#18 Calling a function only once when the module get loaded

[Anonymous]

I want to call my function when the module gets loaded.
I called that fuction from mod_gzip_init, but it is getting
called twice.
Please let me know how can I accomplish this?

[Michael Schröpl]

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I don't think you can do that so easily.

mod_gzip is being called twice by the Apache request
handlng, first during the request analysis phase and second
after the content to be sent has already been created.
Therefore mod_gzip does its item_rule checking twice (which
is the reason why you have to configure it as to fire an
"include" rule in each of these two passes).

So if you call a function from the mod_gzip source then your
function will be called twice because mod_gzip itself will
be calle twice. To prevent this you would have to store
information about whether you are in the first or second
invocation; perhaps you might use the "notes" concept in
Apache (which mod_gzip uses to store information about the
compression result). In this case you might check the
existance of the note before your function's invocation and
create the nore afterwards, thus enforcing your function to
be called in "phase 1" only - if that's what you want. Or if
you want to be called in phase 2 only you just complement
the check, so that your function will be invoked only when
the note has already been set.