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Editorial Team
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Asked: 2026-05-26T22:31:16+00:00

<VirtualHost *:80> ServerAdmin webmaster@dev.dom.com DocumentRoot C:/Program Files/Apache Software Foundation/Apache2.2/htdocs ServerName dev.dom.com ServerAlias dev.dom.com ErrorLog

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<VirtualHost *:80>
    ServerAdmin webmaster@dev.dom.com
    DocumentRoot "C:/Program Files/Apache Software Foundation/Apache2.2/htdocs"
    ServerName dev.dom.com
    ServerAlias dev.dom.com
    ErrorLog "logs/dev.dom.com-error.log"
    CustomLog "logs/dev.dom.com-access.log" common
    PassEnv CLUSTER
    Header always set X-Cluster "%{CLUSTER}e"
</VirtualHost>

Here is my configuration. I have an environment variable which tells me what cluster I am on, which is passed as a header in ‘X-Cluster’. This returns fine on a 200 or a 404 response, but a 304 Not Modified response never returns the header, even though it returns other appropriate Apache headers.

How do I get the header to be set during a 304 response?

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1 Answer

  1. Editorial Team

    Apache explicitly prohibits modifying the response headers in a 304 response for compliance with the http spec. The name of this type of response is “Not modified”. You can modify this behavior using Apache’s filter architecture, by writing a custom module, or with mod_perl perhaps, but it’s most likely the wrong thing to do.

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