ok

README.md

@@ -4,9 +4,11 @@ emoji: 👁
 colorFrom: blue
 colorTo: blue
 sdk: gradio
+app_file: app.py
+python_version: 3.10
 
 
 pinned: false
 license: mit
 
----
+---

apps/canada_radar_gradio.py

@@ -87,7 +87,10 @@ def fetch_and_recolor(
 
 with gr.Blocks(title="Canada Radar Recolor → US NWS") as demo:
     gr.Markdown("# 🇨🇦→🇺🇸 Radar Recolor (MSC → NWS)")
-    gr.Markdown("Fetch MSC composite, quantize to dBZ, and recolor to NWS scale.")
+    gr.Markdown(
+        "Fetch MSC composite, quantize to dBZ, and recolor to NWS scale.\n"
+        "Note: On Hugging Face Spaces, enable ‘Allow internet’ in the Space Settings to fetch WMS/legend."
+    )
     with gr.Row():
         with gr.Column(scale=1):
             layer = gr.Dropdown(

pydardraw/sources/msc_geomet.py

@@ -9,6 +9,37 @@ from PIL import Image
 
 WMS_URL = "https://geo.weather.gc.ca/geomet"
 
+_DEFAULT_HEADERS = {
+    "User-Agent": "pydardraw/0.1 (+https://huggingface.co/spaces)",
+    "Accept": "image/png,image/*;q=0.9,*/*;q=0.8",
+}
+
+
+def _open_response_image(r: requests.Response) -> Image.Image:
+    """Open a requests response as an image, raising a clear error if not an image.
+
+    This improves diagnostics on Hugging Face Spaces when external internet is
+    disabled or the WMS returns a ServiceException (XML/HTML).
+    """
+    ctype = r.headers.get("Content-Type", "")
+    data = r.content
+    try:
+        img = Image.open(BytesIO(data))
+        img.load()  # validate
+        if img.mode != "RGBA":
+            img = img.convert("RGBA")
+        return img
+    except Exception:
+        try:
+            snippet = r.text[:500]
+        except Exception:
+            snippet = "<binary>"
+        raise ValueError(
+            "WMS did not return an image. "
+            f"Status={r.status_code}, Content-Type={ctype}, URL={r.url}. "
+            f"Body snippet: {snippet!r}"
+        )
+
 
 def fetch_wms_png(
     layer: str,
@@ -38,12 +69,9 @@ def fetch_wms_png(
     }
     if time:
         params["time"] = time
-    r = requests.get(wms_url, params=params, timeout=30)
+    r = requests.get(wms_url, params=params, timeout=30, headers=_DEFAULT_HEADERS)
     r.raise_for_status()
-    img = Image.open(BytesIO(r.content))
-    if img.mode != "RGBA":
-        img = img.convert("RGBA")
-    return img
+    return _open_response_image(r)
 
 
 def fetch_legend_png(
@@ -60,10 +88,6 @@ def fetch_legend_png(
         "format": "image/png",
         "scale": str(scale),
     }
-    r = requests.get(wms_url, params=params, timeout=30)
+    r = requests.get(wms_url, params=params, timeout=30, headers=_DEFAULT_HEADERS)
     r.raise_for_status()
-    img = Image.open(BytesIO(r.content))
-    if img.mode != "RGBA":
-        img = img.convert("RGBA")
-    return img
-
+    return _open_response_image(r)