How to display a page in an iframe, requesting it by a special `url` and sending parameters using the` POST` method?

1. Make an intermediate page, the path to it and insert it into the src frame
2. On the page itself, we do a post request with a script, for example

 $.post('test.html', function(data) { $('body').html(data); }); 

Naturally for this by connecting to the intermediate page jquery

UPD: Better yet, put a form with hidden fields for the parameters on the page and send it with a script. Then the content will not be loaded by the Ajax and there will be no problems with the work of the scripts on the final page, plus you do not need to connect jquery

 <form action='test.html'> <input type='hidden' name='param1' value='123'/> </form> <script> document.forms[0].submit() </script>