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Re: Questions about the (web client) module.
From: |
Mark H Weaver |
Subject: |
Re: Questions about the (web client) module. |
Date: |
Fri, 21 Jul 2017 00:49:36 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.2 (gnu/linux) |
Roel Janssen <address@hidden> writes:
>>> Then my next question is about "multipart/form-data" content types.
>>> My code looks like this:
>>>
>>> #:headers `((content-type . ,(string-append
>>> "multipart/form-data; boundary=" boundary))
>>> (Accept . "*/*"))
>>>
>>> But that does not work:
>>> scheme@(guile-user)>
>>> web/request.scm:184:10: In procedure build-request:
>>> web/request.scm:184:10: Bad request: Bad value for header content-type:
>>> "multipart/form-data; boundary=..."
>>>
>>> This is, however, a valid Content-Type.
>>
>> What’s the value of ‘boundary’? At first sight it looks good to me:
>
> The value I use is "guile-virtuoso-driver". All of the below
> functions work as expected with this value.
>
> Could it be that something else is wrong?
> Here's the entire code I use:
>
> (define* (sparql-query-post query
> #:key
> (host "localhost")
> (port 8890)
> (graph "")
> (type "json"))
> (let ((base-uri (string-append "http://" host ":" (number->string port) ))
> (boundary "guile-virtuoso-driver"))
> (let ((body (string-append
> (format #f
> "--~a~%Content-Disposition: form-data;
> name=~s~%~%text/csv~%"
> boundary "format")
> (format #f
> "--~a~%Content-Disposition: form-data;
> name=~s~%~%~a~%--~a~%"
> boundary "query" query boundary))))
> (http-post
> (string-append base-uri "/sparql")
> #:body body
> #:headers `((content-length . ,(string-length body))
> (content-type . "multipart/form-data;
> boundary=guile-virtuoso-driver")
The line above should be replaced with this:
(content-type . (multipart/form-data (boundary . ,boundary)))
> (Accept . "*/*"))))))
and this should be:
(accept . ((*/*)))
These are the "parsed" form of HTTP headers, where the header names are
lowercase symbols and the associated values are not usually strings but
rather a Scheme representation of the value. See section 7.3.4 (HTTP
Headers) in the Guile manual for more information.
Mark