问题

我需要通过将结果流式传输到CSV文件来从端点下载查询结果。这是为了支持一次通过浏览器发送大量结果集。

有没有办法在React App的上下文中使用Axios来完成此任务？

我看过fetch（），知道它具有以下特征：

• 返回ReadableStream
• IE11不支持
• 不允许拦截请求
• 响应的 状态 与请求本身有关，与HTTP状态无关
  • 这意味着接收错误的唯一方法是使流过早结束时出现问题
  • 这绝对对我不起作用，因为我具有与用户权限相关的自定义错误处理

除ReadableStream响应类型外，其他所有列出的特征都是不允许的。我将需要支持IE11，并允许拦截请求/读取HTTP状态以确定如何处理流量。

范例fetch：

      // The promise returned by `fetch` rejects if the fetch was unable to make HTTP-request
      //  e.g. network problems, or there’s no such site.
      // Abnormal HTTP-statuses, such as 404 or 500 do not cause an error.
      const results = await fetch(`${URL}/data`, {
        method: 'post', // HTTP POST to send query to server
        headers: {
          Accept: 'application/json, text/plain, */*', // indicates which files we are able to understand
          'Content-Type': 'application/json', // indicates what the server actually sent
        },
        body: JSON.stringify(query), // server is expecting JSON
        credentials: 'include', // sends the JSESSIONID cookie with the address
      }).then(res => res.json()) // turn the ReadableStream response back into JSON
        .then((res) => {
          if (res.ok) {
            // boolean, true if the HTTP status code is 200-299.
            console.log('response.ok!');
          } else if (res.status === 401) {
            throw Error(`You are not authenticated. Please login.`);
          } else if (res.status === 403) {
            throw Error(`You are not authorized to access this data.`);
          } else {
            throw Error(`Request rejected with status ${res.status}`);
          }
        })
        .catch((error) => {
          // catches error case and if fetch itself rejects
          error.response = {
            status: 0,
            statusText:
              'Cannot connect. Please make sure you are connected to internet.',
          };
          throw error;
        });

      console.log(results);

示例axios（不流式传输）

Axios实例

import ...
const Api = axios.create({
  baseURL: `${URL}`,
  withCredentials: true,
});

// attach interceptors to requests and responses
// these are defined elsewhere and imported
Api.interceptors.request.use((request) => requestHandler(request));
Api.interceptors.response.use((response) => successHandler(response), (error) => errorHandler(error));

export default Api;

Axios请求

const query = {"selections":{"TABLE_A":["COLUMN1"]},"filters":[{"predicates":[]}],"joins":[],"sorts":[],"limit":100,"offset":0}
const response = await Api.post('/data', query);
// further transformations to response to get formatted csv results required

关于Axios的问题

• ReadableStream在Axios中是否可能有和相同的商品fetch？
• 仅当假定Node将在仅服务器端设置中支持Axios时，才可以在Axios中进行流传输吗？
  • 像网站这似乎说，使用responseType: 'stream'是不是可以在浏览器中完成，只能用Node.js的使用fs
• 是否可以fetch与Axios结合使用或其他？