Baidu cloud acceleration is normal, but the NGINX I built shows 400. Please help me.
The situation is like this:
1# The domain name resolver resolves to Baidu Cloud Accelerator, and then resolves from Baidu Cloud Accelerator to the origin IP, 103.25.199.246; after that, the client opens completely normally, as shown in the middle frame as shown below it shows good. 
2# The following is the reverse generation acceleration achieved by using Nginx,
The origin site is: mkt.guticn.com
The origin site IP is: 103.25.199.246
The proxy domain name is: mkt.guticn.com
The proxy IP is: the public IP of your own proxy
The nginx configuration on the proxy is
server {
server_name mkt.guticn.com;
listen 80;
location / {
proxy_buffering 'off';
proxy_ignore_headers 'X-Accel-Buffering';
proxy_hide_header 'Access-Control-Allow-Origin';
proxy_hide_header ' Cache-Control';
proxy_set_header Host mkt.guticn.com
proxy_pass http://mkt.guticn.com;
proxy_set_header X-Real-IP '$remote_addr';
proxy_set_header X-Forwarded -For '$proxy_add_x_forwarded_for';
proxy_hide_header 'content-security-policy';
proxy_set_header Accept-Encoding '';
proxy_ignore_client_abort 'on';
proxy_set_header Accept-Language 'zh-CN';
proxy_set_header Connection 'upgrade';
if ($request_method = 'OPTIONS') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow- Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive ,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Accept';
add_header 'Access-Control-Max-Age' 1728000;
add_header 'Content- Type' 'text/plain charset=UTF-8';
add_header 'Content-Length' 0;
return 204;
}
if ($request_method = 'POST') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS ';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type, Accept';
}
if ($request_method = 'GET') {
add_header 'Access-Control-Allow-Origin' '*';
add_header 'Access-Control-Allow-Credentials' 'true';
add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
add_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User -Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Accept';
}
proxy_redirect ~http(.)guticn.com(. ) http$guticn.com$2;
proxy_cookie_domain guticn.com guticn.com;
}
}
Problems that arise:
Open http://mkt.guticn.com/onebook..., 400 appears, as shown in the figure below, 
## Can’t be displayed. It’s very strange. I can’t find it no matter how I check it. I’ve also grabbed the package and it’s no problem. It just shows 400. It’s annoying. Little sister, I’m going crazy. I’ve been doing this for several months. , the boss always urges me.
0x2# I also tried Accelerate, and then a 400 error also appeared.
0x3# I felt like it , must it be configured incorrectly?
Friends who have seen it, you can try it. Test method:
1. Open a virtual machine and install the above configuration.
2. Change the HOST of your physical machine to a virtual machine. , you can test it by accessing it. Thank you everyone.
