GET or POST method?

Hi,

I have to decide which form-method I should use (GET or POST). I found
the following recomendation:
If the service associated with the processing of a form has side
effects (for example, modification of a database or subscription to a
service), the method should be POST. (http://www.cs.tut.fi/~jkorpela/
forms/methods.html).

However, later I did not find any convinced arguments why it should
help (it can be that I just did not understand something).

So, I have decided not to go into the details of GET and POST methods
and just use POST. Is here any significant difference between GET and
POST which I should worry about (like security issues or something
else)? Or it is just question of convenience?

.

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