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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...
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 ){// ...}}----------------------
I mean, when the path to the file is unknown.
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