From 3f9a991b5219d2fe1f103fc6318d7f24067bebc7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Sandro=20J=C3=A4ckel?= <sandro.jaeckel@gmail.com>
Date: Sun, 27 Jul 2025 04:33:06 +0200
Subject: [PATCH] Use werkzeug middleware for prefix to fix the path of static
 files

Closes #601
---
 libretranslate/app.py  | 15 +++++----------
 libretranslate/main.py |  5 ++++-
 2 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/libretranslate/app.py b/libretranslate/app.py
index 58907fc..7026cc1 100644
--- a/libretranslate/app.py
+++ b/libretranslate/app.py
@@ -189,8 +189,8 @@ def create_app(args):
 
     from libretranslate.language import load_languages
 
-    swagger_url = args.url_prefix + "/docs"  # Swagger UI (w/o trailing '/')
-    api_url = args.url_prefix + "/spec"
+    swagger_url = "/docs"  # Swagger UI (w/o trailing '/')
+    api_url = "/spec"
 
     bp = Blueprint('Main app', __name__)
 
@@ -1270,10 +1270,8 @@ def create_app(args):
 
     if args.debug:
         app.config["TEMPLATES_AUTO_RELOAD"] = True
-    if args.url_prefix:
-        app.register_blueprint(bp, url_prefix=args.url_prefix)
-    else:
-        app.register_blueprint(bp)
+
+    app.register_blueprint(bp)
 
     limiter.init_app(app)
 
@@ -1302,9 +1300,6 @@ def create_app(args):
 
     # Call factory function to create our blueprint
     swaggerui_blueprint = get_swaggerui_blueprint(swagger_url, api_url)
-    if args.url_prefix:
-        app.register_blueprint(swaggerui_blueprint, url_prefix=swagger_url)
-    else:
-        app.register_blueprint(swaggerui_blueprint)
+    app.register_blueprint(swaggerui_blueprint)
 
     return app
diff --git a/libretranslate/main.py b/libretranslate/main.py
index 4a279c7..c8a8e8e 100644
--- a/libretranslate/main.py
+++ b/libretranslate/main.py
@@ -4,6 +4,7 @@ import sys
 
 from libretranslate.app import create_app
 from libretranslate.default_values import DEFAULT_ARGUMENTS as DEFARGS
+from werkzeug.middleware.dispatcher import DispatcherMiddleware
 
 
 def get_args():
@@ -255,7 +256,9 @@ def get_args():
 
 def main():
     args = get_args()
-    app = create_app(args)
+    app = DispatcherMiddleware(None, {
+        args.url_prefix: create_app(args)
+    })
 
     if '--wsgi' in sys.argv:
         return app