postinst is in php-pecl-http 3.0.1-0ubuntu5.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18  | #!/bin/sh
set -e
# Automatically added by dh_php
for conf in pecl-http; do
    dpkg-maintscript-helper rm_conffile /etc/php/mods-available/${conf}.ini -- "$@"
done
if [ -e /usr/lib/php/php-maintscript-helper ] ; then
    . /usr/lib/php/php-maintscript-helper
    for conf in pecl-http ; do
        php_invoke enmod ALL ALL $conf || exit $?
    done
else
    for conf in pecl-http ; do
        phpenmod $conf
    done
fi
# End automatically added section
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