Google Apps Script UrlFetchApp returning Unauthorized Error 401 not working-CodePudding

I'm trying to send and email using a Google Doc. This is the code I'm using:

function sendHTMLtemp(){
const id = '1HC3ADjGE24ShOXeK_CYISGGIV7U0scJeXQ8o9oyu6vY';
const url = 'https://docs.google.com/document/d/' id '/export?format=html';
const param ={
  mehtod : "get",
  headers : {
    "Authorization":"Bearer " ScriptApp.getOAuthToken()
  },
  muteHttpExceptions:true
 }
const html = UrlFetchApp.fetch(url,param);
Logger.log(html)
}

But I get this error "Unauthorized Error 401.":

<HTML>
<HEAD>
<TITLE>Unauthorized</TITLE>
</HEAD>
<BODY BGCOLOR="#FFFFFF" TEXT="#000000">
<H1>Unauthorized</H1>
<H2>Error 401</H2>
</BODY>
</HTML>

CodePudding user response：

When I saw your script, if your Google Apps Script has only your showing script, I think that the scope is only https://www.googleapis.com/auth/script.external_request. If my guess is correct, I think that in your current situation, the scope might be insufficient. So, please modify your script as follows.

Modified script:

function sendHTMLtemp() {
  const id = '1HC3ADjGE24ShOXeK_CYISGGIV7U0scJeXQ8o9oyu6vY';
  const url = 'https://docs.google.com/document/d/'   id   '/export?format=html';
  const param = {
    mehtod: "get",
    headers: {
      "Authorization": "Bearer "   ScriptApp.getOAuthToken()
    },
    muteHttpExceptions: true
  }
  const html = UrlFetchApp.fetch(url, param);
  Logger.log(html)

  // DriveApp.getFiles(); // <--- This comment line is used for automatically detecting the scope of "https://www.googleapis.com/auth/drive.readonly" by the script editor. So, please don't remove this comment.
}

In this modification, a comment line of // DriveApp.getFiles(); is used. This comment line is used for automatically detecting the scope of https://www.googleapis.com/auth/drive.readonly by the script editor. By this, your error can be removed. So, please don't remove this comment.
When this modified script is run, a dialog for authorizing the scopes is opened. So, please authorize the scopes. By this, the script is run.
I think that in your situation, the scopes can also be set to the manifest file (appsscript.json). But, in this case, the scopes are fixed. I thought that this might not be suitable for your situation. So, I proposed to use the automatic detection of scopes by the script editor.