nginx的upstream timer out

在Nginx中，当上游服务器的响应时间超过了预设的超时时间，就会触发upstream timeout（上游超时）的情况。上游超时可以通过检查upstream模块的源码找到相关的代码来确定。
在源码中，可以找到ngx_http_upstream_process_upstream函数来处理上游请求。在这个函数中，如果接收到了上游超时的信号，则会将upstream_error标记为1，并记录日志信息。然后会调用ngx_connection_error函数来抛出NGX_ETIMEDOUT错误，并终止请求的处理。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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