WWW.responseHeader["STATUS"] does not exists

Question

I already asked on answers.unity3d but as there is no response I'll ask on SO too..

I'm not able to retrieve the http status of a response on the WWW object on Windows Phone 8 and Windows RT 8.1 (while it's ok on IOS/Android).

www.responseHeader["STATUS"] does not exists and the hidden field _responseHeaderString does not contain as first line

HTTP/1.1 200 OK

---

responseHeaderString :

Server: nginx
Date: Wed, 21 Oct 2015 07:44:36 GMT
Last-Modified: Mon, 07 Sep 2015 11:43:46 GMT
Connection: keep-alive
Expires: Fri, 20 Nov 2015 07:44:36 GMT
Cache-Control: max-age=2592000
Cache-Control: public

responseHeader :

{
    "SERVER"       : "nginx"
    "DATE"         : "Wed, 21 Oct 2015 07:44:36 GMT"
    "LAST-MODIFIED": "Mon, 07 Sep 2015 11:43:46 GMT"
    "CONNECTION"   : "keep-alive"
    "EXPIRES"      : "Fri, 20 Nov 2015 07:44:36 GMT"
    "CACHE-CONTROL": "public"
}

---

Sample code to reproduce : (tested on an empty new project)

WWW www = new WWW("http://www.google.com");

yield return www;

Debug.Log("Google Status : " + www.responseHeaders.ContainsKey("STATUS")); // False
Debug.Log(www.text); // <doctype ...
Debug.Log(www.responseHeaders["STATUS"]); // KeyError

---

Am I missing something or is there someone that can confirm this as a bug ?

Edit: Still not able to retrieve the http status with the latest 5.3

Beast

Just to verify - this is a HTTP(S) request, and not a file:// or other protocol? The header would suggest HTTP, but these things tend to get emulated in some environments, and I did have this behavior before when using a file:// protocol on android. – Bellbird

it's a simple http request to download a file, so I need 304/200 information :) – Beast

Does your www object .error come back without any errors? – Scopas

@MXD no, www.error is null. – Beast

Unity 5.2.2 came out yesterday if you want to give that a try. – Bertilla

updated the project to 5.2.2 but STATUS is still missing :/ – Beast

Answer 1

Your network server is probably responding with a different (unexpected) response to each device. For various reasons such as the user agent string, which could lead the WWW class to not get the STATUS.

Firstly, I would install a proxy so you can see exactly what the phone sends and what the server raw response is. Either Charles Proxy (mac/windows) or Fiddler (windows) are great.

Here is the actual code that Unity WWW class is using to generate status:

        if (num++ == 0 && text.StartsWith("HTTP"))
        {
            dictionary["STATUS"] = text;
        }

Ref: https://github.com/MattRix/UnityDecompiled/blob/master/UnityEngine/UnityEngine/WWW.cs#L483

From the proxy it should be clear what is happening. If not, post the request and response here (as raw).

Noria

this code actually use responseHeaderString as text, and responseHeaderString does not contain HTTP status. So the header construction may not fill this condition, I'll re-check when I can with wireshark but I'm sure that the response is the same for each device and is HTTP compliant. – Beast

Unity messes with the response so responseHeaderString may not be a true indication of what the server is sending. – Noria

with that wireshark capture, was it running as a proxy and your windows phone was set to communicate via it? can you share the servers URL ? – Noria

I'm working on an IMac so I share the wifi to the devices, like a proxy. can't share the servers URL, I try to make this bug with a public url and simple code. – Beast

ok, great. Also try fetching your URL with: redbot.org (it might show up something incorrect) – Noria

I edited my post with a sample code to reproduce the bug using google – Beast

Wow, that's an insane repro. Anything in www.error ? I don't have a windows phone to verify on. – Noria

www.error is null, as stated in my comment on my post. That's why I asked for bug confirmation too, a simple http request with no weird configuration server side. – Beast

I don't see any bugs like that filed. It would be interesting to know if it is on other windows phones too. When I'm not using www I use uniweb: assetstore.unity3d.com/en/#!/content/483 – Noria

Answer 2

Try reading the www.error before looking for the STATUS header.

// Construct the response object
string error = www.error;
if (error == null) {
    if (www.responseHeaders.ContainsKey("STATUS")) {
        string [] status=www.responseHeaders["STATUS"].Split(' ');
        if (status.Length>2 && status[2] != "OK") {
            error = www.responseHeaders["STATUS"];
        }
    }
}

Loyal