信件图片在代理服务器后面显示为空白

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我仍然遇到这个问题。我查看了一下代码，正如我所料，代码实际请求的是 https://avatars.discourse-cdn.com/#{params[:version]}/letter/#{params[:letter]}/#{params[:color]}/#{params[:size]}.png。在 Discourse 容器内，我可以直接 wget 该文件并获得有效的 PNG。例如：https://avatars.discourse-cdn.com/v4/letter/b/bcef8e/48.png → https://forum.pkp.sfu.ca/48.png

在 production.log 中，它显示图像已成功下载，据称是这样的：


Started GET "/presence/get?channels%5B%5D=%2Fdiscourse-presence%2Freply%2F88689&channels%5B%5D=%2Fdiscourse-presence%2Fwhisper%2F88689" for 172.17.1.79 at 2024-07-09 19:59:01 +0000
Processing by PresenceController#get as JSON
Parameters: {"channels"=>["/discourse-presence/reply/88689", "/discourse-presence/whisper/88689"]}
Processing by UserAvatarsController#show_proxy_letter as PNG
Parameters: {"version"=>"v4", "letter"=>"b", "color"=>"bcef8e", "size"=>"48"}
Completed 200 OK in 14ms (Views: 0.5ms | ActiveRecord: 0.0ms | Allocations: 3095)
Completed 418 in 9ms (Views: 0.4ms | ActiveRecord: 0.0ms | Allocations: 1680)

所以不知何故，我仍然得到一个空白图像。也许它没有使用 HTTP_PROXY 或 HTTPS_PROXY 或其他东西。

在 site_settings.yml 中，它说默认的 letter_avatar_proxy url 是：" /letter_avatar_proxy/v4/letter/{first_letter}/{color}/{size}.png"，当我右键单击其中一个图像以获取 URL 时，它是（正确地？）https://forum.pkp.sfu.ca/letter_avatar_proxy/v4/letter/b/bcef8e/48.png