diff --git a/app.py b/app.py
index 94793ad..4161969 100644
--- a/app.py
+++ b/app.py
@@ -1,3 +1,4 @@
+import os
 import http.cookiejar
 import json
 import requests
@@ -13,7 +14,7 @@ app = Flask(__name__)
 
 CACHE_EXPIRATION_SECONDS = 3600  # 1 hour
 CACHE_SIZE_LIMIT = 100 * 1024 * 1024  # 100 MB
-cache = Cache("disk_cache", size_limit=CACHE_SIZE_LIMIT)
+cache = None if os.environ.get('NICONICOGAY_DISABLE_CACHE', '') != '' else Cache("disk_cache", size_limit=CACHE_SIZE_LIMIT)
 
 cookie_jar = http.cookiejar.MozillaCookieJar('cookies.txt')
 try:
@@ -31,10 +32,11 @@ s.cookies = cookie_jar  # type: ignore
 def proxy(video_id):
     logger.info(f"Received request for video ID: {video_id}")
 
-    cached_html = cache.get(video_id)
-    if cached_html is not None:
-        logger.info(f"Using cached response for video ID: {video_id}")
-        return Response(cached_html, mimetype="text/html")  # type: ignore
+    if cache:
+        cached_html = cache.get(video_id)
+        if cached_html is not None:
+            logger.info(f"Using cached response for video ID: {video_id}")
+            return Response(cached_html, mimetype="text/html")  # type: ignore
 
     # Not in cache or cache expired; fetch from nicovideo.jp
     real_url = f"https://www.nicovideo.jp/watch/{video_id}"
@@ -67,14 +69,6 @@ def proxy(video_id):
         # Fix thumbnail
         if tag.get("property") == "og:image" and thumbnail_url:
             tag["content"] = thumbnail_url
-            break
-
-    og_tags.remove(soup.find("meta", property="og:video:type"))
-    og_tags.append(soup.new_tag("meta", property="og:video:type", content="text/html"))
-    og_tags.append(soup.new_tag("meta", property="twitter:card", content="player"))
-    og_tags.append(soup.new_tag("meta", property="twitter:image", content="0"))
-    og_tags.append(soup.new_tag("meta", property="twitter:player:stream:content_type", content="text/html"))
-    og_tags.append(soup.new_tag("meta", property="theme-color", content="#f7f7f7"))
 
     og_tags_str = "\n".join(str(tag) for tag in og_tags)
     html_response = f"""
@@ -89,7 +83,8 @@ def proxy(video_id):
         </html>
     """
 
-    logging.info(f"Caching response for video ID: {video_id}")
-    cache.set(video_id, html_response, expire=CACHE_EXPIRATION_SECONDS)
+    if cache:
+        logging.info(f"Caching response for video ID: {video_id}")
+        cache.set(video_id, html_response, expire=CACHE_EXPIRATION_SECONDS)
 
     return Response(html_response, mimetype="text/html")