Javascript Symfony API 不返回任何响应

try 将symfony API与Reaction应用程序连接时，存在API拒绝返回任何响应的问题.但是，直接访问API链接时，返回的响应正确.

ApiDirectURL个

但是，try 通过Reaction应用程序获取此数据不会返回任何内容.

  const api_url = "http://127.0.0.1:8000/app-api/";
  const farmid = "1234567890123456789012345678901234567890";
  
  async function getFarmInfo() {
    const response = await fetch(api_url + farmid + "/info",{
      cache: "no-store", 
      mode: "no-cors",
      method: "GET",
      headers: {
        "Accept": "application/json"
      }});
    const jsonData = await response.json();
    console.log(jsonData);
  }

ServerResponse个

未响应API代码

   #[Route('/info', name: 'info')]
    public function info(Request $request,EntityManagerInterface $em,$fishingfarmid): Response
    {

        $farm = $em->getRepository(FishingFarm::class)->findOneBy(["trueId" => $fishingfarmid]);
        $json = ["phone" => $farm->getPhone() , "regulation" => $farm->getRegulations() , "email" => $farm->getEmail() , "address" => $farm->getAddress()];
        return new JsonResponse($json);
    }

然而，我意外地发现，如果我在某个地方使用var_ump("")；函数，react 代码中的响应会突然出现.

#[Route('/info', name: 'info')]
public function info(Request $request,EntityManagerInterface $em,$fishingfarmid): Response
{

    $farm = $em->getRepository(FishingFarm::class)->findOneBy(["trueId" => $fishingfarmid]);
    $json = ["phone" => $farm->getPhone() , "regulation" => $farm->getRegulations() , "email" => $farm->getEmail() , "address" => $farm->getAddress()];
    var_dump("");
    return new JsonResponse($json);
}

百人赛的结果