Google Apps 脚本:UrlFetchApp 发布文件 [英] Google Apps Script: UrlFetchApp Post File

问题描述

我正在尝试通过 Google Apps 脚本将文件发布到 REST API.这个想法是我有一个创建 Google 文档副本的过程，我希望能够将这些新创建的文档发布到第三方系统.

I'm trying to POST a file to a REST API via Google Apps Script. The idea is that I have a process that is creating copies of a Google Doc, and I want to be able to post those newly created Docs to a third party system.

我在 UrlFetchApp 中发现我可以发送文件.但是，我在发送正确的标头值时遇到了问题.

I found in UrlFetchApp that I can send files. However, I'm having issues sending the correct header values.

我的请求看起来像这样:

My request looks like so:

var file = DriveApp.getFileById(fileId);
var body = {
  "file": file.getAs(MimeType.PDF)
};
var headers = {
  'Content-Disposition': 'attachment; filename="'+ file.getName() +'"',
  'Content-Length': file.getSize()
};

我调用 UrlFetchApp.fetch(url, options) 时的选项如下:

My options when I call UrlFetchApp.fetch(url, options) looks like :

({
  method:"POST", 
  headers:{
      'Content-Disposition':"attachment; filename="My Merge Development_row_1.pdf"", 
      'Content-Length':90665, 
       Authorization:"Bearer TOKEN"
  }, 
  contentType:"application/x-www-form-urlencoded", 
  muteHttpExceptions:true, 
  payload:{file:Blob}
})

我将文件发送到的 API 需要 'Content-Length' 标头.但是，当我尝试为 'Content-Length' 标头设置一个值时，我收到一个 Apps 脚本错误，"Attribute provided with invalid value: Header:Content-Length".如果我不设置 Content-Length 标头，则 API 会响应 Content-Length 和文件大小不匹配.

The API that I'm sending the files to requires the 'Content-Length' header. But, when I try to set a value for 'Content-Length' header I get an Apps Script error, "Attribute provided with invalid value: Header:Content-Length". If I don't set the Content-Length header then the API responds that the Content-Length and file size don't match.

关于如何设置 Content-Length 标头以便我可以发布文件的任何想法?

Any ideas on how I set the Content-Length header so I can POST the file?

推荐答案

有一个 现有的工单强调文档在这个问题上并不清楚

解决办法是:

将内容长度值从content-Length"名称/值对移入高级参数contentLength"的标题

Move content length value from "content-Length" name/value pair in headers to the advanced argument "contentLength"

因此在您的示例中，您的选项应如下所示

So in your example your options should look like

({
  method:"POST", 
  headers:{
      'Content-Disposition':"attachment; filename="My Merge Development_row_1.pdf"", 
       Authorization:"Bearer TOKEN"
  }, 
  contentLength: 90665,
  contentType:"application/x-www-form-urlencoded", 
  muteHttpExceptions:true, 
  payload:{file:Blob}
})

添加了一个完整的示例函数来获取如下所示的 contentLength 和 blob:

Added a full example function to get contentLength and blob shown below:

function testFilePost() {
  var file = DriveApp.getFileById(doc_id).getAs(MimeType.PDF);
  var headers = {
    'Content-Disposition': 'attachment; filename="'+ file.getName() +'"',
  };
  var options =
      {
        "method" : "post",
        "payload": file.getBytes(),
        "headers": headers,
        "contentLength": file.getBytes().length,
      };
  var result = JSON.parse(UrlFetchApp.fetch('http://httpbin.org/post', options).getContentText());
  Logger.log(result);
}

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