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HTTP 431 Request Header Fields Too Large响应状态码指示服务器不愿意处理请求，因为它的头部字段太大。请求可以在减少请求头域的大小后重新提交。

它可以在请求头字段的总数太大或单个头字段太大时使用。

这个错误不应该发生在经过良好测试的生产系统上，但在测试新系统时可以更频繁地发现。

状态

431 Request Header Fields Too Large

规范

规范	标题
RFC 6585，第5节：431请求标头字段太大	其他HTTP状态码

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