Q:

How do you get the response data as string using (web client) in guile?

I'm trying to get the response data as a string using the docs found here https://www.gnu.org/software/guile/manual/html_node/Web-Client.html.
The document mentions that http-request: 

Returns two values: the response read from the server, and the response body as a string, bytevector, #f value, or as a port ....

However, its not clear to me how to actually extract the string value. I can get the port, but not a plain string as mentioned in the docs.
(define response 
  (http-request (string-append "http://localhost:" port "/save")
                #:method 'POST 
                #:headers '((Content-Type . "application/json")) 
                #:streaming? #f
                #:decode-body? #t
                #:body (string->utf8 body)))

  (response-body-port response)

A:

The concept of multiple values in Guile (Scheme) is not common in other programming languages (ahead of its time :p).
You pointed out there are two return values. So let's get those two values. You can read more details here : https://www.gnu.org/software/guile/manual/guile.html#Multiple-Values
In the meantime, here is what I have tested using the Guile reference example :
(use-modules (web client))
(use-modules (ice-9 receive))

(receive (response-status response-body)
    (http-request "http://www.gnu.org")
  (display response-body))

I gave two "formal arguments" to receive to bind to the two return values of http-request. But I only use the second, aka response-body (as a string to display) because it is the one you where looking for.
Hope it helps !
P.S: Guile hackers are more active in the Guile mailing list than on StackOverflow. I'm watching, but I'm not your best asset haha.
Happy hacking !

