added cache for sunbirdigot read

kubernetes/helm_charts/core/nginx-public-ingress/values.j2

@@ -493,6 +493,34 @@ proxyconfig: |-
       proxy_pass http://ui-proxies:3003;
     }
 
+    # This is Caching mechanism for r search
+    location ~ /apis/proxies/v8/sunbirdigot/read {
+      # Enabling caching
+      proxy_cache_key "$request_uri|$request_body";
+      proxy_cache content_cache;
+      add_header X-Proxy-Cache $upstream_cache_status;
+      add_header X-Proxy-Cache-Date $upstream_http_date;
+      proxy_cache_use_stale error timeout updating http_500 http_502 http_503 http_504;
+      proxy_cache_methods POST;
+      proxy_cache_revalidate on;
+      proxy_cache_background_update on;
+      proxy_cache_lock on;
+      proxy_cache_valid 200 14400s;
+      # Increasing the proxy buffer size
+      proxy_buffer_size 16k;
+      proxy_busy_buffers_size 16k;
+      rewrite ^/apis/(.*) /$1 break;
+      proxy_set_header Connection "";
+      proxy_set_header Host $host;
+      proxy_set_header X-Scheme $scheme;
+      proxy_set_header X-Real-IP {{ nginx_client_public_ip_header | d('$remote_addr') }};
+      proxy_connect_timeout 5;
+      proxy_send_timeout 60;
+      proxy_read_timeout 70;
+      proxy_http_version 1.1;
+      proxy_pass http://ui-proxies:3003;
+    }
+
     location /protected/v8/resource/ {
       if ($request_method = OPTIONS ) {
               add_header Access-Control-Allow-Origin "*" ;