Attempt to embed as iframe

app.py

@@ -23,7 +23,7 @@ except FileNotFoundError:
 
 s = requests.Session()
 s.headers.update({
-    "User-Agent": "Twitterbot/1.0"
+    "User-Agent": "Googlebot/2.1"
 })
 s.cookies = cookie_jar  # type: ignore
 
@@ -64,8 +64,13 @@ def proxy(video_id):
 
     og_tags = soup.find_all("meta", property=lambda x: x)  # type: ignore
     for tag in og_tags:
+        # Fix thumbnail
         if tag.get("property") == "og:image" and thumbnail_url:
             tag["content"] = thumbnail_url
+            break
+        # Fix embed (Niconico doesn't return MP4s)
+        if tag.get("property") == "og:video:type":
+            tag["content"] = "text/html"
 
     og_tags_str = "\n".join(str(tag) for tag in og_tags)
     html_response = f"""