b2_get_upload_part

When you upload part of a large file to B2, you must call b2_get_upload_part_url first to get the URL for uploading. Then, you use b2_upload_part on this URL to upload your data.

An uploadUrl and upload authorizationToken are valid for 24 hours or until the endpoint rejects an upload, see b2_upload_file. You can upload as many files to this URL as you need. To achieve faster upload speeds, request multiple uploadUrls and upload your files to these different endpoints in parallel.

Request

Request HTTP Headers

Request HTTP Message Body Parameters

Response

Response HTTP Status 200

Response Errors

API Versions

v1: Application keys (July 26, 2018)

Incompatible change: After calling b2_authorize_account with an application key that does not have the right permissions, this call will return a 401 Unauthorized.

v1: Original release (September 22, 2015)

Sample Code

Code

FILE_ID=''; # Provided by b2_start_large_file
ACCOUNT_AUTHORIZATION_TOKEN=''; # Provided by b2_authorize_account
API_URL=''; # Provided by b2_authorize_account
curl \
    -H "Authorization: $ACCOUNT_AUTHORIZATION_TOKEN" \
    -d "`printf '{"fileId":"%s"}' $FILE_ID`" \
    "$API_URL/b2api/v2/b2_get_upload_part_url"

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}

Code

import java.io.*;
import java.util.*;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.json.*;

String fileId = ""; // Provided by b2_start_large_file
String accountAuthorizationToken = ""; // Provided by b2_authorize_account
String apiUrl = ""; // Provided by b2_authorize_account

// Get Upload Part URL
// Create a model
JsonObject getUploadPartJsonObj = Json.createObjectBuilder()
        .add("fileId", fileId)
        .build();

// Write the model to stream
StringWriter sw = new StringWriter();
JsonWriter jw = Json.createWriter(sw);
jsonWriter.writeObject(getUploadPartJsonObj);
jsonWriter.close();
postData = sw.toString();
try {
    URL url = new URL(apiUrl + "/b2api/v2/b2_get_upload_part_url");
    connection = (HttpURLConnection)url.openConnection();
    connection.setRequestMethod("POST");
    connection.setRequestProperty("Authorization", accountAuthorizationToken);
    connection.setRequestProperty("Content-Type", "application/json");
    connection.setRequestProperty("Charset", "UTF-8");
    connection.setRequestProperty("Content-Length", Integer.toString(postData.length()));
    connection.setDoOutput(true);
    DataOutputStream dataOutputStream = new DataOutputStream(connection.getOutputStream());
    dataOutputStream.writeBytes(postData);
    dataOutputStream.close();
    String jsonResponse = myInputStreamReader(connection.getInputStream());
    System.out.println(jsonResponse);
} catch (Exception e) {
    e.printStackTrace();
} finally {
    connection.disconnect();
}

// Input stream reader example. 
static public String myInputStreamReader(InputStream in) throws IOException {
    InputStreamReader reader = new InputStreamReader(in);
    StringBuilder sb = new StringBuilder();
    int c = reader.read();
    while (c != -1) {
        sb.append((char)c);
        c = reader.read();
    }
    reader.close();
    return sb.toString();
}

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}

Code

import base64
import json
import urllib2

file_id = "" # Provided by b2_start_large_file
request = urllib2.Request(
    '%s/b2api/v2/b2_get_upload_part_url' % api_url,
    json.dumps({ 'fileId' : file_id }),
    headers = { 'Authorization': account_authorization_token }
)
response = urllib2.urlopen(request)
response_data = json.loads(response.read())
response.close()

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}

Code

import Foundation

let apiUrl = "" // Provided by b2_authorize_account
let fileId = "" // The file ID provided by b2_start_large_file
let accountAuthorizationToken = "" // Provided by b2_authorize_account

// Create the request
var request = URLRequest(url: URL(string: "\(apiUrl)/b2api/v2/b2_get_upload_part_url")!)
request.httpMethod = "POST"
request.addValue( accountAuthorizationToken, forHTTPHeaderField: "Authorization")
request.httpBody = "{\"fileId\":\"\(fileId)\"}".data(using: .utf8)

// Create the task
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
	if let data = data {
		let json = String(data: data, encoding: .utf8)
		print("\(json!)")
	}
}

// Start the task
task.resume()

// Swift 4.1 (swiftlang-902.0.48 clang-902.0.37.1) Xcode 9.3.1 (9E501)

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}

Code

require 'json'
require 'net/http'

api_url = "" # Provided by b2_authorize_account
file_id = "" # Provided by b2_start_large_file
account_authorization_token = "" # Provided by b2_authorize_account
uri = URI.join("#{api_url}/b2api/v2/b2_get_upload_part_url")
req = Net::HTTP::Post.new(uri)
req.add_field("Authorization","#{account_authorization_token}")
req.body = "{\"fileId\":\"#{file_id}\"}"
http = Net::HTTP.new(req.uri.host, req.uri.port)
http.use_ssl = true
res = http.start {|http| http.request(req)}
case res
when Net::HTTPSuccess then
    res.body
when Net::HTTPRedirection then
    fetch(res['location'], limit - 1)
else
    res.error!
end

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}

Code

using System;
using System.Net;
using System.Text;
using System.IO;
using System.Runtime.Serialization.Json;
using System.Runtime.Serialization;

String apiUrl = ""; // Provided by b2_authorize_account
String fileId = ""; // Provided by b2_start_large_file
String authorizationToken = ""; // Provided by b2_authorize_account

// Get Upload URL
String getUploadUrlJsonStr = "{\"fileId\":\"" + fileId + "\"}";
byte[] getUloadUrlJsonData = Encoding.UTF8.GetBytes(getUploadUrlJsonStr);
HttpWebRequest getUploadUrlRequest = (HttpWebRequest)WebRequest.Create(apiUrl + "/b2api/v2/b2_get_upload_part_url");
getUploadUrlRequest.Method = "POST";
getUploadUrlRequest.Headers.Add("Authorization", authorizationToken);
getUploadUrlRequest.ContentType = "application/json; charset=utf-8";
getUploadUrlRequest.ContentLength = getUloadUrlJsonData.Length;
using (Stream stream = getUploadUrlRequest.GetRequestStream())
{
    stream.Write(getUloadUrlJsonData, 0, getUloadUrlJsonData.Length);
    stream.Close();
}

// Handle the response and print the json
try
{
    HttpWebResponse getUploadUrlResponse = (HttpWebResponse)getUploadUrlRequest.GetResponse();
	using(StringReader responseReader = new StreamReader(getUploadUrlResponse.GetResponseStream()))
    {
    	String json = responseReader.ReadToEnd();
    	Console.WriteLine(json);
    }
    getUploadUrlResponse.Close();    
}
catch (WebException e)
{
    using (HttpWebResponse errorResponse = (HttpWebResponse)e.Response)
    {
        Console.WriteLine("Error code: {0}", errorResponse.StatusCode);
        using (StreamReader reader = new StreamReader(errorResponse.GetResponseStream()))
        {
            String text = reader.ReadToEnd();
            Console.WriteLine(text);
        }
    }
}

Output

under construction

Code

<?php

$file_id = "" // Obtained from b2_start_large_file
$account_auth_token = "" // Obtained from b2_authorize_account
$data = array("fileId" => $file_id);
$post_fields = json_encode($data);

// Setup headers
$headers = array();
$headers[] = "Accept: application/json";
$headers[] = "Authorization: " . $account_auth_token;

//  Setup curl to do the post
$session = curl_init($api_url . "/b2api/v2/b2_get_upload_part_url");
curl_setopt($session, CURLOPT_HTTPHEADER, $headers);  // Add headers
curl_setopt($session, CURLOPT_POSTFIELDS, $post_fields); 
curl_setopt($session, CURLOPT_RETURNTRANSFER, true); // Receive server response
$server_output = curl_exec($session);
curl_close ($session);
print $server_output;

?>

Output

{
  "authorizationToken": "3_20160409004829_42b8f80ba60fb4323dcaad98_ec81302316fccc2260201cbf17813247f312cf3b_000_uplg",
  "fileId": "4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001",
  "uploadUrl": "https://pod-000-1016-09.backblaze.com/b2api/v2/b2_upload_part/4_ze73ede9c9c8412db49f60715_f100b4e93fbae6252_d20150824_m224353_c900_v8881000_t0001/0037"
}