Hello Ernest,
I have tried with both GET and POST methods enabled and it still shows /?post_type=product&s=xxxx in the text with POST enabled and /?post_type=product&s=82-9222&asp_active=1&p_asid=1&p_asp_data=Y3VycmVudF9wYWdlX2lkPTE5NzkyJndvb19jdXJyZW5jeT1 when GET is enabled. Both show POST in the url. When I disable your plugin and run the same search it shows /?s=82-922&post_type=product
when I have GET Enabled, it still give a Expired document warning when you search something and then press back on search.
So, no matter what option is enabled it still shows post. I have cleared cache and reset the browsers. The website works like it is supposed to with the plugin disabled.
Can I send you a testing login to checkout what is going on? If you dont mind?
Let me know the best way to send you the login information and I will get that to you.
Please let me know if there are any questions.
Thanks,
Chris