text: Title: Issue with Gradio assets not loading through Nginx reverse proxy
  Body: ### Describe the bug
  
  When accessing a Gradio application through Nginx reverse proxy, the main page loads but static assets (JS/CSS) fail to load with 404 errors when the page attempts to fetch them automatically.
  
  ### Have you searched existing issues?  🔎
  
  - [X] I have searched and found no existing issues
  
  ### Reproduction
  
  ### gradio code
  ```python
    import gradio as gr
    import time
    def test(x):
        time.sleep(4)
        return x
    gr.Interface(test, "textbox", "textbox").queue().launch(
        root_path="/webui", # add i also try to use nginx+http://0.0.0.0:7861/ with no root_path="/webui"
        server_name="0.0.0.0",
        server_port=7861
    )
  ```
  
  ### Current Behavior
  - `localhost:9999/webui` loads successfully and returns the Gradio web interface
  - When the page tries to fetch its assets, the following requests return 404:
    - `localhost:9999/assets/index-Dj1xzGVg.js`
    - `localhost:9999/assets/index-Bmd1Nf3q.css`
  
  I manually tried accessing with the /webui prefix, but still got 404:
  - `localhost:9999/webui/assets/index-Dj1xzGVg.js`
  - `localhost:9999/webui/assets/index-Bmd1Nf3q.css`
  
  However, accessing directly through port 7861 works:
  - `localhost:7861/webui/assets/index-Dj1xzGVg.js`
  - `localhost:7861/webui/assets/index-Bmd1Nf3q.css`
  
  ### Expected Behavior
  Static assets should load correctly when accessing the application through the Nginx reverse proxy at `localhost:9999/webui`.
  
  ### Question
  Is there something wrong with my configuration? How can I properly serve Gradio's static assets through the Nginx reverse proxy?
  
  ### Additional Notes
  - The main application interface loads correctly
  - Static assets (JS/CSS) fail to load when the page tries to fetch them automatically
  - Direct access to the Gradio server works as expected
  
  ### Nginx Configuration
  ```
  server {
      listen 9999;  
      server_name _; 
  
      root /root;
      index index.php index.html index.htm;
  
      location / {
          try_files $uri $uri/ /index.php?$query_string;
      }
  
      location ~ [^/]\.php(/|$) {
          try_files $uri =404;
          fastcgi_pass unix:/run/php/php8.1-fpm.sock;
          fastcgi_index index.php;
          set $path_info $fastcgi_path_info;
          set $real_script_name $fastcgi_script_name;
          if ($fastcgi_script_name ~ "^(.+?\.php)(/.+)$") {
              set $real_script_name $1;
              set $path_info $2;
          }
          fastcgi_param SCRIPT_FILENAME $document_root$real_script_name;
          fastcgi_param SCRIPT_NAME $real_script_name;
          fastcgi_param PATH_INFO $path_info;
          include fastcgi_params;
      }
  
      location ~ /\.ht {
          deny all;
      }
  
      location = /favicon.ico {
          log_not_found off;
          access_log off;
      }
  
      location = /robots.txt {
          allow all;
          log_not_found off;
          access_log off;
      }
  
      location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
          expires max;
          log_not_found off;
      }
  
      location /webui {
          proxy_pass http://0.0.0.0:7861/webui/; # and i also try to use http://0.0.0.0:7861/ with no root_path="/webui"
          proxy_buffering off;
          proxy_redirect off;
          proxy_http_version 1.1;
          proxy_set_header Upgrade $http_upgrade;
          proxy_set_header Connection "upgrade";
          proxy_set_header Host $host;
          proxy_set_header X-Forwarded-Host $host;
          proxy_set_header X-Forwarded-Proto $scheme;
      }
  }
  ```
  
  
  ### Screenshot
  
  Gradio is running normally on port 7861, and 7861/webui can also be accessed.
  The following is the situation on localhost:9999:
    The webpage opens up as a blank page.
    However, the returned HTML contains Gradio content.
  
  ![image](https://github.com/user-attachments/assets/f37b63a3-9ad7-48b4-9a23-95e87e3b4dcd)
  
  
  ### Logs
  
  ```shell
  None
  ```
  
  
  ### System Info
  
  ```shell
  Gradio Environment Information:
  ------------------------------
  Operating System: Linux
  gradio version: 5.6.0
  gradio_client version: 1.4.3
  
  ------------------------------------------------
  gradio dependencies in your environment:
  
  aiofiles: 23.2.1
  anyio: 4.3.0
  audioop-lts is not installed.
  fastapi: 0.115.5
  ffmpy: 0.4.0
  gradio-client==1.4.3 is not installed.
  httpx: 0.27.0
  huggingface-hub: 0.26.2
  jinja2: 3.1.3
  markupsafe: 2.1.5
  numpy: 2.1.3
  orjson: 3.10.11
  packaging: 24.0
  pandas: 2.2.3
  pillow: 11.0.0
  pydantic: 2.9.2
  pydub: 0.25.1
  python-multipart==0.0.12 is not installed.
  pyyaml: 6.0.1
  ruff: 0.7.4
  safehttpx: 0.1.1
  semantic-version: 2.10.0
  starlette: 0.41.2
  tomlkit==0.12.0 is not installed.
  typer: 0.13.0
  typing-extensions: 4.11.0
  urllib3: 2.2.1
  uvicorn: 0.32.0
  authlib; extra == 'oauth' is not installed.
  itsdangerous; extra == 'oauth' is not installed.
  
  
  gradio_client dependencies in your environment:
  
  fsspec: 2024.10.0
  httpx: 0.27.0
  huggingface-hub: 0.26.2
  packaging: 24.0
  typing-extensions: 4.11.0
  websockets: 12.0
  ```
  
  
  ### Severity
  
  Blocking usage of gradio