问nginx反向代理wss无法成功升级websocket是怎么回事？

http 
{
#include      /nginx/conf/naxsi_core.rules;
include       mime.types;
default_type  application/octet-stream;

#access_log  logs/access.log  main;
access_log  off;

map $http_upgrade $connection_upgrade {
	default upgrade;
	'' close;
}
upstream websocket {
	server 192.168.1.58:13527;
	keepalive 512;
}
server {
	listen 80;
	listen 443;
	server_name wss.com;
	
	charset utf-8;

	ssl	on;  # 启用ssl功能
	ssl_certificate		/test/test.crt;
	ssl_certificate_key /test/test.key;
	
	ssl_session_timeout 5m;
	ssl_session_cache shared:SSL:50m;
	ssl_protocols SSLv3 SSLv2 TLSv1 TLSv1.1 TLSv1.2;
	ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
	ssl_prefer_server_ciphers on;
	ssl_verify_client off;
	add_header Cache-Control no-store;
	
	keepalive_timeout 3600s;
	keepalive_requests 10000000;
		
	proxy_http_version 1.1;
	
	if ($request_method = 'OPTIONS') {
		return 204;
	}
	
	location /wss 
	{
		proxy_redirect off;
		
		proxy_set_header Host $host:$server_port;
		proxy_set_header X-Real_IP $remote_addr;
		proxy_set_header X-Forwarded-For $remote_addr:$remote_port;
		proxy_set_header X-Forwarded-Host $Server_name;
		proxy_set_header X-NginX-Proxy true;
		
		proxy_connect_timeout 12000s;
		proxy_read_timeout 36000s;
		proxy_send_timeout 36000s;
		proxy_set_header Upgrade $http_upgrade;
		proxy_set_header Connection $connection_upgrade;
		
		# proxy_buffering off;
		
		proxy_pass http://websocket/;
	}

  }


}

2020/12/09 10:24:43 [error] 8048#8724: *5 upstream sent no valid HTTP/1.0 header while reading response header from upstream, client: 192.168.1.58, server: wss.com, request: "GET /wss HTTP/1.1", upstream: "http://192.168.1.58:13527/", host: "wss.com"