Axios 拦截器重试发送 FormData

Question

我正在尝试为包含 FormData 作为数据的请求创建“重试”功能。重试发生在 JWT 令牌过期时，我的第二个请求（重试请求）不包含任何数据。

想法：

const axiosInstance = axios.create();

  /**
   * Before each request, we'll add a possible retry if the
   * request need a refreshed token
   */
  axiosInstance.interceptors.request.use((request) => {
    if (typeof _.get(request, ['retried']) === 'undefined') {
      request.retried = false;
    }

    return request;
  });

/**
   * After a request with an error, we'll check if the error is a token not refreshed.
   * If we didn't already tried to refresh, we'll just fallback to the errorHandler function
   */
  axiosInstance.interceptors.response.use(null, async (error) => {
    const statusCode = _.get(error, ['response', 'data', 'statusCode']);
    const message = _.get(error, ['response', 'data', 'message']);
    const { config: request = {} } = error;

    if (statusCode === 401 && !request.retried) {
      try {
        const newTokens = await refreshTokens();
        request.retried = true;
        _.set(request, ['headers', 'authorization'], newTokens.accessToken);
        return axiosInstance.request(request);
      } catch (e) {
        return error;
      }
    }
    return error;
  });

要求：

  const formData = new FormData();
  formData.append('name', name);
  formData.append('file', fs.createReadStream(file.path));

  axiosInstance.post(
      'http://localhost/upload',
      formData,
      {
        headers: {
          ...formData.getHeaders(),
          authorization: tokens.accessToken
        }
      }
    );

如果我的令牌过期，请求将失败，然后拦截器将刷新我的令牌，并使用新的 header Authorization 重试完全相同的请求。然而，在服务器端，接收到的负载始终为空。

Answer 1

据我所知，重试时需要重新添加formData（我认为是由于数据被添加为流并在请求期间被消耗，所以新的重试不能消耗已经消耗的流）。

你可以看看request.data明白我的意思。

Answer 2

您可以在配置参数中传递表单数据：

axiosInstance.post(
  'http://localhost/upload',
  {},
  {
    data: formData, // <---- pass it here
    headers: {
      ...formData.getHeaders(),
      authorization: tokens.accessToken
    }
  }
);

Axios 拦截器重试发送 FormData

Axios interceptor to retry sending FormData

javascript

interceptor

axios