Imgur image URL is using the relative protocol

[Hari-Bonda]

https://discuss.flarum.org/d/18316-flarum-seo/498

public function setImageFromContent($content = null)
    {
        // Check post content is not empty
        if($content !== null) {
            // Read Post content and filter image url
            $pattern = '/(?<=src=")((http.*?\.)(jpe?g|png|[tg]iff?|svg))(?=")/';

            // Use image from post for social media og:image
            if (preg_match_all($pattern, $content, $matches) && count($matches) > 0) {
                $contentImage = $matches[0][0];

                if ($contentImage !== null) {
                    $this->setImage($contentImage);
                    return $this;
                }
            }
        }

        return $this;
    }

To solve this, remove preg replace

file: /vendor/fof/upload/src/Adapters/Imgur.php
// successful upload, let's get the generated URL
        if ($response->getStatusCode() == 200) {
            $meta = Arr::get(json_decode($response->getBody(), true), 'data', []);

            $link = Arr::get($meta, 'link');

            $file->url = $link; //preg_replace('/^https?:/', null, $link);
            $file->remote_id = Arr::get($meta, 'id');
        }