我什么时候应该转义网址？
我有一个 URL 并使用以下方法转义它：
url = "http://ec4.images-xxx.com/images/I/41-%2B6wMiewL._SL135_.jpg"
url = URI.escape(url)
puts url => "http://ec4.images-xxx.com/images/I/41-%252B6wMiewL._SL135_.jpg"
从结果中我可以看到 URI 再次转义了之前转义的 %2B ，变成了 %252B，这是不正确的。
我想知道如何确定何时应该对一个 URL 进行转义。或者，有没有一种聪明的方法，知道什么时候该逃，什么时候不该逃？
I have a URL and escaped it using:
url = "http://ec4.images-xxx.com/images/I/41-%2B6wMiewL._SL135_.jpg"
url = URI.escape(url)
puts url => "http://ec4.images-xxx.com/images/I/41-%252B6wMiewL._SL135_.jpg"
From the result I can see that URI escaped the previously escaped %2B again which became %252B, which is not correct.
I want to know how to make sure when one URL should be escaped. Or, is there a smart method that knows when to escape and when not to escape?
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您的第一个字符串已经正确进行了 URI 编码，因此当您尝试对其进行重新编码时，URI.escape 方法将使用“%25”对“%”进行编码（“+”的 URI 编码）。
如果您确实不确定您的字符串是否经过 URI 编码，您可以尝试先对其进行解码，然后将其与原始字符串进行比较。如果它们相同，则尚未编码。
Your first string is already properly URI encoded, so when you try to re-encode it, the URI.escape method is encoding the '%' with '%25' (URI encoding for '+').
If you're really not sure whether your string has been URI encoded or not, you could try to decode it first, and compare it with the original. If they're the same, then it hasn't been encoded.