I had some issues in “Recipient address required” Error 400, when working with Gmail API

问题

I resolved it and it's quite easy, Gmail has provided a very fine way to do it.

I am writing this article because when I was stuck in this situation there was no answer for it in basic HTTP Request, there were articles for JavaScript, Ruby, etc.., but I read from it and understood the concept,

This article will give a lamen understanding, so you can further implement it in any language.

I am a beginner and if any mistake or further improvement which can be done please inform.

To send a DRAFT

Create a DRAFT with:

URL: POST-https://www.googleapis.com/gmail/v1/users/userId/drafts

Where userId belongs to your email Id

Example: POST-https://www.googleapis.com/gmail/v1/users/example123@gmail.com/drafts

BODY:

{
"message":{
"raw":"Base64 Encoded Value"
}
}

Suppose you want to send Email to example123@gmail.com then String will be: To: example123@gmail.com

Now encode it in base64 format, VG86IGV4YW1wbGUxMjNAZ21haWwuY29t Now your body for the request will be,

BODY:

{
"message":{
"raw": "VG86IGV4YW1wbGUxMjNAZ21haWwuY29t"
}
}

You can do it with any Base64 converter online, I used https://www.base64encode.net/

Now execute it...

When you execute it, You will get Id of the Draft and many other things with it as a Response. For verification of creation of Draft go to your given account and check the increment in the Draft list.

You can get the Response as:

{
  "id": string,
  "message": users.messages Resource
}

Get that Id of the DRAFT, now time to send it...

To send the created DRAFT do the following things:

Use the URL: POST https://www.googleapis.com/gmail/v1/users/userId/drafts/send
Use BODY:

      {
           "id":"The Id Which you got from the Response when you created the DRAFT"
      }

Example if you got Id from the Response as: xyz-2044837380038622546

Then BODY will be as:

      {
           "id":"xyz-2044837380038622546"
      }

If you didn't supply the raw or forgot it to do it then you can write it while sending the message too...like:

      {
           "id":"xyz-2044837380038622546",
           "message":
             {
               "raw": "VG86IGV4YW1wbGUxMjNAZ21haWwuY29t"
             }

      }

And execute the same... Now the Draft which you created will be sent, you can do the same for sending message too, with some modifications...

来源：https://stackoverflow.com/questions/58909602/i-had-some-issues-in-recipient-address-required-error-400-when-working-with-g

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