RFC 7617 is unsupported by httpfs

DuckDB / httpfs does not support username:password@ style URLs (RFC 7617)

% duckdb
DuckDB v1.4.4 (Andium) 6ddac802ff
Enter ".help" for usage hints.
Connected to a transient in-memory database.
Use ".open FILENAME" to reopen on a persistent database.
D SELECT content FROM read_text('https://testuser:testpass@httpbin.org/basic-auth/testuser/testpass');
IO Error:
Could not establish connection error for HTTP HEAD to 'https://testuser:testpass@httpbin.org/basic-auth/testuser/testpass'

I've added a PR to add RFC 7617 support.
https://github.com/duckdb/duckdb-httpfs/pull/228

Start with the reported DuckDB read_text query in httpfs and review the linked pull request #228, which already proposes RFC 7617 support. Verify the behavior against the httpbin basic-auth URL and confirm that username:password@ URLs work successfully without breaking existing HTTP requests.

Written by the indexing model from the issue text.