UnityWebRequest and image upload

[jmansa]

Hi,

I am trying to use uploadcare.com to manage and save pictures taking from within the app using a phones camera, but am struggling a bit to make create the upload form work.

Here is what I have so far:

// Encode texture into PNG
byte[] bytes = testImage.EncodeToPNG();
string encodedImage = Convert.ToBase64String(bytes);

// Create a Web Form
WWWForm form = new WWWForm();
form.AddField("UPLOADCARE_PUB_KEY", "xxxxxxxxxxxxxxxxxxxx");
form.AddField("UPLOADCARE_STORE", "1");
form.AddField("testfile.png", encodedImage);

using (UnityWebRequest www = UnityWebRequest.Post("https://upload.uploadcare.com/base/", form))
{
    yield return www.SendWebRequest();

    if (www.result != UnityWebRequest.Result.Success)
    {
        Debug.Log(www.error);
    }
    else
    {
        Debug.Log("Form upload complete!");
    }
}

The documentation from uploadcare looks like this:

{
  "UPLOADCARE_PUB_KEY": "YOUR_PUBLIC_KEY",
  "UPLOADCARE_STORE": "auto",
  "my_file.jpg": "@my_file.jpg"
}

It says in the documentation that the file should be: string

When running my UnityWebRequest I only get a 400 Bad Request back in the www.error?!?

Q: How can I get the full error response?
Q: Am i missing something in my understading of UnityWebRequest forms and the documentation?

Hoping for help and thanks in advance

[Aurimas-Cernius]

WWWForm is not JSON, it’s an old school HTML form. Your server requires JSON.

[Kurt-Dekker]

Here is the best way to reason about any networking issue:

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

Using Unity for subscription lists

As with all network code, get it working with Postman or curl first. That makes it NOT a Unity problem. Solve the networking first. You must solve that or anything else is irrelevant. Once you have that working, then try and port it to UnityWebRequest. If it still doesn't work, one handy debug solution is to hook up a proxy like Charles and compare the functioning output from Postman / curl to the output from Unity, and from that reason about where your issues are.

Unity web request acting stupid.

Always get network stuff working outside of Unity in either curl or PostMan, then connect a proxy such as Charles and start trying to replicate the traffic shape with UnityWebRequest. Any other way risks wasting a lot of your time for trivial issues that only the above way will instantly reveal.

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

Using Charles Proxy with Unity

[dogmachris]

@jmansa

Hi,

I am trying to use uploadcare.com to manage and save pictures taking from within the app using a phones camera, but am struggling a bit to make create the upload form work.

Here is what I have so far:

// Encode texture into PNG
byte[] bytes = testImage.EncodeToPNG();
string encodedImage = Convert.ToBase64String(bytes);

// Create a Web Form
WWWForm form = new WWWForm();
form.AddField("UPLOADCARE_PUB_KEY", "xxxxxxxxxxxxxxxxxxxx");
form.AddField("UPLOADCARE_STORE", "1");
form.AddField("testfile.png", encodedImage);

using (UnityWebRequest www = UnityWebRequest.Post("https://upload.uploadcare.com/base/", form))
{
    yield return www.SendWebRequest();

    if (www.result != UnityWebRequest.Result.Success)
    {
        Debug.Log(www.error);
    }
    else
    {
        Debug.Log("Form upload complete!");
    }
}

The documentation from uploadcare looks like this:

{
  "UPLOADCARE_PUB_KEY": "YOUR_PUBLIC_KEY",
  "UPLOADCARE_STORE": "auto",
  "my_file.jpg": "@my_file.jpg"
}

It says in the documentation that the file should be: string

When running my UnityWebRequest I only get a 400 Bad Request back in the www.error?!?

Q: How can I get the full error response?
Q: Am i missing something in my understading of UnityWebRequest forms and the documentation?

Hoping for help and thanks in advance

APIs causing headaches… It’s like they’re playing a game of “who can make the developers suffer the most”!

Anyway, to answer your questions:

• Have you tried using www.downloadHandler.text instead of www.error. It might give you a more detailed message about what went wrong.

• As for missing something in your understanding of UnityWebRequest forms and the documentation - well, I’m not sure that’s even possible. The documentation is probably as clear as mud.