use poem::{handler, listener::TcpListener, post, web::Json, Route, Server};

#[handler]
fn echo(val: Json<serde_json::Value>) -> Json<serde_json::Value> {
    val
}

#[tokio::main]
async fn main() -> Result<(), std::io::Error> {
    let app = Route::new().at("/echo", post(echo));
    Server::new(TcpListener::bind("0.0.0.0:3000"))
      .run(app)
      .await
}

from locust import FastHttpUser, task
import json

# Opening JSON file
f = open('large-file.json')
data = json.load(f)


class HelloWorldUser(FastHttpUser):
    @task
    def hello_world(self):
        self.client.post(
            "/echo",
            json=data
        )