Preventing the Cache-Control Response Header from being Set to private

Preventing the Cache-Control Response Header from being Set to private

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Article ID: CTX223856

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Description

Q: When Compression is enabled on a NetScaler appliance, can you prevent the Cache-Control response header being set to the value private?

A: Yes. You can prevent the Cache-Control response from being set to the value private when compression is enabled on a NetScaler appliance. To prevent the Cache-Control response header being set to the value private in a response from the NetScaler appliance, you can perform any one of the following tasks:

  • Prevent adding the Cache-Control response header
    Run the following command from the shell prompt to prevent adding the Cache-Control response header:
    # nsapimgr -ys cmp_no_cc_hdr=1

    Note    : Preventing addition of the Cache-Control response header is a global setting.

    To ensure that this command persists even after the appliance is restarted, you can add the preceding command to the /nsconfig/rc.netscaler file. To add the command to the rc.netscaler file, run the following command from the shell prompt:
    echo nsapimgr -ys cmp_no_cc_hdr=1 >> /nsconfig/rc.netscaler
      • Add a Vary header
        Run the following command from the shell prompt to add a Vary header:
        #nsapimgr -ys add_vary_header=1

        To ensure that this command persists even after the appliance is restarted, you can add the preceding command to the /nsconfig/rc.netscaler file. To add the command to the rc.netscaler file, run the following command from the shell prompt::
        #echo nsapimgr -ys add_vary_header=1 >> /nsconfig/rc.netscaler
          • Avoid compression
            To avoid compression, configure a NOCOMPRESS policy for a specific response that does not require the Cache-Control response header to be set to private or disable the Compression on the NetScaler appliance.

              More Information

              Setting the Cache-Control response header as private, such as Cache-Control: private, indicates that all or part of the response message is intended for a single user. It also indicates that the content must not be cached by a shared cache. This setting allows an origin server to state that the specified part of the response is intended only for one user and is not a valid response for requests sent by other users. A private, non-shared cache might cache the response.

              The Vary field value indicates the set of request-header fields that completely determine whether a cache is permitted to be used as a response to a subsequent request without revalidation, while the response is fresh.

              Additional Information

              http://support.ctx.org.cn/ctx124717.citrix
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