httpPaths: add trailing slash to proxy_pass

http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass

"If the proxy_pass directive is specified with a URI, then when a request
is passed to the server, the part of a normalized request URI matching the
location is replaced by a URI specified in the directive"

src/nginxconfig.ejs

@@ -254,7 +254,8 @@ server {
 
     <% Object.keys(httpPaths).forEach(function (path) { -%>
         location "<%= path %>" {
-            proxy_pass http://<%= ip %>:<%= httpPaths[path] %>;
+            # the trailing / will replace part of the original URI matched by the location.
+            proxy_pass http://<%= ip %>:<%= httpPaths[path] %>/;
         }
     <% }); %>