ProxyPass redirect error on method POST

We ran into an issue with ProxyPass, where the following redirect causes the application to fail when issuing POST. You can see below we got around the issue by using if {[HTTP::method] equals "GET"}. The question is.. would this redirect ever be valid for anything other than GET.

 If you go to http://www.domain.com/dir, and /dir is a directory, the web
 server will redirect you to http://www.domain.com/dir/.  The problem is, with ProxyPass, if the client-side
 path is http://www.domain.com/dir, but the server-side path is http://www.domain.com/, the server will NOT
 redirect the client (it isn't going to redirect you to http://www.domain.com//!).  Here is the problem with
 that.  If there is an image referenced on the page, say logo.jpg, the client doesn't realize /dir is a directory
 and as such it will try to load http://www.domain.com/logo.jpg and not http://www.domain.com/dir/logo.jpg.  So
 ProxyPass has to handle the redirect in this case.  This only really matters if the server-side path is "/",
 but since we have the code here we might as well offload all of the redirects that we can (that is whenever
 the client path is exactly the client path specified in the data group but not "/").
    if {[HTTP::method] equals "GET"} {
if {$orig_uri eq $path_clientside} {
    if {([string index $path_clientside end] ne "/") and not ($path_clientside contains ".") } {
        set is_https 0
        if {[PROFILE::exists clientssl] == 1} {
            set is_https 1
        }
         Assumption here is that the browser is hitting http://host/path which is a virtual path and we need to do the redirect for them
        if {$is_https == 1} {
            HTTP::redirect "https://$orig_host$orig_uri/"
            if { $static::ProxyPassDebug } {
                log local0. "$log_prefix: Redirecting to https://$orig_host$orig_uri/"
            }
        } else {
            HTTP::redirect "http://$orig_host$orig_uri/"
            if { $static::ProxyPassDebug } {
                log local0. "$log_prefix: Redirecting to http://$orig_host$orig_uri/"
            }
        }
        return
    }
}
    }