通过各种搜索，我在后端加了 header 允许的域名，但是提示 Access to XMLHttpRequest at '' from origin '' has been blocked by CORS policy: The 'Access-Control-Allow-Origin' header contains multiple values ', *', but only one is allowed.
请问怎么解决呀
请求, header, pdfjs-dist, PDF
请求, header, pdfjs-dist, PDF
