这个错误:
CORS 策略已阻止从源“http://localhost:19006”访问“https://pro-api.coinmarketcap.com/v1/cryptocurrency/listings/latest”获取:对预检请求的响应不通过访问控制检查:请求的资源上不存在“Access-Control-Allow-Origin”标头
...由该fetch
请求返回。
fetch(
"https://pro-api.coinmarketcap.com/v1/cryptocurrency/listings/latest",
{
headers: {
"Access-Control-Allow-Origin": "*",
"Access-Control-Allow-Methods": "*",
"Access-Control-Allow-Headers":
"'Access-Control-Allow-Headers: Origin, Content-Type, X-Auth-Token'",
"Content-Type": "application/json",
"X-CMC_PRO_API_KEY": API_KEY,
},
}
)
.then((response) => response.json())
.then((json) => console.log(json))
.catch((error) => console.error(error));
为什么会这样?