public static LinkedMultiValueMap<String, String> buildBodyParams(final String param) {
        LinkedMultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        Matcher matcher = QUERY_PARAM_PATTERN.matcher(param);
        while (matcher.find()) {
            String name = matcher.group(1);
            String eq = matcher.group(2);
            String value = matcher.group(3);
            params.add(name, Objects.nonNull(value) ? value : (StringUtils.isNotBlank(eq) ? "" : null));
        }
        return params;
    }
buildBodyParams.

@param param param.
@return the string change to linkedMultiValueMap.
shenyu-plugin/shenyu-plugin-api/src/main/java/org/apache/shenyu/plugin/api/utils/BodyParamUtils.java