javascript - HTTP 响应中缺少 react-admin

Question

我正在尝试使用 react-admin 创建管理面板.

这是我所做的:

class AdminPanel extends React.Component{

    render() {
        return(
          <div>
              <Admin dataProvider={restProvider('http://localhost:8080')}>
                  <Resource name="u/all" list={PostList}/>
              </Admin>
          </div>
        );
    }
}

在另一个js文件中，我定义了PostList。

在我的服务器中，我正在调试 /u/all 是否受到任何打击。越来越多了。

但是react.js给了我错误，说:错误:HTTP响应中缺少Content-Range header 。简单的 REST 数据提供程序期望资源列表的响应包含此 header 以及构建分页的结果总数。如果您使用 CORS，您是否在 Access-Control-Expose-Headers header 中声明了 Content-Range？

我该如何解决这个问题？

PostList.js:

export const PostList = (props) => (

    <List {...props}>
        <Datagrid>
            <TextField source="userID" />
            <TextField source="username" />
            <DateField source="firstName" />
            <TextField source="middleName" />
            <TextField source="lastName" />
            <TextField source="profileImageURL" />
            <TextField source="joiningTime" />
            <EditButton basePath="/posts" />
        </Datagrid>
    </List>
);

我的服务器端 CORS:

@Bean
    public WebMvcConfigurer corsConfigurer() {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry
                        .addMapping("/**")
                        .allowedOrigins("http://localhost:3000","http://localhost:3001")
                        .exposedHeaders("Content-Range");
            }
        };
    }

添加公开的 header 后仍然出现错误:

Answer 1

答案写着in the react-admin documentation :

The simple REST client expects the API to include a Content-Range header in the response to getList calls. The value must be the total number of resources in the collection. This allows react-admin to know how many pages of resources there are in total, and build the pagination controls.

Content-Range: posts 0-24/319

If your API is on another domain as the JS code, you’ll need to whitelist this header with an Access-Control-Expose-Headers CORS header.

Access-Control-Expose-Headers: Content-Range