When fetching attachments from confluence the fetch fails with the following message logged
[Worker thread '18'] ERROR org.apache.manifoldcf.crawler.connectors.confluence.client.ConfluenceClient - [Processing] Failed to get attachment https://confluence.myserver.com:443//confluence//rest/api/content/att100008061?expand=body.view,metadata.labels,space,history,version. Error: Confluence error. 404 Not Found
In this case, I'm hitting confluence version 6.4 but the double slashes are what causes the failure and they are produced by manifold.
(version 6.0.4 but note that the mangled URL is built by Manifold)