add nginx reverse proxy examples

examples/nginx-contextpath/nginx.conf

@@ -0,0 +1,48 @@
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+include /etc/nginx/modules-enabled/*.conf;
+
+events {
+    worker_connections  1024;
+}
+
+http {
+
+    server {
+        listen          80;
+        server_name     localhost;
+
+        # PlantUML
+        location /plantuml/ {
+            proxy_set_header  HOST               $host;
+            proxy_set_header  X-Forwarded-Host   $host;
+            proxy_set_header  X-Forwarded-Proto  $scheme;
+
+            proxy_pass http://plantuml-server:8080/plantuml/;
+        }
+    }
+
+    client_max_body_size    0;
+
+    include /etc/nginx/mime.types;
+    default_type application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    #tcp_nopush     on;
+
+    keepalive_timeout  65;
+
+    #gzip  on;
+
+    include /etc/nginx/conf.d/*.conf;
+}