Uploading File to Server from Android

Pepn · Nov 24, 2021

Hello guys,

I am uploading a .csv file to a webserver I host, running this on the computer works fine. However, when running this on Android the uploaded file is 0kb. Does anyone have any idea why this is?

Thanks in advance,

Code (CSharp):

IEnumerator Upload(string file)

{

uploadStatus = UploadStatus.started;

string path = Application.persistentDataPath + "/results/Test.csv";

FileStream filestream;

if (File.Exists(path)) filestream = File.OpenRead(path);

else

{

Debug.LogError("File not found");

}

Debug.Log("Uploading File to Path: " + path);

WWWForm form = new WWWForm();

UnityWebRequest dataFile = UnityWebRequest.Get(path);

yield return dataFile.SendWebRequest();

form.AddBinaryData("dataFile", dataFile.downloadHandler.data, path, "text/csv");

UnityWebRequest req = UnityWebRequest.Post(uploadLink, form);

yield return req.SendWebRequest();

uploadStatus = UploadStatus.completed;

Debug.Log("SERVER: " + req.downloadHandler.text); // server response

if (req.isHttpError || req.isNetworkError || !(req.downloadHandler.text.Contains("FILE OK")))

uploadStatus = UploadStatus.error;

else

uploadStatus = UploadStatus.successful;

yield break;

}

Aurimas-Cernius · Nov 24, 2021

The simplest way to do it is by using UploadHandlerFile, have a look at this:
https://docs.unity3d.com/ScriptReference/Networking.UploadHandlerFile.html

If you wonder, why your code doesn't work, the problem that you pass file path to UnityWebRequest.Get instead of URI. You probably are on a Windows computer, so it does recognize the file path, not so on Android (or other UNIX-like system). If you pass that path to System.Uri and pass that to UnityWebRequest, it should work.
I don't understand, why you open file using File class and later read it using UnityWebRequest instead, when you can read it via stream you already have. But that's probably beside the point anyway.

Pepn · Nov 24, 2021

Thanks buddy, that worked.

As for the File class, it was a quick hacked in test if the file did exist. It seemed to be that way, but perhaps I didn't see it in the sea of debug msgs.

rathsocheat · Oct 21, 2023

Aurimas-Cernius said: ↑

The simplest way to do it is by using UploadHandlerFile, have a look at this:
https://docs.unity3d.com/ScriptReference/Networking.UploadHandlerFile.html

If you wonder, why your code doesn't work, the problem that you pass file path to UnityWebRequest.Get instead of URI. You probably are on a Windows computer, so it does recognize the file path, not so on Android (or other UNIX-like system). If you pass that path to System.Uri and pass that to UnityWebRequest, it should work.
I don't understand, why you open file using File class and later read it using UnityWebRequest instead, when you can read it via stream you already have. But that's probably beside the point anyway.
Click to expand...

I got this error: Failed to read the request form. Multipart body length limit 16384 exceeded. On my server size already [DisableRequestSizeLimit] and I test upload the same file on swagger on my api it successfully.

Kurt-Dekker · Oct 21, 2023

Compare the requests out on the wire, something must be different.

Networking, UnityWebRequest, WWW, Postman, curl, WebAPI, etc:

https://forum.unity.com/threads/using-unity-for-subscription-lists.1070663/#post-6910289

https://forum.unity.com/threads/unity-web-request-acting-stupid.1096396/#post-7060150

And setting up a proxy can be very helpful too, in order to compare traffic:

https://support.unity.com/hc/en-us/articles/115002917683-Using-Charles-Proxy-with-Unity

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