switch to coreos bbolt

nginx-proxy-example.conf

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+# example of nginx proxy to use with nginx-le - https://github.com/umputun/nginx-le
+
+server {
+    listen   443;
+    server_name demo.remark42.com;
+
+    ssl    on;
+    ssl_certificate        SSL_CERT;
+    ssl_certificate_key    SSL_KEY;
+    ssl_trusted_certificate SSL_CHAIN_CERT;
+
+    add_header Strict-Transport-Security "max-age=63072000; includeSubdomains; preload";
+
+    limit_conn perip 10;
+
+    location / {
+
+        #CORS
+        add_header 'Access-Control-Allow-Origin' '*';
+        add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, OPTIONS';
+        add_header Access-Control-Allow-Headers "Content-Type, Authorization, X-Requested-With";
+        if ($request_method = 'OPTIONS') {
+             add_header 'Access-Control-Allow-Origin' '*';
+             add_header 'Access-Control-Allow-Methods' 'GET, PUT, POST, DELETE, OPTIONS';
+             add_header 'Access-Control-Max-Age'        86400;
+             add_header 'Access-Control-Allow-Credentials' 'true';
+             add_header 'Access-Control-Allow-Headers' 'Authorization,DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type';
+             add_header 'Content-Length' 0;
+             add_header 'Content-Type' 'text/plain; charset=UTF-8';
+             return 204;
+         }
+
+         proxy_redirect          off;
+         proxy_set_header        X-Real-IP $remote_addr;
+         proxy_set_header        X-Forwarded-For $proxy_add_x_forwarded_for;
+         proxy_set_header        Host $http_host;
+         proxy_pass              http://remark:8080/;
+     }
+}