如何使用node.js中的請求在multipart formData中發送對象

Question

我試圖制定一個POST使用要求 ，但我一直收到錯誤任何時候我嘗試加入to反對formData 。

var fs      = require('fs');
var request = require('request');
var file    = './test/assets/test.pdf';

var opts = {
  url: 'my_service',
  method: 'POST',
  auth: { user: 'username', password: 'password' },
  json: true,
  formData: {
    front: fs.createReadStream(file),
    to: {
      name: 'joe bob',
      address_1: '123 main st',
      ...
    }
  }
};

request(opts, function(err, resp, body) {
  console.log(err, body);
});

這是錯誤：

/sandbox/project/node_modules/request/node_modules/combined-stream/node_modules/delayed-stream/lib/delayed_stream.js:33
  source.on('error', function() {});
         ^
TypeError: undefined is not a function
    at Function.DelayedStream.create (/Users/me/sandbox/project/node_modules/request/node_modules/combined-stream/node_modules/delayed-stream/lib/delayed_stream.js:33:10)
    at FormData.CombinedStream.append (/Users/me/sandbox/project/node_modules/request/node_modules/combined-stream/lib/combined_stream.js:43:37)
    at FormData.append (/Users/me/sandbox/lproject/node_modules/request/node_modules/form-data/lib/form_data.js:43:3)
    at appendFormValue (/Users/me/sandbox/project/node_modules/request/request.js:466:21)
    at Request.init (/Users/me/sandbox/project/node_modules/request/request.js:477:11)
    at new Request (/Users/me/sandbox/project/node_modules/request/request.js:264:8)
    at request (/Users/me/sandbox/project/node_modules/request/index.js:50:10)
    at Object.<anonymous> (/Users/me/sandbox/project/test.js:30:1)
    at Module._compile (module.js:460:26)
    at Object.Module._extensions..js (module.js:478:10)

如果我刪除to對象，一切正常。

這是為什么 - 我做錯了什么？

Answer 1

formData屬性不處理作為值傳入的對象 。 看文檔 。 解決方案是使用JSON.stringify

var fs      = require('fs');
var request = require('request');
var file    = './test/assets/test.pdf';

var toObj = {
  name: 'joe bob',
  address_1: '123 main st',
  ...
};
var opts = {
  url: 'my_service',
  method: 'POST',
  auth: { user: 'username', password: 'password' },
  json: true,
  formData: {
    front: fs.createReadStream(file),
    to: JSON.stringify(toObj)
  }
};

request(opts, function(err, resp, body) {
  console.log(err, body);
});

注意：它實際上是僅支持字符串的表單數據包。 請求使用表單數據。 這是他們的使用文檔 ，提到使用“字符串，緩沖區和文件流”。

Answer 2

我在使用請求模塊時遇到了類似的問題，其中一切正常，直到我向'formData'添加了一個新行。 對我來說唯一有用的是創建一個字符串，該字符串將構成請求之外的POST主體，並使用'body'而不是'formData'傳遞它。

var postBody = "post body content";

request({
  method: "POST",
  uri: "my_service",
  auth: { user: 'username', password: 'password' },
  body: '{' + postBody + '}',
  ...
}).on("error", function(error){
  ...
};