Enable Passthrough for file downloads

I have an issue where I am loadbalancing a document management system which works fine until I try to download files from the website of a particular type. The files fail to download because they the file size is larger than the reported content length. I have tried to use HTTP::disable to enable passthrough and prevent the F5 from enforcing the content length. When I do this the browser pops up with a logon window. Is there a way to prevent this from happening?

 

when HTTP_REQUEST priority 100 {

 

Selectively disable HTTP parser for specific URIs

 

switch -glob [string tolower [HTTP::uri]] {

 

/action=download {

 

HTTP::disable

 

log local0. "Disabling http profile" Disable HTTP_REQUEST event for this connection

 

so that other iRules cannot not call HTTP parser event disable

 

}

 

} }