为什么 NGINX 使用自定义变量代理 ws 会异常？

贴上完整配置

 server { listen 443 ssl; client_max_body_size 20M; index index.html; ssl_certificate /etc/nginx/templates/1.pem; ssl_certificate_key /etc/nginx/templates/1-key.pem; ssl_session_timeout 5m; ssl_protocols TLSv1.2; ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:HIGH:!aNULL:!MD5:!RC4:!DHE; ssl_prefer_server_ciphers on; server_name ${NGINX_HOST}; index index.html; set $api_port 8877; set $api_host api; #add_header Access-Control-Allow-Origin *; #add_header Access-Control-Allow-Credentials true; #add_header Access-Control-Allow-Methods GET,POST; location / { expires off; add_header Cache-Control "no-store, no-cache, must-revalidate, proxy-revalidate, max-age=0"; #try_files $uri $uri/ /index.html; index index.html; root /www/dist/; server_tokens off; } location /ws/ { proxy_pass http://$api_host:8877/ws/; proxy_http_version 1.1; proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "Upgrade"; proxy_connect_timeout 90s; proxy_send_timeout 120s; proxy_read_timeout 120s; send_timeout 120s; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded $proxy_add_x_forwarded_for; } location ^~/prod-api/ { rewrite ^/prod-api/(.*)$ /$1 break; proxy_set_header X-Forwarded-Proto $scheme; # proxy_redirect off; proxy_set_header Host $host; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded $proxy_add_x_forwarded_for; proxy_pass http://$api_host:$api_port; 字数超了。。。。。。。。 } } }