Catch URL errors in resize

jarvis/cogs/image.py

@@ -94,9 +94,20 @@ class ImageCog(Scale):
             filename = url.split("/")[-1]
 
         data = None
+        try:
             async with self._session.get(url) as resp:
-            if resp.status == 200:
+                resp.raise_for_status()
+                if resp.content_type in ["image/jpeg", "image/png"]:
                     data = await resp.read()
+                else:
+                    await ctx.send(
+                        "Unsupported content type. Please send a URL to a JPEG or PNG",
+                        ephemeral=True,
+                    )
+                    return
+        except Exception:
+            await ctx.send("Failed to retrieve image. Please verify url", ephemeral=True)
+            return
 
         size = len(data)
         if size <= tgt_size: