URL encoding converts characters into a format that can be transmitted over the Internet.
Web browsers request pages from web servers by using a URL.
The URL is the address of a web page, like: http://www.qctutorials.com.
URLs can only be sent over the Internet using the ASCII character-set.
Since URLs often contain characters outside the ASCII set, the URL has to be converted into a valid ASCII format.
URL encoding replaces unsafe ASCII characters with a "%" followed by two hexadecimal digits.
URLs cannot contain spaces. URL encoding normally replaces a space with a + sign.
The ASCII device control characters %00-%1f were originally designed to control hardware devices. Control characters have nothing to do inside a URL.
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