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WAF: How to pass content-length header to client?

Hi!

I've noticed that WAF seems to remove the "content-length" header from the HTTP-Headers of my IIS8.5. Therefore, if I'm trying to download a file from my webserver, the client can't determine the file size and is just downloading "until it's finished". This of course also breaks any kind of "resume" features.

I've already tried to disable any kind of intrustion detection for my firewall rule but the header is still missing:

Status: HTTP/1.1 200 OK
Date: Fri, 07 Oct 2016 13:59:25 GMT  
Server: Apache  
Content-Type: application/x-zip-compressed  
Last-Modified: Mon, 11 Jul 2016 17:04:06 GMT  
Accept-Ranges: bytes  
ETag: "d5c203c96dbd11:0-gzip"  
X-Powered-By: ASP.NET  
Vary: Accept-Encoding  
Content-Encoding: gzip  
Connection: close  
Transfer-Encoding: chunked  


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