Nginx 502 报错 upstream sent too big header while reading response header from upstream

业务中一个php的接口get信息的时候 ，会偶然引起nginx 502 错误
查看nginx错误日志 得到报错信息:

upstream sent too big header while reading response header from upstream

可以看出是header头信息过大引起nginx报错

需要修改nginx的主配置文件
在http模块加入

http {
  proxy_buffer_size   128k;
  proxy_buffers   4 128k;
  proxy_busy_buffers_size   256k;
  proxy_temp_file_write_size 256k;
}
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在server块的配置中加入

location ~ .php$ {
    fastcgi_buffer_size 128k;
    fastcgi_buffers 4 128k;
    fastcgi_busy_buffers_size 256k;
}
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注意 proxy_temp_file_write_size 的值必须要大于等于 proxy_buffer_size 和 proxy_buffers的值,否则nginx会报错

"proxy_temp_file_write_size" must be equal to or greater than the maximum of the value of "proxy_buffer_size" and one of the "proxy_buffers" in /usr/local/nginx/config/nginx.conf:134

参考链接

https://stackoverflow.com/questions/13894386/upstream-too-big-nginx-codeigniter