@ionutionita92 - sip parsing is no longer something very expensive, if can be avoided, it
is good of course. Eventually, it can be made a modparam to control if one wants to do it
at that stage or not. Sometimes is better to have the option of enabling a feature at the
expense of some processing time, given these days horizontal scalability can be done quite
easily with cloud or containers.
I am not sure what are the headers you are looking for, but tm has some lightweight
parsing option for few headers, iirc, they are used to match quickly the replies, or maybe
something else, need to look into the code for exact answer here ... anyhow, we can move
them in the core if they are useful somewhere else.
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