nginx1.15.10配置使用非https访问返回403

nginx版本号：nginx version: nginx/1.15.10

server {
listen 443 default ssl;
server_name app.test.com;
if ($host != 'app.test.com'){
return 403;
}
ssl_certificate /usr/local/nginx/ssl/app.test.com.crt;
ssl_certificate_key /usr/local/nginx/ssl/app.test.com.key;
ssl_session_timeout 5m;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
access_log logs/host.access.log;
location / {
proxy_pass http://127.0.0.1;
}
}