The following is a nginx log:
175.171.184.77 - [15/Jul 2017:14:19:35 + 0800] "POST/newsedit/upload HTTP/1.1", 405 "http://www.xxx.com/newsedit/create" "Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3128.0 Safari/537.36 "

The following is the analysis process:
1, the code in the local Windows environment (not use nginx) run without exception, upload function to normal;
2, to deploy on a Linux server, use the nginx, upload function to 405 error;
3, in the same Linux server deployed on another set of applications also have a file upload function, can be used normally;
4, therefore, the analysis is nginx configuration problems;

Here are two sets of the same Linux server application nginx configuration:
1, upload function:

 
Server {
Listen, 80; 
Server_name xxx.com xxx.net yyy.com yyy.net; 

Access_log logs/portal. Access. The log; 

The location/{
The root HTML; 
index  index.html index.htm; 
Proxy_pass http://www.xxx.com:8300; 
} 
The location/portal {
The root HTML; 
index  index.html index.htm; 
Proxy_pass http://www.xxx.com:8300; 
} 
The location/privacy. HTML {
The root HTML; 
Proxy_pass http://asset.xxx.com:9001/privacy.html; 
} 

Error_page 504/50, 500, 502, 503 x. HTML; 
Location=/50 x) HTML {
The root HTML; 
} 

2, and upload function to normal:

 
Server {
Listen, 80; 
Server_name m.xxx.com m.xxx.net m.yyy.com m.yyy.net; 

Access_log logs/maintenance. Access. The log; 

The location/{
The root HTML; 
index  index.html index.htm; 
Proxy_pass http://m.xxx.com:9300; 
Proxy_redirect default; 
} 

The location ^ ~/eplus/ws/server {
Proxy_pass http://m.xxx.com:9300; 

Proxy_set_header X - Real - IP $remote_addr; 
Proxy_set_header Host $Host; 
Proxy_set_header X - Forwarded - For $proxy_add_x_forwarded_for; 

Proxy_http_version 1.1; 
Proxy_set_header Upgrade $http_upgrade; 
Proxy_set_header Connection "upgrade". 
} 

Error_page 504/50, 500, 502, 503 x. HTML; 
Location=/50 x) HTML {
The root HTML; 
} 
}