我确实在堆栈溢出中发现了同样的问题，我确实尝试了他们的一些解决方案，但没有一个对我有用。我尝试过的一些解决方案是，
1) 删除代理
2) 将 gem 文件的源从“ https://rubygems.org ”更改为“ http://rubygems.org ”
这些都不能为我解决这个问题。以下是我运行捆绑安装时遇到的错误。注意：我以这种方式安装 gems 已经有一段时间了。我最近才开始收到此错误。有谁知道为什么会发生这种情况？提前致谢！
The dependency tzinfo-data (>= 0) will be unused by any of the platforms
Bundler is installing for. Bundler is installing for ruby but the dependency
is only for x86-mingw32, x86-mswin32, x64-mingw32, java. To add those
platforms to the bundle, run `bundle lock --add-platform mingw, mswin,
x64_mingw, jruby`.
Fetching source index from https://rubygems.org/
Retrying fetcher due to error (2/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Retrying fetcher due to error (3/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Retrying fetcher due to error (4/4): Bundler::HTTPError Could not fetch
specs from https://rubygems.org/
Could not fetch specs from https://rubygems.org/
Process finished with exit code 17
更新
我去了网站http://isup.me/rubygems.org并收到了消息，
It's just you. http://rubygems.org is up.