Detailed explanation of the problem of Nginx anti-generation Ollama interface not being able to output verbatim across domains

proxy_set_header origin http://ip:11434;

proxy_buffering off;
proxy_cache off;

proxy_set_header Connection '';
proxy_http_version 1.1;
chunked_transfer_encoding off;

server {
        listen 80;
        server_name domain name;
        return 301 https://$server_name$request_uri;
}
server {
        listen 443 ssl;
        server_name domain name;
        
		#ssl certificate configuration        ssl_certificate      /opt/nginx/conf/ssl/xxx/;
        ssl_certificate_key  /opt/nginx/conf/ssl/xxx/;
        ssl_session_cache    shared:SSL:1m;
        ssl_session_timeout  5m;
        ssl_ciphers  HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers  on;
        
 	# Anti-generation to the Ollama API    location /api/ {
    	# Ollama's default port is 11434        proxy_pass  http://Server IP: 11434;        # Origin request header at request        proxy_set_header origin http://Server IP: 11434;        
        # Turn off Nginx's response buffering and force data to be transferred to the client in real time        proxy_buffering off;
        # Use HTTP/1.1 to support long connections to avoid short connection problems in HTTP/1.0        proxy_cache off;
        # Ensure real-time streaming        proxy_set_header Connection '';
        proxy_http_version 1.1;
        # Close Nginx's block encoding processing (adjust according to actual situation)        chunked_transfer_encoding off;

        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;

        # Add CORS header        add_header 'Access-Control-Allow-Origin' '*' always;
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS' always;
        add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization' always;
        add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range' always;

        # Process preflight requests (OPTIONS)        if ($request_method = 'OPTIONS') {
            add_header 'Access-Control-Allow-Origin' '*';
            add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
            add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
            add_header 'Access-Control-Max-Age' 1728000;
            add_header 'Content-Type' 'text/plain; charset=utf-8';
            add_header 'Content-Length' 0;
            return 204;
        }
    }
}