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HairyWombat
3 years agoHelpful | Level 6
Problem downloading file using Dropbox-provided URL
Hi 1. I'm developing an app for iOS and Android. Users can enter the url of a file they would like to download. They might choose a Dropbox url like https://www.dropbox.com/s/fzv989hz5mazhqw/Repl...
- 3 years ago
Hi Greg-DB
Hey I really appreciate the effort you and the team have put in.
What I found was:
1. Yes, curl works with the url - I switched from Mac to Windows and curl worked. Bash both times.
2. Fiddler also works with the URL.
3. My published code fails using automatic redirect. It works for you - the difference may be that I'm using Microsoft Xamarin on Mac.
4. In the second redirect, Dropbox proposes https://uc012d2e25383f12de25c9db8029.dl.dropboxusercontent.com/cd/0/get/B-Dfp2veRgmAiBVuB2GBdOb2SPrjBQh9t0CkeebfBm8SdzO4_8rntEJaHCvdDqpc6-v3DZF5AGyupcRw9SOyfq8l_wlZmj63OWNOQpPgmBUcisawx6C0OptaJHDM9IoDPKvPtxaegRX8av8D36sJb1hcObvW7harZlcWcGjIqXz0aw/file?dl=1# -- which strictly speaking is not a valid url because of the trailing #.
5. I solved the problem by handling the redirects myself and url-encoding the #.
So, Xamarin could do better. But also, Dropbox really should not be sending invalid urls. 🙂
Code below fyi.
Cheers
Bill
----------------------
httpClientHandler = new HttpClientHandler{AllowAutoRedirect = false};----------------------
try{// Here change ?dl=0 to ?dl=1 *****// webUrl = "https://www.howsmyssl.com/a/check"; // Debug - to check TLS version. It is TLS 1.2. (June 2023)HttpResponseMessage response = await httpClient.GetAsync ( webUrl );int redirectCount = 0;while ( redirectCount < 20 ){if ( response.StatusCode == HttpStatusCode.Redirect ){string redirectUrl;if ( response.Headers != null && response.Headers.Location != null ){if ( response.Headers.Location.IsAbsoluteUri )redirectUrl = response.Headers.Location.AbsoluteUri;else{string[] splits = webUrl.Split ('/' );redirectUrl = "https://" + splits [2] + response.Headers.Location.OriginalString;}redirectUrl = redirectUrl.Replace ( "#", "#".UrlEncode () );response = await httpClient.GetAsync ( redirectUrl );if ( response.StatusCode != HttpStatusCode.Redirect )break;}redirectCount++;}}using ( MemoryStream memoryStream = new MemoryStream () ){using ( Stream stream = await response.Content.ReadAsStreamAsync () ){stream.CopyTo ( memoryStream );}memoryStream.Seek ( 0, SeekOrigin.Begin );bytes = memoryStream.ToArray ();}return bytes;}catch ( Exception ex ){// ...}}----------------------
HairyWombat
3 years agoHelpful | Level 6
Further info:
I tried with a file that sin the Dropbox root folder, but it didn't help.
Here is the html string that I am receiving (Error 400):
<!DOCTYPE html>
<html>
<head><meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Dropbox - 400</title>
<link href="https://cfl.dropboxstatic.com/static/metaserver/static/css/error.css" rel="stylesheet" type="text/css"/>
<link rel="shortcut icon" href="https://cfl.dropboxstatic.com/static/images/favicon.ico"/>
</head>
<body>
<div class="figure">
<img src="https://assets.dropbox.com/www/en-us/illustrations/spot/target-miss.svg" alt="Error: 400"/>
</div>
<div id="errorbox">
<h1>Error (400)</h1>Something went wrong. Don't worry, your files are still safe and the Dropbox team has been notified. Check out our <a href="https://status.dropbox.com">Status Page</a> to see if there is a known incident, our <a href="https://www.dropbox.com/help">Help Center</a> and <a href="https://forums.dropbox.com">forums</a> for help, or head back to <a href="https://www.dropbox.com/home">home</a>.
</div>
</body>
</html>
Здравко
3 years agoLegendary | Level 20
Hi HairyWombat,
On my side it works as expected:
curl -L https://www.dropbox.com/s/fzv989hz5mazhqw/ReplacementDatabase.dbf?dl=1 > Test1.dbf
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 17 0 17 0 0 2 0 --:--:-- 0:00:06 --:--:-- 4
100 363 100 363 0 0 52 0 0:00:06 0:00:06 --:--:-- 52
100 671k 100 671k 0 0 68064 0 0:00:10 0:00:10 --:--:-- 267kAs expected, there are 3 transactions - 2 redirections and the last one is actual download. You can try verbose output (flag v) for more info:
curl -Lv https://www.dropbox.com/s/fzv989hz5mazhqw/ReplacementDatabase.dbf?dl=1 > Test1.dbf
Here - in the detailed output, you should be able see what's going wrong on your side.
Good luck.
Add: A trick code that works for me:
namespace Dropbox
{
using System;
using System.IO;
using System.Net;
internal class Program
{
static void Main(string[] args)
{
if (args.Length != 1) {
Console.WriteLine(
"Expected one Dropbox URL as a single command parameter!");
return;
}
//"https://www.dropbox.com/s/fzv989hz5mazhqw/ReplacementDatabase.dbf?dl=1";
string webUrl = args[0];
var request = WebRequest.Create(webUrl);
var response = request.GetResponse();
var ContentDisposition = response.Headers["Content-Disposition"];
var dispositions = ContentDisposition.Split(';');
string fileName = "Test.bin"; // default name
string disposeName = "filename";
var disposeLength = disposeName.Length;
for(int i = 0; i < dispositions.Length; ++i) {
var disposition = dispositions[i].Trim();
if (string.Compare(disposition, 0,
disposeName, 0, disposeLength, true) == 0) {
if (string.Compare(disposition, disposeLength, "=\"", 0, 2) == 0
&& disposition[disposition.Length-1] == '"')
fileName = disposition.Substring(disposeLength + 2,
disposition.Length - disposeLength - 3);
else if (string.Compare(disposition, disposeLength,
"*=UTF-8''", 0, 9) == 0)
fileName = disposition.Substring(disposeLength + 9);
}
}
Console.WriteLine("fileName: " + fileName);
var ContentLength = response.ContentLength;
Console.WriteLine("ContentLength: " + ContentLength);
FileStream fs = new FileStream(fileName, FileMode.Create,
FileAccess.Write);
int bufLength = Math.Min((int)ContentLength, 0x10000);
var buffer = new byte[bufLength];
var readStream = response.GetResponseStream();
int readed = readStream.Read(buffer, 0, bufLength);
int consumed = 0;
while(readed > 0) {
consumed += readed;
fs.Write(buffer, 0, readed);
readed = readStream.Read(buffer, 0, bufLength);
}
readStream.Close();
fs.Close();
Console.WriteLine("Downloaded: " + consumed);
}
}
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