How does nginx forward a header with a $ sign

Question

A Http Request has a header : $name ,access nginx forward ,the header will lose ,but I need the header:$name,how can I config the nginx?

example:

    location /api/ {
        proxy_pass         http://127.0.0.1:8081/;
        proxy_redirect     off;
        proxy_set_header   Host $host;
        proxy_set_header   $name $http_$name;
    }

Answer 1

Escape dollar sign by creating a variable with it:

http {
    geo $dollar {
        default "$";
    }
    server {
        ...
        location /api/ { 
            proxy_pass http://127.0.0.1:8081/; 
            proxy_redirect off; 
            proxy_set_header Host $host; 
            proxy_set_header ${dollar}name $http_$name; 
        }
    }
}