Re: extract headers from response record

[wolf <wolf@wolfsden.cz>]

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On 2023-08-09 10:18:05 -0400, Mortimer Cladwell wrote:
> Hi,
> I am running a local fake Urbit zod on port 8080. I want to submit an
> http-request and obtain an urbauth id cookie. I run the following method:
> 
> (use-modules (web client)(web response) (srfi srfi-9)(oop goops) (ice-9
> receive) (ice-9 pretty-print))
> 
> (define (urbit-http-connect)
>   (let* ((uri "http://localhost:8080/~/login")
>          (data (string-append "password=" "lidlut-tabwed-pillex-ridrup"))
> (a (receive (response body)
>   (http-request uri #:method 'POST #:body data)
>      response)))
>   (pretty-print a)))
> 
> ==> #<<response> version: (1 . 1) code: 204 reason-phrase: "ok" headers:
> ((date . #<date nanosecond: 0 second: 29 minute: 49 hour: 13 day: 9 month:
> 8 year: 2023 zone-offset: 0>) (connection close) (server .
> "urbit/vere-2.11") (set-cookie .
> "urbauth-~zod=0v7.126dd.8rbvk.lga05.jvieb.287to; Path=/; Max-Age=604800"))
> port: #<closed: file 7fc2a569b3f0>>
> 
> Below I substitute (pretty-print a) with various commands and show the
> response:
> 
> (pretty-print  (class-of a)) ==> #<<class> <<response>> 7f721fc4c280>
> (pretty-print  (record? a)) ==> #t
> (pretty-print  (response? a)) ==> #f
> 
> (pretty-print  (response-headers a)) ==> In procedure response-headers:
> Wrong type argument: #<<response> version: (1 . 1) code: 204 reason-phrase:
> "ok" headers: ((date . #<date nanosecond: 0 second: 34 minute: 0 hour: 14
> day: 9 month: 8 year: 2023 zone-offset: 0>) (connection close) (server .
> "urbit/vere-2.11") (set-cookie .
> "urbauth-~zod=0v5.9pm4c.pa0qd.00hao.vsq1p.h37hh; Path=/; Max-Age=604800"))
> port: #<closed: file 7fbaa95eb3f0>>
> 
> So I have a record that looks like a <response> record but isn't. How do I
> extract the headers from this 'response'?
> How do I determine the record type?

You are using the (receive) in a wrong way I believe.  The value you named body
holds the, well, body, but you are just throwing it away.  Try something like
this, it will print both the response and the body:

(use-modules (ice-9 receive)
             (web client))

(define (urbit-http-connect)
  (let* ((uri "http://example.org")
         (data (string-append "password=" "lidlut-tabwed-pillex-ridrup")))
    (receive (response body)
        (http-request uri #:method 'POST #:body data)
      (format #t "~s~%~s~%" response body))))

(urbit-http-connect)

> Thanks
> Mortimer

W.

-- 
There are only two hard things in Computer Science:
cache invalidation, naming things and off-by-one errors.

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