400 Recipient address required, when I called the API gmail with curl-CodePudding

I want to use :

curl --request POST \
'https://gmail.googleapis.com/gmail/v1/users/me/messages/send?key=[YOUR_API_KEY]' \ --header 'Authorization: Bearer [YOUR_ACCESS_TOKEN]' \ --header 'Accept: application/json' \ --header 'Content-Type: application/json' \ --data '{"raw":"","payload":{"partId":"","headers":[{"name":"MIME-Version","value":"1.0"},{"name":"Subject","value":"Subject test"},{"name":"From","value":"[email protected]"},{"name":"To","value":"[email protected], [email protected]"}]}}' \ --compressed

But I always have error like :

{ "error": { "code": 400, "message": "Recipient address required", "errors": [ { "message": "Recipient address required", "domain": "global", "reason": "invalidArgument" } ], "status": "INVALID_ARGUMENT" } }

I use Gmail for Developers > Gmail API to test it: https://developers.google.com/gmail/api/reference/rest/v1/users.messages/send

GET https://gmail.googleapis.com/gmail/v1/users/{userId}/messages/{id} => work well
GET https://gmail.googleapis.com/gmail/v1/users/{userId}/messages => work well
POST https://gmail.googleapis.com/gmail/v1/users/{userId}/messages/send => KO

Do you have any idea why this error?

CodePudding user response：

You had to base64 encode the raw content of the email so it allows to send the email. You can use this online encoder to generate the email and then encode it and submit it to the raw parameter, the parameters in your example should be like:

From: [email protected],
To: [email protected],
Subject:Gmail API test
Content-type: text/html;charset=iso-8859-1,

This is a test.

Once encoded you just need to add the result in the raw parameter like:

curl --request POST \
  'https://gmail.googleapis.com/gmail/v1/users/me/messages/send?key=[YOUR_API_KEY]' \
  --header 'Authorization: Bearer [YOUR_ACCESS_TOKEN]' \
  --header 'Accept: application/json' \
  --header 'Content-Type: application/json' \
  --data '{"raw":"RnJvbTogdGVzdEBnbWFpbC5jb20sCiAgICBUbzogdGVzdDJAZ21haWwuY29tLAogICAgU3ViamVjdDpHbWFpbCBBUEkgdGVzdAogICAgQ29udGVudC10eXBlOiB0ZXh0L2h0bWw7Y2hhcnNldD1pc28tODg1OS0xLAoKICAgIFRoaXMgaXMgYSB0ZXN0IHBsZWFzZSB3b3JrLg=="}' \
  --compressed

Then it will result in the email being sent.