curl -X POST "http://localhost:5001/message" \
  -H "Content-Type: application/json" \
  -d '{
    "message_id": 123456789
  }'

const response = await fetch('http://localhost:5001/message', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    message_id: 123456789
  })
});

const data = await response.json();
console.log(data);

import requests

data = {
    "message_id": 123456789
}

response = requests.post('http://localhost:5001/message', json=data)
result = response.json()
print(result)

package main

import (
    "bytes"
    "encoding/json"
    "fmt"
    "net/http"
)

func main() {
    data := map[string]interface{}{
        "message_id": 123456789,
    }
    
    jsonData, _ := json.Marshal(data)
    
    resp, err := http.Post(
        "http://localhost:5001/message",
        "application/json",
        bytes.NewBuffer(jsonData),
    )
    if err != nil {
        panic(err)
    }
    defer resp.Body.Close()
    
    var result map[string]interface{}
    json.NewDecoder(resp.Body).Decode(&result)
    fmt.Printf("%+v\n", result)
}

{
  "message_id": 123456789,
  "message_seq": 1001,
  "client_msg_no": "msg_123",
  "from_uid": "user123",
  "channel_id": "group123",
  "channel_type": 2,
  "timestamp": 1640995200,
  "payload": "SGVsbG8gV29ybGQ="
}

{
  "error": "Message not found"
}