Magento Marketplace Installation & Varnish Test: file could not be downloaded 500

[RafaelCorreaGomes]

I submitted an extension to the Magento Marketplace, but I'm seeing this weird issue below, how could I solve it?

composer require rafaelcg/magento2-quicklink:2.0.4 2>&1 

                                                                                                                  
  [Composer\Downloader\TransportException]                                                                        
  The "https://repo.magento.com/packages.json" file could not be downloaded (HTTP/1.1 500 Internal Server Error)  
                                                                                                                  

require [--dev] [--prefer-source] [--prefer-dist] [--no-progress] [--no-suggest] [--no-update] [--no-scripts] [--update-no-dev] [--update-with-dependencies] [--update-with-all-dependencies] [--ignore-platform-reqs] [--prefer-stable] [--prefer-lowest] [--sort-packages] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--apcu-autoloader] [--] []...

This is my composer.json

{
    "name": "rafaelcg/magento2-quicklink",
    "description": "Faster subsequent page-loads by prefetching in-viewport links during idle time",
    "version": "2.0.4",
    "require": {
        "php": "~7.0.13|~7.1.0|~7.2.0|~7.3.0"
    },
    "type": "magento2-module",
    "license": [
        "OSL-3.0",
        "AFL-3.0"
    ],
    "autoload": {
        "files": ["registration.php"],
        "psr-4": {
            "Rafaelcg\\Quicklink\\": ""
        }
    }
}

[mohit_rane]

Did you find any solution?

[RafaelCorreaGomes · Accepted solution]

It's solved, it was an issue from their side, but for someone else having the same issue, I recommend to check this answer and this Devdocs page.