URL too long for HTTP_GET

I'm passing data as a query string in the URL calling the HTTP_GET function. Unfortunately, the length of the query string is beyond the 255 barrier of the URL. Is there a way to direct the query string parameters into one of the table(s) to accomplish my task (REQUEST_HEADERS or REQUEST_ENTITY_BODY)? If so, do the parameters take on the same format (field=value)? I would appreciate any help.

Thanks in advance.

Terry