How to do a POST request using Luvit

I'm using Luvit for one of my projects which uses some online APIs to make the things simpler. One such API asks me to do a POST request to their endpoint to deal with the data. I looked at their official documentation, and even some unofficial ones, but ended up finding nothing. I even tried some of the following and nothing seems to be working

local http = require("coro-http")

coroutine.wrap(function()
    local head, body = http.request("POST", JSON_STORE_CLIENT, {{"Content-Type", "application/json"}}, "test")
    print(head)
    print(body)
end)()
--[[
table: 0x7f5f4a732148
<!DOCTYPE html>
<html lang="en">
...
basically tells its a bad request
</html>
]]

Can somebody help me in doing REST operations with luvit, especially POST, correctly?

Solution

Your http.request works as expected and it returns response table (not only headers) and body string.

You posting Content-Type: application/json but sending invalid data. Body must be valid JSON object:

local http = require("coro-http")
local json = require("json")

coroutine.wrap(function()
    local data = {param1 = "string1", data = {key = "value"}}
    local res, body = http.request("POST", JSON_STORE_CLIENT,
      {{"Content-Type", "application/json"}},
      json.stringify(data))
      -- or static string [[{"param1": "string1", "data": {"key": "value"}}]]
    print(res.code)
    print(body)
end)()