URLs are generally case-insensitive and lowercase is used only for stylistic purposes and so it doesn’t look like URLs are yelling at you.
You can still find uppercase letters in URLs.
You can change the letters to lowercase and the same page loads.
Do capital letters matter in URL?
An Internet address is only case sensitive for everything after the domain name. For example, it does not matter if you use uppercase or lowercase with “computerhope.com,” it still reaches the same page. However, when typing the name of the page, file, or directory in the URL, it is case sensitive.
Should URL be capitalized?
Even though URL is an acronym, class-naming standards dictate that acronyms in class names should be capitalized. This means that the class \Drupal\Core\Url is properly capitalized. So when documentation refers to Url objects, this is a proper capitalization and should not be modified.
Can you use capital letters in a domain name?
Answer: First of all, search engines do not place special emphasis on sites that use capital letters in their domain names. It helps the site stand out to readers and makes the domain name easier to read.
Can a URL be case sensitive?
There may be URLs, or parts of URLs, where case doesn’t matter, but identifying these may not be easy. Users should always consider that URLs are case-sensitive. Domain names are case insensitive according to RFC 4343. The rest of URL is sent to the server via the GET method.