gradio6: harden app launch for Spaces runtime

app.py

@@ -6,6 +6,7 @@ Auth is optional and controlled via environment variables.
 """
 from __future__ import annotations
 
+import inspect
 import os
 from pathlib import Path
 from typing import List, Tuple
@@ -41,31 +42,51 @@ def build_auth() -> List[Tuple[str, str]] | None:
     return auth_list or None
 
 
-def build_demo(html: str, auth: List[Tuple[str, str]] | None) -> gr.Blocks:
+def build_demo(html: str) -> gr.Blocks:
     escaped = py_html.escape(html, quote=True)
     iframe = (
         "<iframe id='tester-frame' title='LibraxisAI Responses API Tester' "
         "style=\"width:100%;height:90vh;border:none;background:#0b0b0c;\" "
         f"srcdoc=\"{escaped}\"></iframe>"
     )
-    with gr.Blocks(title="LibraxisAI API Batch Tester", css="body{background:#0b0b0c;}") as demo:
+    with gr.Blocks(title="LibraxisAI API Batch Tester") as demo:
         gr.HTML(iframe)
-    port = int(os.getenv("PORT", os.getenv("GRADIO_PORT", "7860")))
-    demo.launch(
-        server_name="0.0.0.0",
-        server_port=port,
-        auth=auth,
-        show_api=False,
-        inline=False,
-        max_threads=8,
-    )
     return demo
 
 
+def launch_demo(demo: gr.Blocks, auth: List[Tuple[str, str]] | None) -> None:
+    port = int(os.getenv("PORT", os.getenv("GRADIO_PORT", "7860")))
+    raw_kwargs = {
+        "server_name": "0.0.0.0",
+        "server_port": port,
+        "max_threads": 8,
+        "css": "body{background:#0b0b0c;}",
+    }
+    if auth:
+        raw_kwargs["auth"] = auth
+
+    launch_signature = inspect.signature(demo.launch).parameters
+    launch_kwargs = {k: v for k, v in raw_kwargs.items() if k in launch_signature}
+
+    if "footer_links" in launch_signature:
+        # Replacement for show_api=False in newer Gradio versions.
+        launch_kwargs["footer_links"] = ["gradio", "settings"]
+    elif "show_api" in launch_signature:
+        launch_kwargs["show_api"] = False
+
+    if "inline" in launch_signature:
+        launch_kwargs["inline"] = False
+
+    demo.launch(**launch_kwargs)
+
+
 def main() -> None:
-    html = load_html()
-    auth = build_auth()
-    build_demo(html, auth)
+    launch_demo(demo, AUTH)
+
+
+HTML = load_html()
+AUTH = build_auth()
+demo = build_demo(HTML)
 
 
 if __name__ == "__main__":