feat: add support for X-Forwarded-Port in ProxyFix middleware (#13102)

api/configs/feature/__init__.py

     )
 
     RESPECT_XFORWARD_HEADERS_ENABLED: bool = Field(
-        description="Enable or disable the X-Forwarded-For Proxy Fix middleware from Werkzeug"
-        " to respect X-* headers to redirect clients",
+        description="Enable handling of X-Forwarded-For, X-Forwarded-Proto, and X-Forwarded-Port headers"
+        " when the app is behind a single trusted reverse proxy.",
         default=False,
     )
 

api/extensions/ext_proxy_fix.py

     if dify_config.RESPECT_XFORWARD_HEADERS_ENABLED:
         from werkzeug.middleware.proxy_fix import ProxyFix
 
-        app.wsgi_app = ProxyFix(app.wsgi_app)  # type: ignore
+        app.wsgi_app = ProxyFix(app.wsgi_app, x_port=1)  # type: ignore

docker/nginx/proxy.conf.template

 proxy_set_header Host $host;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $scheme;
+proxy_set_header X-Forwarded-Port $server_port;
 proxy_http_version 1.1;
 proxy_set_header Connection "";
 proxy_buffering off;