[drakma-devel] Error while trying to POST some JSON data

[rm at seid-online.de]

On Fri, Mar 22, 2013 at 12:57:15PM +0000, Peter Stirling wrote:
> I was getting this error too, I reverted to the previous version of cl+ssl 
> in quicklisp by putting it in the local-projects directory.
>
> I've been meaning to report another problem I've had with the new version 
> of drakma, it seems that when I POST login details to a site that I'm using 
> it replies with a redirect, 

How is the site redirecting? What's the HTTP status code they use?

> and then drakma tries to POST the login details 
> to the redirected page rather than accessing it with a GET. I'll try and 
> make a test case sometime this weekend.

Depending on the status code, that's actually valid behaviour.
(see: http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.2)

 HTH Ralf Mattes

> On 21/03/13 21:41, Peter Kuchta wrote:
>> Hi everybody,
>>
>> I'm trying to POST some JSON data to a web service:
>>
>>         (ql:quickload :st-json)
>>         (ql:quickload :cl-json)
>>         (ql:quickload :drakma)
>>
>>         (defvar *rc* (merge-pathnames (user-homedir-pathname) ".apirc"))
>>
>>         (defvar *user*
>>           (with-open-file (s *rc*)
>>             (st-json:read-json s)))
>>
>>         (defvar api-url (st-json:getjso "url" *user*))
>>         (defvar api-key (st-json:getjso "key" *user*))
>>         (defvar api-email (st-json:getjso "email" *user*))
>>
>>         (setf drakma:*header-stream* *standard-output*)
>>
>>         (defvar *req* '(("dataset" . "tigge")
>>                   ("step"    . "24")
>>                   ("date"    . "20071001")
>>                   ("time"    . "00")
>>                   ("origin"  . "all")))
>>
>>         (format t "json:~S~%" (json:encode-json-to-string *req*))
>>
>>         (defun retrieve (api request)
>>           (let* ((cookie-jar (make-instance 'drakma:cookie-jar))
>>                  (extra-headers (list (cons "From" api-email)
>>                                       (cons "X-API-KEY" api-key)))
>>                  (url (concatenate 'string api-url api "/requests"))
>>                  (stream (drakma:http-request url
>>                                :additional-headers extra-headers
>>                                :accept "application/json"
>>                                :method :post
>>                                :content-type "application/json"
>>                                :external-format-out :utf-8
>>                                :external-format-in :utf-8
>>                                :redirect 100
>>                                :cookie-jar cookie-jar
>>                                :content (json:encode-json-to-string 
>> request)
>>                                :want-stream t)))
>>               (st-json:read-json stream)))
>>
>>      (retrieve "/datasets/tigge" *req*)
>>
>> Unfortunately, I get an error, although the data seems to be encoded OK to 
>> JSON and the headers generated by drakma too, I think. Apparently 
>> something is wrong with the :content (the list of integers in the errors 
>> message is just the list of ASCII codes of the JSON encoded data).
>>
>> json:"{\"dataset\":\"tigge\",\"step\":\"24\",\"number\":\"all\",\"levtype\":\"sl\",\"date\":\"20071001\",\"time\":\"00\",\"origin\":\"all\",\"type\":\"pf\",\"param\":\"tp\",\"area\":\"70\\/-130\\/30\\/-60\",\"grid\":\"2\\/2\",\"target\":\"data.grib\"}"
>>
>>     POST /v1/datasets/tigge/requests HTTP/1.1
>>     Host: api.service.int <http://api.service.int>
>>     User-Agent: Drakma/1.3.0 (SBCL 1.1.5; Darwin; 12.2.0; 
>> http://weitz.de/drakma/)
>>     Accept: application/json
>>     Connection: close
>>     From: me at gmail.com <mailto:me at gmail.com>
>>     X-API-KEY: 19a0edb6d8d8dda1e6a3b21223e4f86a
>>     Content-Type: application/json
>>     Content-Length: 193
>>
>>
>>     debugger invoked on a SIMPLE-TYPE-ERROR:
>>       The value of CL+SSL::THING is #(123 34 100 97 116 97 115 101 116 34 
>> 58 34
>>                                   ...), which is not of type (SIMPLE-ARRAY
>>     (UNSIGNED-BYTE 8)
>>     (*)).
>>
>> Any idea what's wrong with this code? Many thanks in advance.
>>
>> Best regards,
>> Piotr
>>
>>
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>

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