We are trying to use the API in order to look @ the <d:Url> element below and search for anything in this particular library that starts with http://. This is the link you get when using the Document ID or "..." from the item in the library. All files in this library should start with https://, so we're trying to discover those beginning with http://. Both http and https are still supported, but we're migrating to an https: environment.
<d:Title>MyPowerPoint.ppt</d:Title>
- <d:OData__dlc_DocIdUrl m:type="SP.FieldUrlValue">
<d:Description>AAABBBCCC-355105229-2747</d:Description>
<d:Url>http://mysite.com/sites/ABC006/_layouts/15/DocIdRedir.aspx?ID=AAABBBCCC-355105229-2747</d:Url>
</d:OData__dlc_DocIdUrl>
<d:Name m:null="true" />
</m:properties>
</content>
The following endpoints give me a 500 error (I've tried using _dlc_DocIdUrl and OData__dlc_DocIdUrl)
http://mysite.com/sites/ABC006/_api/web/lists/getbytitle('TECHLib')/items?$select=Title,Name,OData__dlc_DocIdUrl&$top=5000&$filter=startswith(_dlc_DocIdUrl,'http://')
http://mysite.com/sites/ABC006/_api/web/lists/getbytitle('TECHNlib')/items?$select=Title,Name,OData__dlc_DocIdUrl&$top=5000&$filter=substringof('http:',OData__dlc_DocIdUrl)