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【Q050】http 状态码 502 和 504 有什么区别 #51

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shfshanyue opened this issue Nov 22, 2019 · 2 comments
Open

【Q050】http 状态码 502 和 504 有什么区别 #51

shfshanyue opened this issue Nov 22, 2019 · 2 comments
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@shfshanyue
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@sjfkai
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sjfkai commented Nov 22, 2019

  • 502 Bad Gateway
    The server was acting as a gateway or proxy and received an invalid response from the upstream server.
    收到了上游响应但无法解析

  • 504 Gateway Timeout
    The server was acting as a gateway or proxy and did not receive a timely response from the upstream server.
    上游响应超时

@shfshanyue
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这两种异常状态码都与网关 Gateway 有关，首先明确两个概念

  • Proxy (Gateway)，反向代理层或者网关层。在公司级应用中一般使用 Nginx 扮演这个角色
  • Application (upstream serrver)，应用层服务，作为 Proxy 层的上游服务。在公司中一般为各种语言编写的服务器应用，如 Go/Java/Python/PHP/Node 等

此时关于 502 与 504 的区别就很显而易见

  • 502 Bad Gateway。一般表现为你自己写的应用层服务(Java/Go/PHP)挂了，网关层无法接收到响应
  • 504 Gateway Timeout。一般表现为应用层服务 (upstream) 超时，如查库操作耗时十分钟，超过了 Nginx 配置的超时时间

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@sjfkai @shfshanyue