ColdFusion oAuth Authorization header not passing - coldfusion

Question

My authorisation header looks like this (params altered slightly for security and line breaked for easier reading):
<cfset oAuthHeader = 'OAuth oauth_consumer_key="zz3u0Lf9XxkC2KX839r2MS0fDltvLquow3ZMLaOw",
oauth_nonce="9BD4FAE88D1B213F86D908FE183F0501C682EE2F",
oauth_signature="Zy91IhXWGcMxyuAVIlGX%2F3ULTWU%3D",
oauth_signature_method="HMAC-SHA1",
oauth_timestamp="1337169270",
oauth_version="1.0"'
My cfhttp call looks like this:
<cfhttp url="#oRequestReq.getNormalizedHttpURL()#" method="POST">
<cfhttpparam type="header" name="Authorization" value="#oAuthHeader#">
<cfloop collection="#arguments#" item="key">
<cfif key neq 'fieldnames'>
<cfhttpparam type="formfield" name="#key#" value="#arguments[key]#">
</cfif>
</cfloop>
</cfhttp>
Running <cfdump var="#GetHttpRequestData()#">, I get the following, which shows that my fields are passing through as formfield params OK, but my Authorization header is nowhere to be seen.
![enter image description here][1]
Shouldn't the Authorization header be included in the Headers struct?
[1]: http://i.stack.imgur.com/VbQQO.jpg

Answer 1

How are you getting the oauth_signature? It's not a hard-coded thing in OAuth - it's being generated each time.
I'd suggest using this library http://oauth.riaforge.org/
There are some examples there that should help you get started.

Answer 2

Shouldn't it be...
<cfset oAuthHeader = {
'oauth_consumer_key'="zz3u0Lf9XxkC2KX839r2MS0fDltvLquow3ZMLaOw",
'oauth_nonce'="9BD4FAE88D1B213F86D908FE183F0501C682EE2F",
'oauth_signature'="Zy91IhXWGcMxyuAVIlGX%2F3ULTWU%3D",
'oauth_signature_method'="HMAC-SHA1",
'oauth_timestamp'="1337169270",
'oauth_version'="1.0"
}>
<cfhttp url="#oRequestReq.getNormalizedHttpURL()#" method="POST">
<cfloop collection="#oAuthHeader#" item="key">
<cfhttpparam type="header" name="#key#" value="#oAuthHeader[key]#">
</cfloop>
<cfloop collection="#arguments#" item="key">
<cfif key neq 'fieldnames'>
<cfhttpparam type="formfield" name="#key#" value="#arguments[key]#">
</cfif>
</cfloop>
...
</cfloop>
?