我如何使用R和RCurl包编写以下curl POST方法？
curl -k -u myusername:mypassword -d '{"text":"Hello World!","level":"Noob"}' -H "Content-Type: application/json" -H "Accept: application/json" "http://api.website/v1/access?"
api post r rcurl
api ×1
post ×1
r ×1
rcurl ×1