feat: implement native subdomain routing (*.hub.yesminedor.tn) for seamless absolute assets resolution across all universes

app/proxy.py

@@ -40,7 +40,7 @@ async def close_http_client():
 def rewrite_cookie_path(cookie_header: str, universe_id: str) -> str:
     """
     Rewrites the Path attribute of a Set-Cookie header to /u/{universe_id}/
-    to strictly isolate session cookies between Hermes universes.
+    when using path-based proxying.
     """
     target_path = f"/u/{universe_id}/"
     if re.search(r'(?i)\bpath=[^;]*', cookie_header):
@@ -83,9 +83,15 @@ async def proxy_request(
     for key, value in request.headers.items():
         if key.lower() not in HOP_BY_HOP_HEADERS and key.lower() != "host":
             req_headers[key] = value
+            
+    # Forward original host header info
+    req_headers["x-forwarded-host"] = request.headers.get("host", "")
+    req_headers["x-forwarded-proto"] = request.url.scheme or "http"
     
     body = await request.body()
     
+    is_path_proxied = universe_id and request.url.path.startswith(f"/u/{universe_id}")
+    
     try:
         upstream_req = client.build_request(
             method=request.method,
@@ -107,12 +113,12 @@ async def proxy_request(
             if k_str in HOP_BY_HOP_HEADERS:
                 continue
                 
-            if k_str == "set-cookie" and universe_id:
-                # Cloisonnement strict des cookies de session par univers
+            if k_str == "set-cookie" and is_path_proxied:
+                # Path-based proxying: rewrite cookie path
                 v_str = rewrite_cookie_path(v_str, universe_id)
                 raw_headers.append((b"set-cookie", v_str.encode("latin-1")))
-            elif k_str == "location" and universe_id:
-                # Réécriture de la redirection si le backend renvoie vers la racine /
+            elif k_str == "location" and is_path_proxied:
+                # Path-based proxying: rewrite location redirect
                 if v_str.startswith("/") and not v_str.startswith(f"/u/{universe_id}"):
                     v_str = f"/u/{universe_id}{v_str}"
                 raw_headers.append((b"location", v_str.encode("latin-1")))