Passing variables with cfhttp

I need to pass a dynamic variable using cfhttp. 

This code:

<cfhttp method="get" url="#cgi.server_name#/page.cfm?pageid=#pageid#" resolveurl="Yes">

<cfoutput>

    #cfhttp.FileContent#

</cfoutput>

Returns the error:

The 3 parameter of the Mid function, which is now -8, must be a non-negative integer.

This code returns the same error.

<cfhttp method="post" url="#cgi.server_name#/page.cfm" resolveurl="Yes">

    <cfhttpparam type="Formfield"

        value="#pageid#"

        name="pageid">

</CFHTTP>

<cfoutput>

    #cfhttp.FileContent#

</cfoutput>

Any assistance would be appreciated.