json - 使用 drakma :http-request 发布 JSON 数据

Question

我正在尝试使用 drakma 将一些 JSON 数据发布到 Web 服务.

    (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* '(("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*)

不幸的是，我得到了一个错误，尽管我认为数据似乎已正确编码为 JSON 并且 drakma 生成的 header 也是如此。显然 :content 有问题(错误消息中的整数列表只是 JSON 编码数据的 ASCII 代码列表)。

json:"{\"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
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@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)
                                                          (*)).

知道这段代码有什么问题吗？非常感谢。

Answer 1

感谢 Drakma 和 Chunga drakma-devel 的一般兴趣列表中的 Kevin 和 Hans 帮助我解决问题 - 结果发现问题是由最新版本的 cl+ssl 中的错误引起的，该错误已在开发中修复分支。我用 quicklisp ，这是 Hans Hübner 建议我更新我的 cl+ssl 安装的建议，这很有效:

You can check out the latest cl+ssl - which contains a fix for the problem:

cd ~/quicklisp/local-projects/
git clone git://gitorious.org/cl-plus-ssl/cl-plus-ssl.git

Quicklisp will automatically find cl+ssl from that location. Remember to remove that checkout after you've upgraded to a newer quicklisp release that has the fix in the future.