We are facing an issue where the first API call in our React Native app takes 45-60 seconds due to a slow SSL handshake. After the initial request, subsequent API calls work fine.
Our setup is as follows:
- Backend: Tomcat (Serving APIs)
- Reverse Proxy: Nginx (Handles SSL termination)
- Mobile App: React Native (Using Redux Toolkit Query for API calls)
- SSL Certificate: Let's Encrypt (Installed on Nginx)
Issue:
Whenever a user opens the app for the first time, the initial API request triggers an SSL handshake delay of 45-60 seconds. This happens only on the first request, and subsequent requests are fast.
What We Have Tried:
Enabled SSL Session Resumption in Nginx (ssl_session_cache)
ssl_session_cache shared:SSL:50m; ssl_session_timeout 4h; ssl_session_tickets on; keepalive_timeout 75s; keepalive_requests 100;Result: No major improvement.
Preloaded API Calls in React Native (useEffect)
useEffect(() => { triggerGetData(); // Preload API call to warm up SSL connection }, []);Result: Helped slightly, but still slow for first-time users.
Enabled HTTP/2 in Nginx
listen 443 ssl http2;Result: No noticeable improvement.
Checked SSL Handshake Timing Using OpenSSL
openssl s_client -connect yourdomain:443 -showcerts -timeResult: Handshake took ~15 sec on first request but was fast on retries.`
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