Gmail API 返回 400 个带有批处理请求的错误请求

Question

我正在尝试向gmail发出批处理http请求（在具有Meteor/HTTP的服务器上），如下所示：

batchGetMessages = (accessToken, ids) => {
  let userId = 'me';
  let url = `https://www.googleapis.com/batch`;
  let boundary = `batch_message_request`;
  let body = ``;
  _.each(ids, (id) => {
    body = `${body}
    --${boundary}
    Content-Type: application/http
    GET /gmail/v1/users/${userId}/messages/${id.id}?format=metadata&fields=id%2Cpayload
    `
  });
  body = `${body}
    --${boundary}--`
  let options = {
    headers: {
      'Authorization': `Bearer ${accessToken}`,
      'Content-Type': `multipart/mixed; boundary="${boundary}"`,
    },
    content: body,
  };
  let data = HTTP.post(url, options);
  console.log('data: ', data);
}

正文字符串看起来像这样：

--batch_message_request
Content-Type: application/http
GET /gmail/v1/users/me/messages/15375be281102d3d?format=metadata&fields=id%2Cpayload
--batch_message_request
Content-Type: application/http
GET /gmail/v1/users/me/messages/15366f87db6bdfeb?format=metadata&fields=id%2Cpayload
--batch_message_request
Content-Type: application/http
GET /gmail/v1/users/me/messages/15365d62f152dea2?format=metadata&fields=id%2Cpayload
--batch_message_request--

我的请求总是返回 400 错误请求错误。我已经检查了类似的问题，但尚未能够使其正常工作：

在 JavaScript 中为文件上传生成 HTTP 多部分正文

Gmail REST API 批处理支持接收邮件

批处理请求 - 400 错误请求响应

任何帮助或建议将不胜感激。谢谢！

Answer 1

好吧，400 BadRequest 错误似乎是由字符串模板中的换行空格引起的。删除空格使一切正常：

...
/* 
  the lack of whitespace is impotant in the folllowing string template:
*/
  _.each(ids, (id) => {
    body = `${body}
--${boundary}
Content-Type: application/http
GET /gmail/v1/users/${userId}/messages/${id.id}? format=metadata&fields=id%2Cpayload`
  });
  body = `${body}
--${boundary}--`;
...

可能有一种更奇特的方法来维护代码缩进并消除空格，但我还没有寻找它。