问题：
解决：
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a.com { gzip proxy / http://127.0.0.1:1111 { transparent } } |
或者
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a.com { gzip proxy / http://127.0.0.1:1111 { header_upstream Host {host} header_upstream X-Real-IP {remote} header_upstream X-Forwarded-For {remote} header_upstream X-Forwarded-Port {server_port} header_upstream X-Forwarded-Proto {scheme} } } |
参考：