main.rs

// Create a Map of string key-value pairs 
// to represent the body payload
let mut map = HashMap::new();
map.insert("lang", "rust");
map.insert("body", "json");


// - Doing a POST request
// - Parse the response to the "JSONResponse" struct
let resp_json = client.post("https://httpbin.org/anything")
    .json(&map)
    .send()
    .await?
    .json::<JSONResponse>()
    .await?;

println!("{:#?}", resp_json);
// Output:
/*
JSONResponse {
    json: {
        "body": "json",
        "lang": "rust",
    },
}
*/