Nginx Reverse Proxy Lowercase URL and some exceptions to the URL

[Alex Med]

Dear Francis:

Here are the answers to your questions.  Thank YOU for helping!

The location block are in the following order:

Location #1
location ~
^/(api|contentAsset|categoriesServlet|DotAjaxDirector|html|dwr|dA)/ {}

Location #2 ----> This location does the lowercasing
location ~ [A-Z] { return 301 $scheme://$host$my_uri_to_lowercase;}

Location #3
location /{}

Everything is lowercased.  So I want some paths to be untouched. So I
created location #1 to exclude some paths from lowercasing.  The problem is
that 
in some URLs containing the paths above are lowercased.  For example:
/dwr/interface/CategoryAjax.js, /dwr/interface/HostAjax.js are lowercased.
Also, /html/images/languages/gh_TW.gif

Any help will be appreciated!



Note: The function definition for $my_uri_to_lowercase is inside my http
definition, here is a copy of it:
  ##
        ## URL REWRITE FUNCTION:  LOWERCASE ALL URIs
        ## START

        perl_set $my_uri_to_lowercase 'sub {
         my $r = shift;
         my $uri = $r->uri;
         $uri = lc($uri);
         return $uri;
         }';

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,285780,285782#msg-285782