URL Patterns

-> A URL pattern can contain literal values and variable placeholders (referred to as URL parameters). The literals and placeholders are located in segments of the URL which are delimited by the slash (/) character.
-> When a request is made the URL is parsed into segments and placeholders and the variable values are provided to the request handler.
-> In a URL pattern, you define the placeholders by enclosing them in braces {}. You can define more than one placeholder in a segment, but they must be separated by a literal value.

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