fix(client): preserve hub path prefix when building the ws url

_to_ws_url documented that it keeps the port and any path prefix, but it
only kept u.netloc and appended the ws path, so a scheme'd url like
https://hub.example.com/zhub lost the /zhub prefix. A hub reverse-proxied
under a path was silently routed to the wrong /ws endpoint. Keep u.path as
a prefix (stripping a trailing slash); the bare-host branch splits host
from prefix the same way. Port handling is unchanged.

Author: Zawwarsami16

zhub/client.py

@@ -48,10 +48,17 @@ def _to_ws_url(http_or_ws_url: str, ws_path: str) -> str:
     Accepts already-ws URLs. Preserves port + path prefix."""
     u = urlparse(http_or_ws_url)
     scheme = {"https": "wss", "http": "ws", "wss": "wss", "ws": "ws"}.get(u.scheme, "wss")
-    netloc = u.netloc or u.path  # in case user passed bare host
+    netloc = u.netloc
+    prefix = u.path
+    if not netloc:
+        # No scheme given — urlparse puts the whole "host[/prefix]" in u.path.
+        host, _, rest = u.path.partition("/")
+        netloc = host
+        prefix = f"/{rest}" if rest else ""
     if not netloc:
         raise ValueError(f"could not parse hub url: {http_or_ws_url}")
-    return f"{scheme}://{netloc}{ws_path}"
+    prefix = prefix.rstrip("/")
+    return f"{scheme}://{netloc}{prefix}{ws_path}"
 
 
 # ---- publish mode --------------------------------------------------------