private String urlDecode(final String s) {
        try {
            return URLDecoder.decode(s, StandardCharsets.UTF_8.name());
        } catch (Exception e) {
            return s;
        }
    }
parse formData to map .

@return encodedMap
shenyu-plugin/shenyu-plugin-ai/shenyu-plugin-ai-request-transformer/src/main/java/org/apache/shenyu/plugin/ai/transformer/request/template/AiRequestTransformerTemplate.java