feat: support reverse-proxy URL subpaths (llama-swap, SwarmUI) (#1122)

py/routes/handlers/model_handlers.py

@@ -50,6 +50,7 @@ from ...services.errors import RateLimitError, ResourceNotFoundError
 from ...utils.civitai_utils import resolve_license_payload
 from ...utils.file_utils import calculate_sha256
 from ...utils.metadata_manager import MetadataManager
+from ...utils.url_utils import relative_root_prefix
 
 LICENSE_FIELDS = (
     "allowNoCredit",
@@ -204,6 +205,7 @@ class ModelPageView:
                 "version": self._get_app_version(),
                 "provider_presets_json": json.dumps(PROVIDER_PRESETS),
                 "provider_models_json": "{}",
+                "rel_prefix": relative_root_prefix(request.path),
             }
 
             if not is_initializing:

py/routes/handlers/recipe_handlers.py

@@ -36,6 +36,7 @@ from ...utils.constants import NSFW_LEVELS
 from ...utils.directory_browser import WINDOWS_DRIVES_TOKEN, browse_directory
 from ...utils.exif_utils import ExifUtils
 from ...utils.recipe_open_stats import RecipeOpenStats
+from ...utils.url_utils import relative_root_prefix
 from ...recipes.merger import GenParamsMerger
 from ...recipes.enrichment import RecipeEnricher
 from ...services.websocket_manager import ws_manager as default_ws_manager
@@ -215,6 +216,7 @@ class RecipePageView:
                     settings=self._settings,
                     request=request,
                     t=self._server_i18n.get_translation,
+                    rel_prefix=relative_root_prefix(request.path),
                 )
             except Exception as cache_error:  # pragma: no cover - logging path
                 self._logger.error("Error loading recipe cache data: %s", cache_error)
@@ -223,6 +225,7 @@ class RecipePageView:
                     settings=self._settings,
                     request=request,
                     t=self._server_i18n.get_translation,
+                    rel_prefix=relative_root_prefix(request.path),
                 )
             return web.Response(text=rendered, content_type="text/html")
         except Exception as exc:  # pragma: no cover - logging path

py/routes/stats_routes.py

@@ -13,6 +13,7 @@ from ..services.server_i18n import server_i18n
 from ..services.service_registry import ServiceRegistry
 from ..services.model_query import normalize_sub_type, resolve_sub_type
 from ..utils.constants import VALID_LORA_SUB_TYPES, VALID_CHECKPOINT_SUB_TYPES
+from ..utils.url_utils import relative_root_prefix
 from ..utils.usage_stats import UsageStats
 
 logger = logging.getLogger(__name__)
@@ -106,6 +107,7 @@ class StatsRoutes:
                 settings=settings_manager,
                 request=request,
                 t=server_i18n.get_translation,
+                rel_prefix=relative_root_prefix(request.path),
             )
             
             return web.Response(

py/utils/url_utils.py

@@ -0,0 +1,18 @@
+"""Helpers for generating URLs that survive reverse-proxy subpath mounts."""
+
+from __future__ import annotations
+
+
+def relative_root_prefix(request_path: str) -> str:
+    """Return the relative prefix ("", "../", ...) that takes a manager page
+    back to the mount root.
+
+    Templates reference assets and pages with relative URLs (e.g.
+    ``{{ rel_prefix }}loras_static/...``) so the browser keeps whatever
+    subpath a reverse proxy (llama-swap, SwarmUI, ...) mounted ComfyUI under.
+    The backend only ever sees the stripped path, so the depth of the page
+    route is all that matters: "/loras" -> "", "/loras/recipes" -> "../".
+    """
+
+    segments = [segment for segment in request_path.split("/") if segment]
+    return "../" * max(len(segments) - 1, 0)