how to change a string to http form in ruby? such as # to %23

How to change a string to http form in ruby?

Such as # to %2开发者_运维技巧3.

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Use the CGI class to do this

 url_encoded_string = CGI::escape("'Stop!' said Fred")
     # => "%27Stop%21%27+said+Fred"

Reference http://www.ensta.fr/~diam/ruby/online/ruby-doc-stdlib/libdoc/cgi/rdoc/classes/CGI.html#M000067

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Use the Ruby Standard CGI library escape method:

require 'cgi'
CGI::escape("#") // => "%23"

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URI::escape seems to do it.

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I would suggest

URI.escape(foo, Regexp.new("[^#{URI::PATTERN::UNRESERVED}]"))

its safe to use if you also have URLs in your query params :)