请问参数支持空字符串传递吗

如题，我编写的接口是这样的：
```java
/**
 * 分页查询用户
 *
 * @param page  第几页
 * @param limit 查询条数
 * @param user  模糊查询参数
 * @return
 */
@GetMapping("/query-user-by-page")
@RequiresPermissions("sys:user:read")
@ApiOperation(value = "分页查询用户", notes = "分页查询用户（支持条件模糊查询）")
@ApiImplicitParams({
        @ApiImplicitParam(name = "page", value = "第几页", dataType = "int", paramType = "form", example = "1")
        , @ApiImplicitParam(name = "limit", value = "每页几条", dataType = "int", paramType = "form", example = "10")
        , @ApiImplicitParam(name = "userName", value = "用户登录名称(必填，可为空字符串)", dataType = "string", paramType = "form", allowEmptyValue = true)
        , @ApiImplicitParam(name = "userNickname", value = "用户昵称(必填，可为空字符串)", dataType = "string", paramType = "form", allowEmptyValue = true)
        , @ApiImplicitParam(name = "userPhone", value = "用户手机号码(必填，可为空字符串)", dataType = "string", paramType = "form", allowEmptyValue = true)
})
public Object queryUserByPage(Integer page, Integer limit, @ApiIgnore User user) {
    IPage<User> iPage = getUserPageBySearch(page, limit, user);
    iPage.setRecords(userService.wireUserAllInfos(iPage.getRecords(), true));
    return result.success(iPage.getRecords(), iPage.getTotal());
}
```
但在Knife4J的UI中显示是这样：
![输入图片说明](https://images.gitee.com/uploads/images/2020/0811/091038_02c1c11b_4831300.png "屏幕截图.png")

CURL中传递的空字符串参数为null，请问有什么办法能传递空字符串？

GVP 萧明/knife4j

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GVP萧明/knife4j

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