Query parameters are a fundamental part of HTTP requests and Go makes it easy to extract and work with them. The r.URL.Query() method returns a url.Values map where you can retrieve parameter values by key. The Get method returns the first value for a given key, or an empty string if the key doesn’t exist.
For more advanced use cases, url.Values provides methods like Getall to retrieve all values for a parameter that might appear multiple times, and Has to check if a parameter exists. This is useful for filtering, pagination, and search functionality in web applications.
When parsing query parameters, remember that values come as strings and must be manually converted to other types if needed. Also be aware that query parameters are URL-encoded, but the url.Values type handles decoding automatically when you access values through its methods.