|-
| '''Summary'''
|Returns the names of all headers available from the HTTP request. If [[RESTXQ]] is used, this function may help can be used to access headers that have not been statically bound by [[RESTXQ#HTTP Headers|%rest:header-param]].
|}
|-
| '''Summary'''
|Returns the names of all cookies in the HTTP headers available from the HTTP request. If [[RESTXQ]] is used, this function may help can be used to access cookies that have not been statically bound by [[RESTXQ#Cookies|%rest:cookie-param]].
|}