Add queueing on webserver level

Author: JoeriHermans

nginx.conf

@@ -18,6 +18,8 @@ http {
     gzip_min_length 256;
     gzip_comp_level 6;
 
+    limit_req_zone $server_name zone=peppol_ratelimit:10m rate=4r/s;
+
     server {
         listen 8000;
 
@@ -53,6 +55,7 @@ http {
         proxy_cache_bypass $http_pragma; # Allow manual bypass for debugging
 
         location / {
+            limit_req zone=peppol_ratelimit burst=128; # This will queue 128 requests.
             proxy_pass https://directory.peppol.eu/search/1.0/json;
             add_header X-Cache-Status $upstream_cache_status;
             add_header X-Cache-Key $normalized_cache_key;