推荐回答（1个）
报出的错误代码是多少 404？ 500？
404
Not Found 无法找到指定位置的资源。这也是一个常用的应答。
405
Method Not Allowed 请求方法（GET、POST、HEAD、Delete、PUT、TRACE等）对指定的资源不适用。
406
Not Acceptable 指定的资源已经找到，但它的MIME类型和客户在Accpet头中所指定的不兼容。
407
Proxy Authentication Required 类似于401，表示客户必须先经过代理服务器的授权。
408
Request Timeout 在服务器许可的等待时间内，客户一直没有发出任何请求。客户可以在以后重复同一请求。
409
Conflict 通常和PUT请求有关。由于请求和资源的当前状态相冲突，因此请求不能成功。
410
Gone 所请求的文档已经不再可用，而且服务器不知道应该重定向到哪一个地址。它和404的不同在于，返回407表示文档永久地离开了指定的位置，而404表示由于未知的原因文档不可用。
411
Length Required 服务器不能处理请求，除非客户发送一个Content-Length头。
412
Precondition Failed 请求头中指定的一些前提条件失败。
413
Request Entity Too Large 目标文档的大小超过服务器当前愿意处理的大小。如果服务器认为自己能够稍后再处理该请求，则应该提供一个Retry-After头。
414
Request URI Too Long URI太长。
416
Requested Range Not Satisfiable 服务器不能满足客户在请求中指定的Range头。
500
Internal Server Error 服务器遇到了意料不到的情况，不能完成客户的请求。
501
Not Implemented 服务器不支持实现请求所需要的功能。例如，客户发出了一个服务器不支持的PUT请求。
502
Bad Gateway 服务器作为网关或者代理时，为了完成请求访问下一个服务器，但该服务器返回了非法的应答。
503
Service Unavailable 服务器由于维护或者负载过重未能应答。例如，Servlet可能在数据库连接池已满的情况下返回503。服务器返回503时可以提供一个Retry-After头。
504
Gateway Timeout 由作为代理或网关的服务器使用，表示不能及时地从远程服务器获得应答。
505
HTTP Version Not Supported 服务器不支持请求中所指明的HTTP版本。
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