nginx: Support query params & fix OPCS-4 port conflict (#35)

* Include query params when passing to upstream
* Use new port for OPCS-4 to avoid ICD-10 conflict

Signed-off-by: Phoevos Kalemkeris <phoevos.kalemkeris@ucl.ac.uk>

Author: phoevos

docker/nginx/etc/nginx/nginx.conf

@@ -48,6 +48,14 @@ http {
             include cors.conf;
             resolver 127.0.0.11 valid=30s;
             set $upstream $service:8000;
+            set $path $subpath;
+            if ($subpath = "") {
+                set $path /;
+            }
+            set $query_string_part "";
+            if ($is_args) {
+                set $query_string_part $is_args$args;
+            }
 
             # FIXME: Access web interfaces (e.g. Grafana, MLflow) through subpaths on the proxy.
             # The following services only work when accessed directly through their respective APIs.
@@ -76,7 +84,7 @@ http {
                 set $upstream $service:9090;
             }
 
-            proxy_pass http://$upstream$subpath;
+            proxy_pass http://$upstream$path$query_string_part;
 
             proxy_redirect http://$upstream$subpath $scheme://$host/cms/$service$subpath;
             proxy_redirect http://$upstream/ $scheme://$host/cms/$service/;

docker/nginx/etc/nginx/sites-enabled/medcat-opcs4

@@ -1,6 +1,6 @@
 server {
-    listen                    28181 ssl http2 default_server;
-    listen                    [::]:28181 ssl http2 default_server;
+    listen                    28182 ssl http2 default_server;
+    listen                    [::]:28182 ssl http2 default_server;
     server_name               localhost;
 
     add_header                Strict-Transport-Security "max-age=31536000" always;