摘要： 今天发现nginx有不少的499错误，大约占了将近0.5%，而且是在新上线了一个含upstream的业务之后。grep一下nginx源码，定义在ngx_request_t.h/** HTTP does not define the code for the case when a client closed* the connection while we are processing its request so we introduce* own code to log such situation when a client has closed the connection* befo 阅读全文