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Last-Modified Header missing


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Hi,

 

i have a NSMPX-8000 Netscaler ADC (Firmware Release NS12.1 50.28.nc). Pimarily used for loadbalancing http traffic.

I can`t figure out why, but in some circumstances the Netscaler delete the Last-Modyfied header from the Origin-Servers response header... all other respone headers seems to be untouched?!

 

I know that the Netscaler maniulate the respons header if a Application-Firewall is active and bound to a Content Switching Virtual Server (https://support.citrix.com/article/CTX131488). We have no AppFW Configurations active or bound so this should not be the reason. (there is also no X-Cache-Control-orig header which is insert if the AppFW is active)

 

In some cases we make a "URL Transformation" (rewrite) to transform the request header to another URL. but we do not manipulate the response request.  unfortunately i can't find any note or documentation that the URL Transformation will manipulate any HTTP headers. is this right?

 

Can somebody help an tell me what the reason of this can be? or give me a hint?

 

 

EDIT:

ok, i can now verify that the transform policy cause the problem... on a test Content Switching Virtual Server i got...

 

with transform policy

Accept-Ranges: bytes
Access-Control-Allow-Headers: content-type, x-pjax, x-pjax-container
Access-Control-Allow-Methods: GET,POST,OPTIONS
Age: 4
Cache-Control: public, max-age=3716, s-maxage=3716
Connection: keep-alive
Content-Language: de-DE
Content-Type: text/html;charset=UTF-8
Date: Fri, 30 Aug 2019 13:39:49 GMT
Expires: Fri, 30 Aug 2019 14:41:49 GMT
Server: sophora-delivery
Transfer-Encoding: chunked
X-Cache: HIT
X-Hits: 1

 

without transform policy

Accept-Ranges: bytes
Access-Control-Allow-Headers: content-type, x-pjax, x-pjax-container
Access-Control-Allow-Methods: GET,POST,OPTIONS
Age: 32
Cache-Control: public, max-age=3688, s-maxage=3688
Connection: keep-alive
Content-Language: de-DE
Content-Type: text/html;charset=UTF-8
Date: Fri, 30 Aug 2019 13:41:32 GMT
Expires: Fri, 30 Aug 2019 14:43:32 GMT
Last-Modified: Fri, 30 Aug 2019 13:41:32 GMT
Server: sophora-delivery
Transfer-Encoding: chunked
X-Cache: HIT
X-Hits: 1

 

any sugestions?

 

 

 

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