Could not find a version that satisfies the requirement corsheaders (from versions: ) No matching di

错误：

Could not find a version that satisfies the requirement corsheaders (from versions: ) No matching distribution found for corsheaders

解决：

1、升级pip

python -m pip install --upgrade pip

2、安装django-cors-headers，（不是djangocorsheaders）：

pip install django-cors-headers