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Prepopulate Solution Details on Close case page

I have a reqirement where I need to prepopulate the Solution Details (Textarea) when the user clicks on "Close Case" button on Case details page.
I have overriden the Close Case button to show some predefined Solutions . User selects one of the solutions and  clicks on continue button to go to
Close Case. At this moment the "Solution Details" will be prepopulated with the solution that user chose.
I implemented like the following
which is working fine.
Now my question is there a way to avoid to send the message through URL as there is a URL charecter limitation, like submitting with POST method?
I am using ajax9.0
Any help would be greatly appreciated.