英文:
URL Escaping producing "%A(MISSING)" instead of "%3A"
问题
我正在使用Go语言的revel框架。最近，当我运行以下代码时：
import (
...
"net/url"
...
)
revel.INFO.Println(url.QueryEscape("http://hello.com"))
我得到的输出是：
INFO 2014/07/09 14:58:34 user.go:39: http%A(MISSING)%F(MISSING)%F(MISSING)hello.com
而我期望得到的是：
INFO 2014/07/09 14:58:34 user.go:39: http%3A%2F%2Fhello.com
为什么输出中的 %3A 被替换为 %A(MISSING)，我该如何修复它？
我唯一看到可能产生字符串 "(MISSING)" 的Go代码是在 fmt 包中，但从查看 net/url 源代码包中，我不明白为什么会发生这种情况。我可能在访问旧版本（有问题的版本）的Go库吗？还是我的设置可能出了其他问题？
相关链接：https://stackoverflow.com/questions/13820280/encode-decode-urls
相关的Go源代码：http://golang.org/src/pkg/net/url/url.go?s=14330:14361#L553
英文:
I am using the revel framework with the go language. Recently, when I run the following code:
import (
...
"net/url"
...
)
revel.INFO.Println(url.QueryEscape("http://hello.com"))
I get
INFO 2014/07/09 14:58:34 user.go:39: http%A(MISSING)%F(MISSING)%F(MISSING)hello.com
When I expect to get something more like
INFO 2014/07/09 14:58:34 user.go:39: http%3A%2F%2Fhello.com
Why has %3A been replaced by %A(MISSING) in the output and how can I fix it?
The only go code where I see something that might produce the string "(MISSING)' is in the fmt package, but from looking at the net/url source code package, I don't see how that could be happening. Am I perhaps somehow accessing an old (and broken?) version of the go libraries? Is something else possibly wrong with my setup?
Related: https://stackoverflow.com/questions/13820280/encode-decode-urls
Relevant Go Source code: http://golang.org/src/pkg/net/url/url.go?s=14330:14361#L553
答案1
得分: 7
revel.INFO.Println 类似于 fmt.Printf，它需要一个格式字符串和参数。如果要记录包含 % 字符的字符串，你可以选择对其进行转义，或者更好地将其作为参数传递：
revel.INFO.Println("转义后的URL是：%s", url.QueryEscape("http://hello.com"))
（你也可以只使用 "%s" 作为格式字符串，但为什么不趁机提供上下文呢？）
英文:
revel.INFO.Println is like fmt.Printf, it expects a format string and arguments. To log a string that contains % characters you either need to escape it, or better pass it as an argument:
revel.INFO.Println("The escaped URL is: %s", url.QueryEscape("http://hello.com"))
(You could just use "%s" as the format string, but why not take the chance to provide context.)
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