I want to let a user of a web app enter a URL and then pass that URL onto curl. I'd rather use curl than Net::HTTP or open-uri. But this poses a security risk. What's the best way to check the URL string and prevent any injection attacks? I want to let a user of a web app enter a URL a
阅读背景：
Ruby中清除用户提供的url字符串的最佳方法是什么，以便可以安全地插入到shell命令中？
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