[racket] response/output #:cookies keyword ???

Hi all,

Using Racket 6.0.1   response/output  is throwing an error when I use 
the #:cookies keyword:

application: procedure does not expect an argument with given keyword
   procedure: response/output
   given keyword: #:cookies
   arguments...:
    #<procedure:temp1>
    #:code 200
    #:cookies '()
    #:message #"OK"
    #:mime-type #"application/javascript"
    #:seconds 141522071

Code is:

(define (response/json obj . cookies )
   (response/output
       (λ (op) (write-json obj op))
       #:code 200
       #:message #"OK"
       #:seconds (current-seconds)
       #:mime-type #"application/javascript"
       #:cookies cookies
       ))

I get the same error with and without a list of cookies.  However, it 
works if I change the code to use

#:headers (map cookie->header cookies)


The 6.0.1 documentation (hope the cut-n-paste renders!)  indicates that  
#:cookies  is a valid keyword.  I checked the online docs for 6.1.1 and 
they still say the same:

    (response/output
    <mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.2&filename=http.html>
    		output 				
    	[ 	#:codecode 				
    		#:messagemessage 				
    		#:secondsseconds 				
    		#:mime-typemime-type 				
    		#:headersheaders 				
    		#:cookiescookies]) 		→ 		response?
    <mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.3&filename=http.html>


output:(-> 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.4&filename=function-contracts.html>output-port? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.5&filename=port-ops.html>void? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.6&filename=void.html>) 

code:number? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.7&filename=number-types.html>=200 

message:bytes? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.8&filename=bytestrings.html>=#"Okay" 

seconds:number? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.7&filename=number-types.html>=(current-seconds 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.9&filename=time.html>) 

mime-type:(or/c 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.10&filename=data-structure-contracts.html>bytes? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.8&filename=bytestrings.html>#f)=TEXT/HTML-MIME-TYPE 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.11&filename=http.html> 

headers:(listof 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.12&filename=data-structure-contracts.html>header? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.13&filename=http.html>)='() 

cookies:(listof 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.12&filename=data-structure-contracts.html>cookie? 
<mailbox:///C:/Users/GW/Documents/Eudora/GW/Mail/Local%20Folders/Drafts?number=5706892&part=1.14&filename=cookie.html>)='() 




I know that cookies are placed using headers and that there is no 
separate field in the actual response, but seeing this I expected that 
the function would create the appropriate header(s) for me. Obviously  
(map cookie->header ...) is an easy work-around, but I'd like to know if 
this is a documentation error or if I really was doing something wrong.  
Or possibly prematurely - is  #:cookies  implemented in 6.1.x ?

Thanks,
George

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