pub fn parse_body(data: &str) -> Option<&str> {
    // Do stuff
    // ....
    Ok("xyz")
}

fn consume_data(req: HttpRequest<AppState>, body: bytes::Bytes) -> HttpResponse {
    let foo = parse_body(&body);
    // Do stuff
    HttpResponse::Ok().into()
}

use bytes::Bytes; // 0.4.10
use std::str;

fn example(b: &Bytes) -> Result<&str, str::Utf8Error> {
    str::from_utf8(b)
}