How does the body of the request look like when making a call to gmail api for sending an email with attachment (multipart)?

Question

Google documentation gave an example as below:

POST /upload/gmail/v1/users/userId/messages/send?uploadType=multipart HTTP/1.1 Host: www.googleapis.com Authorization: Bearer your_auth_token Content-Type: multipart/related; boundary=foo_bar_baz Content-Length: number_of_bytes_in_entire_request_body

--foo_bar_baz Content-Type: application/json; charset=UTF-8

{ "id": string, "threadId": string, "labelIds": [ string ], "snippet": string, "historyId": unsigned long, "payload": { "partId": string, "mimeType": string, "filename": string, "headers": [ { "name": string, "value": string } ], "body": users.messages.attachments Resource, "parts": [ (MessagePart) ] }, "sizeEstimate": integer, "raw": bytes }

--foo_bar_baz Content-Type: message/rfc822

Email Message data --foo_bar_baz-- If the request succeeds, the server returns the HTTP 200 OK status code along with any metadata:

HTTP/1.1 200 Content-Type: application/json

{ "id": string, "threadId": string, "labelIds": [ string ], "snippet": string, "historyId": unsigned long, "payload": { "partId": string, "mimeType": string, "filename": string, "headers": [ { "name": string, "value": string } ], "body": users.messages.attachments Resource, "parts": [ (MessagePart) ] }, "sizeEstimate": integer, "raw": bytes }

Can someone make a sample request body by looking at the above example? I need to send an email with attachment.

jess jess · Accepted Answer · 2018-09-19T05:58:52

Based from SO related post, the body request can be something like this:

var mail = [
  'Content-Type: multipart/mixed; boundary="foo_bar_baz"\r\n',
  'MIME-Version: 1.0\r\n',
  'From: [email protected]\r\n',
  'To: [email protected]\r\n',
  'Subject: Subject Text\r\n\r\n',

  '--foo_bar_baz\r\n',
  'Content-Type: text/plain; charset="UTF-8"\r\n',
  'MIME-Version: 1.0\r\n',
  'Content-Transfer-Encoding: 7bit\r\n\r\n',

  'The actual message text goes here\r\n\r\n',

  '--foo_bar_baz\r\n',
  'Content-Type: image/png\r\n',
  'MIME-Version: 1.0\r\n',
  'Content-Transfer-Encoding: base64\r\n',
  'Content-Disposition: attachment; filename="example.png"\r\n\r\n',

   pngData, '\r\n\r\n',

   '--foo_bar_baz--'
].join('');

    var response = UrlFetchApp.fetch(
        "https://www.googleapis.com/upload/gmail/v1/users/me/messages/send?uploadType=media", {
            method: "POST",
            headers: {
                "Authorization": "Bearer " + ScriptApp.getOAuthToken(),
                "Content-Type": "message/rfc822",
            },
            muteHttpExceptions: true,
            payload: mail
});

Here's also an example code from digital inspiration written by Amit Agarwal in Google Appscript. This example shows how you can easily send email messages with file attachment using Gmail API.

How does the body of the request look like when making a call to gmail api for sending an email with attachment (multipart)?

1 Answers