https://example.com不向我的负载均衡器发出请求，但http正常工作

这就是我的example.com.conf文件的样子 –

upstream web_app_backend { ip_hash; server <app1 ip>:<port>; server <app2 ip>:<port>; } server { listen 443 ssl; server_name example.com; ssl_certificate /etc/nginx/ssl/example.crt; ssl_certificate_key /etc/nginx/ssl/example.com.key; return 302 http://example.com$request_uri; } server { listen 80; server_name example.com; location / { # First attempt to serve request as file, then # as directory, then fall back to displaying a 404. proxy_pass http://web_app_backend; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto $scheme; proxy_cache_bypass $http_upgrade; } } 

有什么可能会出错？ 当我加载https://example.com ，我没有看到access.log文件和error.log文件中的日志。