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<TITLE>Special Purpose Environment Variables</TITLE>
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<h1>Special Purpose Environment Variables</h1>
<P>Interoperability problems have led to the introduction of
mechanisms to modify the way Apache behaves when talking to particular
clients. To make these mechanisms as flexible as possible, they
are invoked by defining environment variables, typically with
<A HREF="mod/mod_browser.html#browsermatch">BrowserMatch</A>, though
<A HREF="mod/mod_env.html#setenv">SetEnv</A> and
<A HREF="mod/mod_env.html#passenv">PassEnv</A> could also be used, for
example.</P>

<H2>nokeepalive</H2>
This disables <A HREF="mod/core.html#keepalive">KeepAlive</A> when set. Because
of problems with Netscape 2.x and KeepAlive, we recommend the following
directive be used:
<BLOCKQUOTE><CODE>
BrowserMatch Mozilla/2 nokeepalive
</CODE></BLOCKQUOTE>
<H2>force-response-1.0</H2>
This forces an HTTP/1.0 response when set. It was originally implemented as a
result of a problem with AOL's proxies. Some clients may not behave correctly
when given an HTTP/1.1 response, and this can be used to interoperate with
them.

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