How can I post json data?

[zacard-orc]

I browsed the official document,but i can't found any info about postjson.

I try this way,but no effect,

local post_data = {
   sn = sn
}
local headers = {}
headers["Content-Type"] = "application/json;charset=utf-8"
headers["Accept"] = "application/json"

local postdata_json = json.encode(post_data)
c:setopt_httpheader(headers)
c:setopt_postfields(postdata_json)
c:setopt_writefunction(function(response_data)
   alert(response_data) 
end)

c:perform()
c:close()

can u help me ,give a sample?

[NTBBloodbath]

Hey buddy, did you try adding c:setopt_post(true) somewhere already?

[myrkraverk]

I'm sure zacard figured this out long time ago, but for anyone else coming across this and still wondering, here's an example.

local easy = curl.easy{
   url = "https://api.example.com/where/you/upload",
   httpheader = { "Api-Key: " .. api_key,
      "Content-Type: application/json" },
   postfields = json.encode( payload ),
   [ curl.OPT_VERBOSE ] = true }

easy:perform()

Of course, you don't need the verbosity for JSON to work, but I thought to leave it in the example for people still debugging. Any JSON library with an encode() function will do, or you can adjust it for your own.