Proxy - an nginx requirement. When accessing a web service, if the user is a test user, it will be forwarded to the test version of the web service.

Question

Requirement details:
A web service is divided into a formal server and a test server. Through the nginx proxy, the user will submit a login request (post method) to nginx when first accessing. Nginx determines whether the logged-in user is a test user. If it is a test user, it will be forwarded to the test server. .

Problems encountered:
1. After determining that the user has implemented it, how can subsequent requests be sent to the same server? I want to achieve this by saving a variable, but nginx variables cannot exist across requests. Can I save the variable by reading and writing files? .

2. How to implement the jump method?
Below is part of my code
First visit 127.0.0.1/smdb

        location /smdb {
        default_type 'text/plain';
        set $jump 0;
        access_log /var/log/nginx/smdb_access.log smdb;
        error_log /var/log/nginx/error.log;
        log_subrequest on;
        lua_need_request_body on;
                client_max_body_size 50k;
                client_body_buffer_size 50k;
        content_by_lua '
            ngx.req.read_body()
            local args, err = ngx.req.get_post_args()
            if not args then
            ngx.say("failed to get post args: ", err)
            return
            end
            for key, val in pairs(args) do
            if val == "test" then
                ngx.var.jump = "1"
            end
            end
            ngx.exec("/tosmdb")
        ';
    }

    location /tosmdb {
        default_type 'text/plain';
        echo $jump;#注释掉下面，这里显示为1即判断出了用户
        if ($jump = "1"){
            proxy_pass http://smdbtest;
        }
        if ($jump = "0"){
            proxy_pass http://smdb;
        }
    }

Answer 1

You need to put all the credentials of the user after logging in into the cookie, and then it will be convenient for verification.

See the examples in https://github.com/cloudflare/lua-resty-cookie for details.

Using proxy_pass to jump should be no problem, it’s pretty good.