UnityWebRequest POST to PHP not work

Question

I use documentation with WWWForm: https://docs.unity3d.com/Manual/UnityWebRequest-SendingForm.html

C#:

void Start() {
    StartCoroutine(Upload());
}

IEnumerator Upload(){
    yield return Upload1();
    yield return Upload2();
}

IEnumerator Upload1() {
    List<IMultipartFormSection> formData = new List<IMultipartFormSection>();
    formData.Add( new MultipartFormDataSection("field1=foo&field2=bar") );
    //formData.Add( new MultipartFormFileSection("my file data", "myfile.txt") );

    UnityWebRequest www = UnityWebRequest.Post(url, formData);
    yield return www.SendWebRequest();

    if(www.isNetworkError || www.isHttpError) {
        Debug.Log(www.error);
    }
    else {
        Debug.Log("Form upload complete!");
        Debug.Log( "MULTIPART: " + www.downloadHandler.text );
    }
}

IEnumerator Upload2() {
    WWWForm form = new WWWForm();
    form.AddField("myField", "myData");

    UnityWebRequest www = UnityWebRequest.Post(url, form);
    yield return www.SendWebRequest();

    if(www.isNetworkError || www.isHttpError) {
        Debug.Log(www.error);
    }
    else {
        Debug.Log("Form upload complete!");
        Debug.Log( "WWWForm: " + www.downloadHandler.text );
    }
}

PHP:

<?php 

    echo "POST: ";
    print_r( $_POST );
    var_dump( $_POST );

    echo "GET: ";
    print_r( $_GET );
    var_dump( $_GET );

?>

Response (MULTIPART and WWWForm):

POST: Array
(
)
array(0) {
}
GET: Array
(
)
array(0) {
}

$_POST is empty... (that's my problem)

Use Unity 2017.3.

I used UnityWebRequest.Send (Unity 5.6) before and it worked for me until it became obsolete.

Thanks.

I am also facing the issue and had been wondering whether the problem is with my code. But everything looks fine. Were you able to resolve it? — Neeraj Jaiswal, Feb 14 '18 at 05:04

score 7 · Accepted Answer · answered Feb 14 '18 at 05:29

7

This seems to work for me, I hope it helps.

UnityWebRequest www = UnityWebRequest.Post(url, formData);

www.chunkedTransfer = false;////ADD THIS LINE

yield return www.SendWebRequest();

answered Feb 14 '18 at 05:29

Neeraj Jaiswal

216
1
4

This works for WWWForm (Multipart... does not work). Thank you. – Sergey Feb 17 '18 at 16:06
I have searched *all* day for an answer to this, thank you! – darksinge Apr 04 '18 at 03:43
1

Can somebody expand more one why this works? Especially because it seemed to work fine without it in the past... – shaneparsons May 02 '18 at 18:35

score 1 · Answer 2 · answered Sep 15 '18 at 09:16

Right now I'm trying the same thing and since WWW class and WWWForm will be deprecated in the next version I tried to found a solution to this problem that does not use the deprecated class. In the end I understand that you don't actually need to use List if you just need to send a form with strings (example, right now I'm using it for a http post for code-flow auth in dropbox). Just use a Dictionary and you'll be fine (you will not even need to use www.chunkedTransfer = false;).

Dictionary<string, string> form = new Dictionary<string, string>();
form.Add("code", token);
form.Add("grant_type", "authorization_code");
form.Add("client_id", myid);
form.Add("client_secret", mysecret);
form.Add("redirect_uri", "http://" + localhost + ":" + port + '/');

score 0 · Answer 3 · answered Feb 05 '18 at 19:28

0

Use WWWForm instead. PHP is expecting application/x-www-form-urlencoded form data, not multipart.

WWWForm form = new WWWForm();
form.AddField("myField", "myData");

UnityWebRequest www = UnityWebRequest.Post(url, form);

answered Feb 05 '18 at 19:28

Tom Mettam

2,903
1
27
38

I used both VVVForm and IMultipartFormSestion - the result is the same. In the Unity version 5.6 this worked, but with the Send method (which is now obsolete). Now the Send method does not work either. In any case, I need to send POST with the file (which also worked before). Thank you. – Sergey Feb 05 '18 at 20:55

score 0 · Answer 4 · answered Dec 03 '19 at 20:08

I tried all of the above answers and nothing worked, but I noticedd that Unity adds a Request Header :

upgrade-insecure-requests  1

So I upgraded my url to https://

It still didn't work with MultipartFormData, but it started working with WWWForm form = new WWWForm();

UnityWebRequest POST to PHP not work

$_POST is empty... (that's my problem)

4 Answers4

Linked