上传文件时Nginx 502 Bad Gateway
当我尝试将文件上传到基于node.js的Web应用程序时，出现以下错误：
2014/05/20 04:30:20 [error] 31070#0: *5 upstream prematurely closed connection while reading response header from upstream, client: ... [clipped]
我在这里使用前端代理：
upstream app_mywebsite {
server 127.0.0.1:3000;
}
server {
listen 0.0.0.0:80;
server_name {{ MY IP}} mywebsite;
access_log /var/log/nginx/mywebsite.log;
# pass the request to the node.js server with the correct headers and much more can be added, see nginx config options
location / {
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header Host $http_host;
proxy_set_header X-NginX-Proxy true;
proxy_pass http://app_mywebsite;
proxy_redirect off;
# web socket support
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
}
这是我的nginx.conf文件：
user www-data;
worker_processes 4;
pid /run/nginx.pid;
events {
worker_connections 2048;
multi_accept on;
}
http {
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 20;
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;
default_type text/html;
charset UTF-8;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
gzip_vary on;
gzip_proxied any;
gzip_min_length 256;
gzip_comp_level 5;
gzip_buffers 16 8k;
gzip_http_version 1.1;
gzip_types text/plain text/css application/json application/x-javascript text/xml application/xml application/xml+rss text/javascript;
##
# nginx-naxsi config
##
# Uncomment it if you installed nginx-naxsi
##
#include /etc/nginx/naxsi_core.rules;
##
# nginx-passenger config
##
# Uncomment it if you installed nginx-passenger
##
#passenger_root /usr;
#passenger_ruby /usr/bin/ruby;
##
# Virtual Host Configs
##
include /etc/nginx/conf.d/*.conf;
include /etc/nginx/sites-enabled/*;
}
任何想法如何更好地调试呢？ 我发现的东西没有真正起作用（例如，从我的proxy_pass中删除尾部斜杠
尝试将以下内容添加到您的server{}块，我可以通过定义这些代理属性来解决Nginx反向代理问题：
# define buffers, necessary for proper communication to prevent 502s
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;
尝试将以下内容添加到/etc/nginx/nginx.conf的http部分：
fastcgi_read_timeout 400s;
并重新启动nginx。
进一步阅读：nginx文档
尝试这个：
client_max_body_size - 最大可上传文件大小
http {
send_timeout 10m;
client_header_timeout 10m;
client_body_timeout 10m;
client_max_body_size 100m;
large_client_header_buffers 8 32k;
}
和服务器部分：
server {
location / {
proxy_buffer_size 32k;
}
}
large_client_header_buffers 8 32k和proxy_buffer_size 32k - 对于大多数脚本来说足够了，但你可以尝试64k，128k，256k ...
（对不起，我不会说英文）=）
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