[tharropoulos]

• pass the full URL to cached keep-alive connections, because Faraday merges a relative path into the base URL and drops . and .. segments
• stop documents['..'].delete from sending DELETE /collections/c/ and dropping the whole collection when keep-alive is on (same for items['..'] on synonym and curation sets)
• set the URL with req.url inside the request block, because passing an absolute URL to the verb makes Faraday read proxy env vars on every request
• lower-case the node protocol in uri_for, because Faraday 2.9.2 and later treat HTTP://... as a relative path
• add request-target specs for one-shot, keep-alive and an upper-case protocol, plus a real-server check that deleting document .. leaves the collection in place