Passing Complete Landing Page URL String With Parameters in ONE Field

We would like to pas capture and pass through the entire landing page URL complete with all params as one field.

I realize it’s easy to send the landing page URL, and that it is also easy to pass through individual parameters using hidden fields, but that doesn’t account for things like unexpected parameters.

We would like to be able to have the complete tagged URL. Has anyone figured out a way to do this?

Thanks!