问openresty代理中的websockets

EN

worker_processes  auto;

env TARGET_APPLICATION_HOST;
env TARGET_APPLICATION_PORT;
env TARGET_USE_SSL;

events {
    worker_connections  1024;
}

http {
    server {
        listen 80;
        server_name localhost;
        
        location / {
            resolver local=on ipv6=off valid=100s;  
            
            content_by_lua_block {
                local http = require "resty.http"
                local httpc = http.new()
                
                httpc:set_timeout(500)                         
                local ok, err = httpc:connect(
                    os.getenv("TARGET_APPLICATION_HOST"),
                    os.getenv("TARGET_APPLICATION_PORT"))

                if not ok then
                    ngx.log(ngx.ERR, err)
                    return
                end

                if os.getenv("TARGET_USE_SSL") == "TRUE" then
                    -- Trigger the SSL handshake
                    session, err = httpc:ssl_handshake(False, server, False)  
                end

                httpc:set_timeout(2000)                         
                httpc:proxy_response(httpc:proxy_request())
                httpc:set_keepalive()                       
            }                   
        }
    }    
}