Issue 4068 - Redirect tailing-dot hostname requests to use canonical domain name

modules/nginx/templates/site.erb

Index: modules/nginx/templates/site.erb
diff --git a/modules/nginx/templates/site.erb b/modules/nginx/templates/site.erb
index ff866502916599c6e7d54aab751ee0ebbd65fbdd..6cd83376db922373162a0cabe31b1f353f40599d 100644
--- a/modules/nginx/templates/site.erb
+++ b/modules/nginx/templates/site.erb
@@ -71,6 +71,10 @@ location = /50x.html
   root /usr/share/nginx/html;
 }
 
+if ($http_host ~ "\.$") {

[Wladimir Palant, 2016/05/24 19:08:07]

Nit: The opening bracket belong on the next line.

+  rewrite ^(.*) $scheme://$host$1 permanent;

[Wladimir Palant, 2016/05/24 19:08:07]

This relies on undocumented behavior, namely $host being identical to $http_host
but with the trailing dot removed. At the very least you should link to
https://www.ruby-forum.com/topic/163942#719893 which seems to be your source for
this information (via Stack Overflow). A better option might be avoiding
undocumented behavior altogether:

  if ($http_host ~ "^(.*)\.$")
  {
    set $host_without_trailing_dot $1;
    rewrite ^(.*) $scheme://$host_without_trailing_dot$1 permanent;
  }

+}
+
 <% if @content %>
   <%= content %>
 <% end %>