Resumable Upload using Google Mail APIs throwing exception: "Bad Request" - c#-4.0

Question

I am trying to insert mail to Google Mailbox using GMail APIs.
I want to upload mails of size more than 5 mb. So that I am using Resumable upload request.
I have used POST request first to initiate a resumable upload which gives "200 OK" response.
Post Request:
String postUrl = "https://www.googleapis.com/upload/gmail/v1/users/" + "<username>" + "/messages/send?uploadType=resumable";
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(postUrl);
httpRequest.Headers["Authorization"] = "Bearer " + f_token;// AccessToken;
httpRequest.Headers["X-Upload-Content-Type"] = "message/rfc822";
httpRequest.Headers["X-Upload-Content-Length"] = f_bytes.Length.ToString();
httpRequest.Method = "POST";
httpRequest.ContentLength = 0;
var response = (HttpWebResponse)httpRequest.GetResponse(); // 200 OK
From that response I get location URL to upload EML.
Location: https://www.googleapis.com/upload/gmail/v1/users//messages/send?uploadType=resumable&upload_id=AEnB2UqeNYKVyyQdL07RZcbenWOqY8a2NFVIsQrbA-S-vxwUXC_W4ORQtpPx1HG6tc4Indx8AvqDjwXII3F6OW0G3wsdUMUjHw
To upload EML file I used Location URL as PUT URL to create request.
putUrl = https://www.googleapis.com/upload/gmail/v1/users/<username>/messages/send?uploadType=resumable&upload_id=AEnB2UqeNYKVyyQdL07RZcbenWOqY8a2NFVIsQrbA-S-vxwUXC_W4ORQtpPx1HG6tc4Indx8AvqDjwXII3F6OW0G3wsdUMUjHw";
HttpWebRequest httpRequest1 = (HttpWebRequest)WebRequest.Create(postUrl);
httpRequest1.Method = "PUT";
httpRequest1.ContentLength = f_bytes.Length;
int EndOffset = f_bytes.Length;//5120000;5242880
httpRequest1.Headers["Content-Range"] = "bytes " + 0 + "-" + EndOffset + "/" + f_bytes.Length;
httpRequest1.ContentType = "message/rfc822";
MemoryStream stream = new MemoryStream(f_bytes);
System.IO.Stream requestStream = httpRequest1.GetRequestStream();
{
stream.CopyTo(requestStream);
requestStream.Flush();
requestStream.Close();
}
HttpWebResponse f_webResponse = (HttpWebResponse)httpRequest1.GetResponse(); //Exception
Exception :
The remote server returned an error: (400) Bad Request.
Please suggest soluion to upload eml file in a particular folder of mailbox .

Answer 1

I am able to send mail using resumable upload.
if (f_MailService == null)
{
bool isCreated = createMailService(ref f_MailService);
}
FileStream fs = new FileStream(#p_EMLPath, FileMode.Open,FileAccess.Read);
Create HTTPRequest for sending mail :
string postUrl = "https://www.googleapis.com/upload/gmail/v1/users/ab#edu.cloudcodes.com/messages/send?uploadType=resumable";
HttpWebRequest f_httpRequest = (HttpWebRequest)WebRequest.Create(postUrl);
f_httpRequest.Headers["X-Upload-Content-Type"] = "message/rfc822";
f_httpRequest.Headers["X-Upload-Content-Length"] = fs.Length.ToString();
f_httpRequest.Headers["Authorization"] = "Bearer " + f_token;
f_httpRequest.Method = "POST";
//f_httpRequest.ContentLength = 524288;
f_httpRequest.ContentType = "application/json; charset=UTF-8";//"message/rfc822";
f_httpRequest.ContentLength = fs.Length;
f_httpRequest.Timeout = 6000000;
f_httpRequest.SendChunked = true;
Get Response for first POST request :
try
{
using (Stream f_ObjHttpStream = f_httpRequest.GetRequestStream())
{
}
}
catch (Exception EX)
{
}
try
{
using (var response = (HttpWebResponse)f_httpRequest.GetResponse())
{
// data = ReadResponse(response);
UploadUrl = response.Headers["Location"].ToString();
}
}
catch (WebException exception)
{
using (var response = (HttpWebResponse)exception.Response)
{
// data = ReadResponse(response);
}
}
Read EML File & send chunk data to upload
byte[] Arrbyte = new byte[1024];
int ReadByte = 0;
while (fs.Length > ReadByte)
{
bool ac = false;
int ByteRead = 0;
byte[] Data = new byte[4194304];
byte[] LastData;
//Read block of bytes from stream into the byte array
// if (ReadByte == 0)
{
ByteRead = fs.Read(Data, 0, Data.Length);
}
//else
{
if ((ReadByte + Data.Length) > fs.Length)
{
//fs.Length - ReadByte-
LastData = new byte[fs.Length - ReadByte];
ByteRead = fs.Read(LastData, 0, LastData.Length);
CallPUTReq(fs.Length, LastData);
ac = true;
}
}
//f_MsgRawStr = Convert.ToBase64String(f_bytes).TrimEnd(padding).Replace('+', '-').Replace('/', '_');
ReadByte = ReadByte + ByteRead;
if (ac == false)
{
CallPUTReq(fs.Length, Data);
}
//long pos = fs.Seek(0, SeekOrigin.Current );
//fs.Position = ReadByte;
}
private void CallPUTReq(long p_lenth, byte[] Arrbyte)
{
try
{
String postUrl = UploadUrl; //"https://www.googleapis.com/upload/gmail/v1/users/ab#edu.cloudcodes.com/messages/send?uploadType=resumable&upload_id=AEnB2UqZNtZVwWulAOhAVoFp-pZ-vTMcIXOpt_0dH_6jJecpm2Y1MNOGkE6JoDb0kn9Dt4yuHHMZWR--dBncxWQkZctF9h6jiPSL5uJDKeYE9Ut1c7-fImc";
int EndOffset = 0;
HttpWebRequest httpRequest1 = (HttpWebRequest)WebRequest.Create(postUrl);
httpRequest1.Method = "PUT";
httpRequest1.ContentLength = Arrbyte.Length;
if (rangeStartOffset == 0)
{
EndOffset = Arrbyte.Length - 1;
}
else
{
EndOffset = rangeStartOffset + Arrbyte.Length - 1;
if (EndOffset > p_lenth)
{
EndOffset = Convert.ToInt32(p_lenth);
httpRequest1.ContentLength = EndOffset - rangeStartOffset;
}
}//5120000;5242880
httpRequest1.Headers["Content-Range"] = "bytes " + rangeStartOffset + "-" + EndOffset + "/" + p_lenth; //"bytes */" + p_lenth; //
httpRequest1.ContentType = "message/rfc822";
httpRequest1.Timeout = 6000000;
UTF8Encoding encoding = new UTF8Encoding();
Stream stream = httpRequest1.GetRequestStream();
stream.Write(Arrbyte, 0, Arrbyte.Length);
stream.Close();
try
{
using (Stream f_ObjHttpStream = httpRequest1.GetRequestStream())
{
}
}
catch (Exception EX)
{
}
WebResponse response1 = null;
try
{
using (response1 = (HttpWebResponse)httpRequest1.GetResponse())
{
}
}
catch (Exception ex)
{
// UploadUrl = response1.Headers["Location"].ToString();
}
//4194303
rangeStartOffset = EndOffset +1;
}
catch (Exception)
{
}
}