I did read and try the following;
- https://stackoverflow.com/a/46286973/8068675 listen = 127.0.0.1:9000;
 - https://stackoverflow.com/a/50615652/8068675 disable buffering
 - https://github.com/microsoft/WSL/issues/393#issuecomment-442498519 disable buffering + different config
 
But none of theses fixed the issue.
Issue
From Windows; when I browse my website located in WSL2 through http://myproject.test, https://myproject.test or 127.0.0.1 the first 2-3 requests are going fast (<100 ms). Then the next requests takes exactly 60000ms (1 minute) to be received when they are not blocked.
Configuration on Windows 10
- Firewall disabled
 127.0.0.1 myproject.testadded toC:\Windows\System32\drivers\etc\hosts- mkcerts installed
 - WSL 2 installed with Ubuntu 20.04 on it
 
Configuration on WSL 2
- Ubuntu 20.04
 - nginx 1.18
 - mysql 8.0
 - php-fpm 7.4
 
Project
- Laravel
 - location 
/home/clement/projects/myproject/ - certs (generated with mkcert) 
/home/clement/projects/certs/ - owner: 
clement:www-data - permission : 
777(It's only for test and development purpose) 
/etc/nginx/sites-available/myproject.test
server {
    listen 80;
    listen [::]:80;
    listen 443 ssl;
    listen [::]:443 ssl;
    ssl_certificate /home/clement/projects/certs/myproject.test.pem;
    ssl_certificate_key /home/clement/projects/certs/myproject.test-key.pem;
    client_max_body_size 108M;
    access_log /var/log/nginx/application.access.log;
    server_name myproject.test;
    root /home/clement/projects/myproject/public;
    index index.php;
    if (!-e $request_filename) {
        rewrite ^.*$ /index.php last;
    }
    location ~ \.php$ {
        fastcgi_buffering off;
        fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        fastcgi_index index.php;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PHP_VALUE "error_log=/var/log/nginx/application_php_errors.log";
        include fastcgi_params;
    }
}
I have the same issue using fastcgi_pass 127.0.0.1:9000; or fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
When I do php -S localhost:8080 or php artisan serve in the project, everything's working fine.
Edit with log
This is the log I'm getting on nginx, but even with this information I still cannot find any resource that fix the issue.
2020/08/07 23:06:30 [error] 1987#1987: *6 upstream timed out (110: Connection timed out) while reading upstream, client: 127.0.0.1, server: myproject.test, request: "GET /_debugbar/assets/javascript?v=1588748787 HTTP/1.1", upstream: "fastcgi://unix:/run/php/php7.4-fpm.sock:", host: "myproject.test", referrer: "http://myproject.test/"
Or using IP
2020/08/08 01:43:01 [error] 4080#4080: *4 upstream timed out (110: Connection timed out) while reading upstream, client: 127.0.0.1, server: myproject.test, request: "GET / HTTP/1.1", upstream: "fastcgi://127.0.0.1:9000", host: "myproject.test"