  This requires the Chilkat API to have been previously unlocked.
//  See Global Unlock Sample for sample code.

Chilkat.Http http = new Chilkat.Http();

//  If SharePoint Windows classic authentication is used, then set the
//  Login, Password, LoginDomain, and NtlmAuth properties.
http.Login = "SHAREPOINT_USERNAME";
http.Password = "SHAREPOINT_PASSWORD";
http.LoginDomain = "SHAREPOINT_NTLM_DOMAIN";
http.NtlmAuth = true;

//  The more common case is to use SharePoint Online authentication (via the SPOIDCRL cookie).
//  If so, do not set Login, Password, LoginDomain, and NtlmAuth, and instead
//  establish the cookie as shown at SharePoint Online Authentication

//  Indicate that we want a JSON reply
http.Accept = "application/json;odata=verbose";

//  Only persons who have Full Control or Design permissions can approve or reject
//  items or files in a list or library that requires approval. Other site users
//  can only view what they have permission to view or what they have uploaded
//  themselves.
// 
//  Important:  Approval or rejection of items or files in lists or libraries must
//  be done one at a time. You cannot approve or reject multiple items or files in
//  one operation.
// 

Chilkat.HttpRequest req = new Chilkat.HttpRequest();
req.HttpVerb = "POST";
req.Path = "/_api/web/GetFileByServerRelativeUrl('/ChilkatDocLibrary/sample.docx')/approve(comment='Check-in comment for the approval.')";

//  We need to add a form digest value in the X-RequestDigest header field.
//  See this example for details on
//  how to get (and cache) a form digest value
req.AddHeader("X-RequestDigest","SHAREPOINT_FORM_DIGEST");

//  Send the request to approve the document.
bool bUseTls = true;
Chilkat.HttpResponse resp = http.SynchronousRequest("SHAREPOINT_HTTPS_DOMAIN",443,bUseTls,req);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

//  A successful update will return a 200 status code with an empty body.
//  A non-successful update will return a JSON response body..
if (resp.StatusCode != 200) {
    Debug.WriteLine("Response status code = " + Convert.ToString(resp.StatusCode));
    Chilkat.JsonObject json = new Chilkat.JsonObject();
    json.Load(resp.BodyStr);
    json.EmitCompact = false;
    Debug.WriteLine(json.Emit());
    Debug.WriteLine("Failed");

    return;
}

Debug.WriteLine("Success.");