Passing large amounts of data from one page to another without POST?

I'm using a web server framework which works with only GET requests, at the moment I'm trying to pass a large amount of data, that is the text content in a textarea which comes from user input, into another page which echoes the user's input.

I've attempted Querystrings but I end up receiving the error "Requested URL too long".

Any suggestions as to what method I should use?