Plotly-Dash 回调在 Nginx 后面用空 url 属性触发

Question

我在 gunicorn WSGi 上有 flask+dash 网站运行。所有虚线图都通过

管理

@appReporting.callback(Output("page-content", "children"), [Input("url", "pathname")])

效果很好。当我把 gunicorn 放在 nginx 后面时，回调函数被调用，url 总是设置为 None。

Nginx 配置如下：

##
# Basic Settings
##

sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;

# server_names_hash_bucket_size 64;
# server_name_in_redirect off;

include /etc/nginx/mime.types;
default_type application/octet-stream;

##
# SSL Settings
##

ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;

##
# Logging Settings
##

access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;

##
# Gzip Settings
##

gzip on;

# gzip_vary on;
gzip_proxied any;
gzip_min_length 500;
gzip_disable "MSIE [1-6]\."
# gzip_comp_level 6;
# gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

##
# Virtual Host Configs
##

upstream app_servers {
    server  127.0.0.1:XXXX;     
}   

server {
    listen 80;
    
    return 301 https://$host$request_uri;   

}

server {
    listen 443 ssl;
    
    ssl_certificate certificate.pem;
    ssl_certificate_key key.pem;
    keepalive_timeout 70;

    
    location / {
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_ignore_headers Set-Cookie;
        proxy_hide_header    Set-Cookie;
        proxy_pass http://app_servers;
    }
    

}

有线索吗？即使是调试建议也很棒。

################ 附加信息，如果我只是将所需的 url 复制并粘贴到浏览器（因此是 GET 请求），则会触发回调，将路径名设置为正确的值，则会生成 404 错误。

Answer 1

很多故障排除，我希望这个答案能帮助一些开发人员。

为了让它工作，我从 nginx.conf 中删除了来自缓存的 POST 请求，从

更改

proxy_cache_methods 获取 POST

至

proxy_cache_methods 得到

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Plotly-Dash 回调在 Nginx 后面用空 url 属性触发