application/x-www-form-urlencoded is a media type.
This type is set in the enctype attribute of a HTML form submission and is found in the body of the resulting HTTP request.
The application/x-www-form-urlencoded format is in many ways an aberrant monstrosity, the result of many years of implementation accidents and compromises leading to a set of requirements necessary for interoperability, but in no way representing good design practices.
The payload is encoded using the URL encoding.
Documentation / Reference
- The “application/x-www-form-urlencoded” media type is defined in Section 17.13.4 of W3C.REC-html401-19991224