400 Bad Request The plain HTTP request was sent to HTTPS port nginx/1.16.1

这个错误是Nginx服务器返回的错误，意思是收到的请求是通过HTTP发送到了HTTPS端口。这种错误通常发生在Nginx同时处理HTTP请求和HTTPS请求的情况下。当用户通过HTTP访问网站时（例如使用http://blog.yoodb.com），请求会在浏览器中显示错误信息"nginx 400 bad request The plain HTTP request was sent to HTTPS port"。这个错误的原因是每次用户试图通过HTTP访问网站时，请求会被重定向到HTTPS。然而，原始请求通过80端口发送的是普通的HTTP请求，导致产生错误。要解决这个问题，需要检查Nginx的配置文件，确保正确配置了HTTP和HTTPS的监听端口，并将请求正确地重定向到相应的端口。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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