前端获取后端所给签名的时候返回'Access-Control-Allow-Originheader？
'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. Origin 'null' is therefore not allowed access. 怎么解决？？
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'Access-Control-Allow-Origin' header contains multiple values '*, *', but only one is allowed. Origin 'null' is therefore not allowed access. 怎么解决？？
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