nginx出现警告：

proxy_headers_hash_max_size
proxy_headers_hash_bucket_size

警告信息如下：

Starting nginx: nginx: [warn] could not build optimal proxy_headers_hash, you should increase either proxy_headers_hash_max_size: 512 or proxy_headers_hash_bucket_size: 64; ignoring proxy_headers_hash_bucket_size
nginx: [warn] could not build optimal proxy_headers_hash, you should increase either proxy_headers_hash_max_size: 512 or proxy_headers_hash_bucket_size: 64; ignoring proxy_headers_hash_bucket_size
nginx: [warn] could not build optimal proxy_headers_hash, you should increase either proxy_headers_hash_max_size: 512 or proxy_headers_hash_bucket_size: 64; ignoring proxy_headers_hash_bucket_size

解决方案：
/etc/nginx/nginx.conf，在http里面增加

proxy_headers_hash_max_size 51200;
proxy_headers_hash_bucket_size 6400;