Ajax form submit best pratices?

[eluser]Krzemo[/eluser]
Hi,

Im working on a form contents of which are to be saved into DB via Ajax request.
One of the fields is textarea and might contain relatively long text along with some characters that supposingly might not be allowed in URI by default and characters like lf or rf.
Ajax request will look more less like that:
http://localhost/applicaiton/controller/...eld2value/ ...

Is it generally acceptable aproach? Or should (must) work on different solution?

Thnx