diff --git a/server.py b/server.py
index 64d34a9..b2850e6 100644
--- a/server.py
+++ b/server.py
@@ -219,6 +219,7 @@ class Handler(http.server.BaseHTTPRequestHandler):
 
             self.send_response(200)
             self.send_header("Content-Type", f"{content_type}; charset=utf-8")
+            self.send_header("Content-Length", str(len(content)))
             self.send_header("Access-Control-Allow-Origin", "*")
             self.send_header("Cache-Control", "no-cache")
             self.end_headers()