CORS in Action
SupposeyouneedtosharesomeJSONdatawithanotherapplicationorservice.Ifeverythingishostedononedomain,it'sasnap.Butifthedataisonanotherdomain,thebrowser's"same-origin"policystopsyoucold.CORSisanewwebstandardthatenablessafecross-domainaccesswithoutcomplex
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非常详细描述了跨域访问的问题和解决方法。