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Split a URL's query string into key/value pairs and decode each one.
Inspect every part of a URL: scheme, host, path, query, fragment.
Build application/x-www-form-urlencoded bodies from key/value input.
Slash-aware path encoding that preserves URL structure.
Check whether a string is a valid URL and explain why if it isn't.
Construct a clean URL from parts — automatic encoding where needed.
Real-world examples: query strings, percent-encoded paths, edge cases.