pub fn json_key_unicode_escape(key: &str, value: &str) -> StringExpand description
AWS WAF JSON-pointer escape — encode every char of key as
\uXXXX so the WAF’s JSON-pointer rule (e.g. /id literal-match)
misses, while the backend JSON parser decodes the escape and
routes the value to the original field.
Returns the JSON fragment {"<key-escaped>": "<value>"} ready to
drop into a request body. Sicuranext 2024 confirmed bypass.