Http multipart request using Google Drive API - google-api

Question

I am trying to send HTTP multipart request using Google Drive API to insert file in Google Drive.
I am following the link below : Multipart upload
However, I am getting a Bad request error.
Below is the request string which I have created using the documentation link above:
String content = '\r\n--' + boundary + '\r\n';
content +='Content-Type: '+'application/json; charset=UTF-8'+'\r\n\r\n';
content +='{' + '\r\n';
content +='"title": "My File"'+'\r\n';
content +='}'+'\r\n\r\n';
content += '--'+boundary + '\r\n';
content +='Content-Type: '+'text/plain'+'\r\n';
content += EncodingUtil.base64Encode(b)+'\r\n';
content += '-'+boundary+'-\r\n';
Please can someone tell me what I am missing here ??

Answer 1

I was having trouble with this as well,
but if you look at the code for the google drive API on github:
Github Drive API
The request parameters accept a media object, which can have a body and mimeType.
I was working with a service account, and this lets you upload files directly to drive.
auth.getApplicationDefault(function(err, authClient) {
if (err) {
console.log('Authentication failed because of ', err);
return;
}
if (authClient.createScopedRequired && authClient.createScopedRequired()) {
var scopes = ['https://www.googleapis.com/auth/drive'];
authClient = authClient.createScoped(scopes);
}
var request = {
project: "YOUR_PROJECT",
auth: authClient,
resource: {
parents: ['blah']
},
media: {
body: 'hi',
mimeType: 'text/plain'
}
};
drive.files.create(request, function(err, result) {
if (err) {
console.log(err);
} else {
console.log(result);
}
});
});

Answer 2

I had this problem too and after trying some changes I finally reached a working example:
Header :
POST /upload/drive/v2/files?uploadType=multipart&access_token=ya29.CjAmA2j6eonCiROaNum-V1cWdFVH2vXpNiXAsXK6iLPu7K54tD4uNsmH-eEycMcnaBE HTTP/1.1
Host: www.googleapis.com
Accept: */*
Content-Type: multipart/related; boundary="foo_bar_baz"
Content-Length: 150
remember to add boundary="foo_bar_baz" in Content-Type field
Body :
--foo_bar_baz
Content-Type: application/json; charset=UTF-8
{
"title": "My File"
}
--foo_bar_baz
Content-Type: text/txt
JPEG data
--foo_bar_baz--