卷曲错误52“来自服务器的空答复"是什么? [英] What is the curl error 52 "empty reply from server"?

问题描述

我在一台服务器上有一个cron作业设置，以便在另一台服务器上托管的PHP中运行备份脚本.

I have a cron job setup on one server to run a backup script in PHP that is hosted on another server.

我一直在使用的命令是

curl -sS http://www.example.com/backup.php

最近，当Cron运行时，我一直收到此错误:

Lately I've been getting this error when the Cron runs:

curl: (52) Empty reply from server

如果我直接在浏览器中转到链接，则脚本运行良好，并且得到了我的小备份ZIP文件.

If I go to the link directly in my browser the script runs fine and I get my little backup ZIP file.

推荐答案

如果要求curl在执行HTTPS的服务器上执行纯HTTP，则会发生这种情况.

This can happen if curl is asked to do plain HTTP on a server that does HTTPS.

示例:

$ curl http://google.com:443
curl: (52) Empty reply from server

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