(.NET Core C#) Insert Email into GMail Folder

Directly inserts a message into only this user's mailbox similar to IMAP APPEND, bypassing most scanning and classification. Does not send a message.

This example will create a Chilkat Email object and upload/insert it into GMail. Then adds the "INBOX" label to the email to make it appear in INBOX

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// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

Chilkat.Email email = new Chilkat.Email();

// This example chooses to load an email from a file.
bool success = email.LoadEml("qa_data/eml/testEmail.eml");
if (success != true) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

// Get the email as MIME.
Chilkat.StringBuilder sbMime = new Chilkat.StringBuilder();
email.GetMimeSb(sbMime);

Chilkat.Http http = new Chilkat.Http();
http.AuthToken = "GMAIL-ACCESS-TOKEN";

// Upload to GMail (does not send, but just inserts).

// IMPORTANT: After uploading/inserting, you won't see the message in the Inbox.
// In your web browser, if you go to "All Mail", you will see it.

string url = "https://www.googleapis.com/upload/gmail/v1/users/me/messages?uploadType=media";
bool sendGzipped = true;
Chilkat.HttpResponse resp = http.PTextSb("POST",url,sbMime,"utf-8","message/rfc822",false,sendGzipped);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// A status code of 200 indicates success.
Debug.WriteLine("Response status code: " + Convert.ToString(resp.StatusCode));
Debug.WriteLine("Response body:");
Debug.WriteLine(resp.BodyStr);

// The response body contains JSON.
// A sample successful JSON response:

// {
//  "id": "166f583051d36144",
//  "threadId": "166f5529e079a456"
// }

Chilkat.JsonObject json = new Chilkat.JsonObject();
json.Load(resp.BodyStr);
string id = json.StringOf("id");

// Add the Inbox label to the inserted email so that it appears in Inbox.
Debug.WriteLine("---- Adding the Inbox label to the newly inserted email. ----");

// Create the following JSON to be sent in a POST to modify labels for this message.
// {
//   "addLabelIds": [
//     "INBOX"
//     ]
// }

Chilkat.JsonObject json2 = new Chilkat.JsonObject();
json2.UpdateString("addLabelIds[0]","INBOX");

http.SetUrlVar("id",id);
url = "https://www.googleapis.com/gmail/v1/users/me/messages/{$id}/modify";

resp = http.PostJson3(url,"application/json",json2);
if (http.LastMethodSuccess != true) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

// A status code of 200 indicates success.
Debug.WriteLine("Response status code: " + Convert.ToString(resp.StatusCode));
Debug.WriteLine("Response body:");
Debug.WriteLine(resp.BodyStr);

// The response body contains JSON.
// A sample successful JSON response:

// {
//  "id": "166f583051d36144",
//  "threadId": "166f583051d36144",
//  "labelIds": [
//   "INBOX"
//  ]
// }