Nginx If cookie exist different location

I found the solutionand here is my config file which works :

proxy_cache_path /etc/nginx/cache levels=1:2 keys_zone=prerendercloud_cache:10m max_size=100m inactive=60m use_temp_path=off;server {    set $root /var/www/;    resolver 8.8.8.8;    set $prerendercloud 'service.prerender.cloud';    listen 80;    server_name _;    root $root;    location = / {        try_files $uri @prerendercloud;    }    location / {        try_files $uri $uri/index.html $uri/ /index.html;        index index.html;    }    location @prerendercloud {        proxy_set_header Accept-Encoding "gzip";        gunzip on;        proxy_set_header X-Prerender-Token 'my_token';        proxy_cache prerendercloud_cache;        proxy_cache_valid 200 5m;        proxy_intercept_errors on;        error_page 429 500 502 503 504 =200 /index.html;        proxy_cache_use_stale updating;        set $prerender 0;        if ($uri ~ "^(([^.]|\.html?)+)$") {            set $prerender "EXTENSION";        }        set $prerender "${prerender}-USER_AGENT";        if ($http_x_prerendered ~ true) {            set $prerender 0;        }        if ($http_user_agent ~ "prerendercloud") {            set $prerender 0;        }        if ($http_cookie ~* "access_token" ) {            set $prerender 0;        }        proxy_cache_key "$prerender$host$uri";        if ($prerender = "EXTENSION-USER_AGENT") {            rewrite .* /$scheme://$host$request_uri? break;            proxy_pass http://$prerendercloud$uri;            break;        }        rewrite .* /index.html break;    }}

now I know that nginx rewrite is not just about redirecting request with 301 or 302, It also can server content related to other location.so the most important thing I found out is rewrite != redirect (301, 302)