Dynamic Parameters for a CFHTTP POST Request

i need call service using cfhttp (post) parameters passed service dynamic there no way create static list of cfhttpparam tags. actually, there static parameters there dynamic parameters included in request based on values defined static parameters.

my question how pass form data in cfhttp post request when parameters passed not known in advance? see there type attribute cfhttpparam tag of "head" , "body" thinking might possible manually build data passed, proper way pass form parameters if construct "head" , "body" data myself?

what wrong dynamic <cfhttpparam...> tags. why exist.

<cfset foo = structnew()>
<cfset foo.joe = "avalue">
<cfset foo.bob = "bvalue">

<cfhttp ...>
<cfloop collection="#foo#" item="bar">
<cfhttpparam name="#bar#" value="#foo[bar]#">
</cfloop>
</cfhttp>

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