Function echo 

pub async fn echo(__arg0: Json<EchoRequest>) -> Json<EchoResponse>

Echoes back the message sent in the request.

Arguments

• payload - The JSON payload containing the message to be echoed.

Returns

A JSON response containing the echoed message.

Example

use axum::Json;
use serde_json::json;

let payload = Json(json!({ "message": "Hello, world!" }));
let response = echo(payload).await;
assert_eq!(response.echoed, "Hello, world!");