How Do `@RequestParam` and `@PathVariable` Differ in Handling Special Characters in Spring Web Requests?

Distinguishing @RequestParam and @PathVariable in Handling Special Characters

When utilizing Java Spring annotations for handling web requests, @RequestParam and @PathVariable serve distinct purposes in parameter binding. However, they differ significantly in their behavior towards special characters.

In the case of @RequestParam, special characters such as ' ' are interpreted in the URI as spaces. For instance, the URI http://example.com/?name=John Doe will result in the name parameter being bound as "John Doe" with a space character. This behavior aligns with the traditional convention of encoding spaces as ' ' in URIs.

Contrarily, @PathVariable does not interpret special characters as spaces, but treats them as literal elements. Using the same example, the URI http://example.com/user/John Doe will result in the user parameter being bound as "John Doe", retaining the ' ' character as part of the value. This is because @PathVariable focuses on extracting placeholders from the URI, considering them as literal components rather than encoded parameters.

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