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Is %3B treated differently to %3b in an URL?
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Google's John Mueller clarifies that URLs are case sensitive, so it matters whether the characters are uppercase or lowercase. Variations in cases can make one URL different from another, similar to how a URL with a trailing slash is different from a URL without the slash.
A space is assigned number 32, which is 20 in hexadecimal. When you see “%20,” it represents a space in an encoded URL, for example, http://www.example.com/products%20and%20services.html.
When convenient, lowercase letters are preferred in URI paths since capital letters can sometimes cause problems. RFC 3986 defines URIs as case-sensitive except for the scheme and host components. This URI is fine.
Percent-encoding is a mechanism to encode 8-bit characters that have specific meaning in the context of URLs. It is sometimes called URL encoding. The encoding consists of substitution: A '%' followed by the hexadecimal representation of the ASCII value of the replace character.
No, URL percent-encoding is NOT case sensitive. According to RFC 3986:
2.1. Percent-Encoding
[...]
The uppercase hexadecimal digits 'A' through 'F' are equivalent to the lowercase digits 'a' through 'f', respectively. If two URIs differ only in the case of hexadecimal digits used in percent-encoded octets, they are equivalent.
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