如果Magento2缓存标签使用长度超过8192个字符，你可以看到HTTP 503（后台读取失败）在浏览器中的错误。这些错误可能显示如下：
Error 503 Backend fetch failed
Backend fetch failed
为了解决这个问题，修改varnish配置文件如下:
- 用
root用户打开:- CentOS 6:
/etc/sysconfig/varnish - CentOS 7:
/etc/varnish/varnish.params - Ubuntu:
/etc/default/varnish
- CentOS 6:
- 搜索
http_resp_hdr_len参数. - 如果参数不存在增加
thread_pool_max. - 设置
http_resp_hdr_len示例:-p http_resp_hdr_len=64000 \代码片段:# DAEMON_OPTS is used by the init script. DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \ -f ${VARNISH_VCL_CONF} \ -T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \ -p thread_pool_min=${VARNISH_MIN_THREADS} \ -p thread_pool_max=${VARNISH_MAX_THREADS} \ -p http_resp_hdr_len=64000 \ -S ${VARNISH_SECRET_FILE} \ -s ${VARNISH_STORAGE}"
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