Simple request from emacs

gistfile1.el

  (let* ((url-request-method "POST")
           (url-request-extra-headers '(("Content-Type" . "application/json")))
           (url-request-data
            (encode-coding-string (concat "{"
                                          "\"content\": \"* HELLO WORLD\""
                                          "}"
                                          ) 'utf-8)
            )
           )                               ;end of let varlist
      (url-retrieve "http://127.0.0.1:9393/api/text.json" 
                    '(lambda (status)
                       (switch-to-buffer (current-buffer))
                       ))
      )