dependency

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.5.0</version>
    </parent>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

Main.java

package org.example;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import java.util.Map;

@SpringBootApplication
public class Main {

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

@Controller
@RequestMapping("/api")
class RequestController {

    @PostMapping(path="/echo",
            consumes = MediaType.APPLICATION_FORM_URLENCODED_VALUE)
    public ResponseEntity<String> processFormPostBodyAndParams(
            @RequestParam Map<String, String> body) {

        return new ResponseEntity<>("Body param map: " + body, HttpStatus.OK);
    }

}

application.yml

server:
  port: 8088
  http2:
    enabled: true

when use http1.1 it work

Image

when use http2 it not work Image