无法使用SpringBoot发送Post请求

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

import org.springframework.web.bind.annotation.*;

@RestController
public class MyController {

    @PostMapping("/api/endpoint")
    public String handlePostRequest(@RequestBody String requestBody) {
        // 处理POST请求的逻辑
        return "Success";
    }
}

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class MyApp {

    public static void main(String[] args) {
        SpringApplication.run(MyApp.class, args);
    }
}

curl -X POST -H "Content-Type: application/json" -d '{"key": "value"}' http://localhost:8080/api/endpoint