Few concepts in Nim in few lines of code

app.nim

import std/httpclient
import std/strutils
import std/json
import std/random

proc toJson(o: auto): string =
  result = $(%*o)

type
  MyBody = object
    id: string
  MyBody2 = object
    id: int

const authToken = "your-authorization-token"
let ids = readFile("ids.txt").splitLines

let headers = newHttpHeaders([
  ("Authorization", "Bearer " & authToken),
  ("User-Agent", "")
])
let client = newHttpClient(headers = headers)

for i, id in ids:
  let body =
    if rand(1) == 0:
      toJson(MyBody(id:id))
    else:
      toJson(MyBody2(id:i))
      
  let response = client.post("https://httpbin.org/post", body=body)
  if response.status == "200 OK":
    echo "ID: ", id, " - POST succeeded with status code 200. Body: " & response.body
  else:
    echo "ID: ", id, " - POST failed with status code ", response.status