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BeetleJuice
Asked: 2016-09-15 15:08:46 +0800 CST

Determine HTTPS status and set Header in a single line

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I wish to set a response header in .htaccess but only when the site is loaded over HTTPS:

Header set MyHeader "%D %t" "%{HTTPS:on}"
# Error: Unknown parameter: %{HTTPS:on}

Header set MyHeader "%D %t" "expr=%{HTTPS:on}"
# Error: syntax error, unexpected $end: Function 'HTTPS' does not exist

Header set MyHeader "%D %t" "expr=%{HTTPS}==on"    
# Error: syntax error, unexpected $end, expecting '('

HTTPS is listed as a variable here

PS: I'm having a really hard time understanding how Apache expressions work so if anyone has come across a simple introduction with good examples, please share.

.htaccess apache-2.4 http-headers

1 Answers

  1. Use an <If> clause, it should work in .htaccess:

    <If "%{HTTPS} == 'on'">
    Header set MyHeader "%D %t"
</If>

    Reference:
    http://httpd.apache.org/docs/2.4/mod/core.html#if

    • 2