相关疑难解决方法(0)

我正在尝试使用Rocket crate创建后端：

fn main() {
    rocket::ignite().mount("/", routes![helloPost]).launch();
}

#[derive(Debug, PartialEq, Eq, RustcEncodable, FromForm)]
struct User {
    id: i64,
    USR_Email: String,
    USR_Password: String,
    USR_Enabled: i32,
    USR_MAC_Address: String
}

#[post("/", data = "<user_input>")]
fn helloPost(user_input: Form<User>) -> String {
    println!("print test {}", user_input);
}

当我运行时cargo run一切正常，但是当我使用邮递员发送 POST 请求进行测试时，我收到此错误：

fn main() {
    rocket::ignite().mount("/", routes![helloPost]).launch();
}

#[derive(Debug, PartialEq, Eq, RustcEncodable, FromForm)]
struct User {
    id: i64,
    USR_Email: String,
    USR_Password: String,
    USR_Enabled: i32,
    USR_MAC_Address: String
}

#[post("/", data = "<user_input>")]
fn helloPost(user_input: …