HTTP_HOST为空的排查和解决

1. 检查php输出

新建一个php文件,内容

<?php
var_dump([
    'HTTP_HOST' => $_SERVER['HTTP_HOST'] ?? 'NOT SET',
    'SERVER_NAME' => $_SERVER['SERVER_NAME'],
    'REQUEST_URI' => $_SERVER['REQUEST_URI']
]);
?>

可以看到HTTP_HOST字段为not set

2.检查nginx配置

打开/nginx/fastcgi.conf, 发现没有fastcgi_param HTTP_HOST $host;
添加即可