Toggle fix at runtime on stock gradio

app.py

@@ -2,10 +2,48 @@ import os
 
 import gradio as gr
 import httpx
+from gradio import route_utils
+from gradio_client import utils as client_utils
 
 PHOTO = "https://raw.githubusercontent.com/gradio-app/gradio/main/test/test_files/cheetah1.jpg"
+BUS = "https://raw.githubusercontent.com/gradio-app/gradio/main/test/test_files/bus.png"
 PORT = int(os.environ.get("GRADIO_SERVER_PORT", 7860))
-EXAMPLE_PAYLOAD = "https://raw.githubusercontent.com/gradio-app/gradio/main/test/test_files/bus.png"
+APPLY_FIX = os.environ.get("APPLY_FIX", "").lower() in ("1", "true", "yes")
+ROOT = (
+    f"https://{os.environ['SPACE_HOST']}"
+    if os.environ.get("SPACE_HOST")
+    else f"http://127.0.0.1:{PORT}"
+)
+
+
+def patched_update_example_values(api_info, root_url=ROOT):
+    """gradio/route_utils.py with the root url actually supplied."""
+
+    def _add_root_url(file_dict):
+        default_value = file_dict.get("parameter_default")
+        if default_value is not None and client_utils.is_file_obj_with_url(
+            default_value
+        ):
+            url = default_value["url"]
+            if client_utils.is_http_url_like(url):
+                return file_dict
+            if root_url and url:
+                default_value["url"] = f"{root_url.rstrip('/')}/{url.lstrip('/')}"
+                return file_dict
+            example_input = file_dict.get("example_input")
+            if isinstance(example_input, dict) and "url" in example_input:
+                default_value["url"] = example_input["url"]
+        return file_dict
+
+    return client_utils.traverse(
+        api_info,
+        _add_root_url,
+        lambda d: isinstance(d, dict) and "parameter_default" in d,
+    )
+
+
+if APPLY_FIX:
+    route_utils.update_example_values_to_use_public_url = patched_update_example_values
 
 
 def describe(photo):
@@ -13,42 +51,46 @@ def describe(photo):
 
 
 def advertised_default():
-    """What /info tells an API client this endpoint's default photo is."""
     info = httpx.get(f"http://127.0.0.1:{PORT}/gradio_api/info", timeout=30).json()
     default = info["named_endpoints"]["/describe"]["parameters"][0]["parameter_default"]
     url = default.get("url") or ""
 
-    broken = url == EXAMPLE_PAYLOAD
-    verdict = (
-        "### ❌ Broken\n`/info` advertises a **bus** — `Image.example_payload()` "
-        "standing in for your default. A client calling `/describe` without the "
-        "`photo` argument fetches the wrong file."
-        if broken
-        else "### ✅ Fixed\n`/info` advertises the **cheetah** this app actually "
-        "serves, at an absolute url the client can fetch."
-    )
-    report = (
-        f"{verdict}\n\n"
-        f"| | |\n|---|---|\n"
+    if url == BUS:
+        verdict = (
+            "### ❌ Broken\n`/info` advertises a **bus** — `Image.example_payload()` "
+            "standing in for the default. A client calling `/describe` without the "
+            "`photo` argument fetches the wrong file."
+        )
+    else:
+        verdict = (
+            "### ✅ Fixed\n`/info` advertises the **cheetah** this app really serves, "
+            "at an absolute url the client can fetch."
+        )
+    return url, (
+        f"{verdict}\n\n| | |\n|---|---|\n"
         f"| gradio | `{gr.__version__}` |\n"
-        f"| `orig_name` | `{default.get('orig_name')}` |\n"
+        f"| fix applied | `{APPLY_FIX}` |\n"
         f"| `url` | `{url}` |\n"
     )
-    return url, report
 
 
-with gr.Blocks(title="Default file url bug") as demo:
+with gr.Blocks(title="Default file url") as demo:
     gr.Markdown(
         "# The default file a client actually gets\n"
-        "This app's `photo` parameter has a default. Below is the image that "
-        "default resolves to **for an API caller reading `/info`** — which should "
-        "be the same cheetah the app itself uses."
+        "This app's `photo` parameter has a default. On the right is the image "
+        "that default resolves to **for an API caller reading `/info`** — which "
+        "should be the same cheetah."
     )
     with gr.Row():
-        photo = gr.Image(label="The app's default (what you see)", value=PHOTO, type="filepath")
-        served = gr.Image(label="What /info advertises (what a client gets)")
+        photo = gr.Image(
+            label="The app's default (what you see)", value=PHOTO,
+            type="filepath", height=320,
+        )
+        served = gr.Image(
+            label="What /info advertises (what a client gets)", height=320,
+        )
     report = gr.Markdown()
-    path_out = gr.Textbox(label="Resolved path", visible=False)
+    path_out = gr.Textbox(visible=False)
 
     gr.Button("Describe", visible=False).click(
         describe, photo, path_out, api_name="describe"