Make web requests with a proxy

We currently have customers who are using a proxy in their company and thus can't use our Unity app, since we need to make HTTP requests.

Since most posts I see about this subject are rather old, I was wondering if there is now a way to use a proxy with the WWW class or anything in the Unity API? No, my app doesn't run in the webplayer

If still not possible, I started to use HttpWebRequest but I get a TlsException “The authentication or decryption has failed”. I tried what's explained in this answer but it didn't solve my problem: https://stackoverflow.com/questions...h-the-authentication-or-decryption-has-failed

Any idea ? Either for using Unity classes or C# classes?

 

Thanks for your answer!

However, I'm sorry, I'm definitely not expert with proxies and HTTP requests. What headers am I supposed to use for that?
I thought I was supposed to use the header Host to set the proxy address, but I get that exception:
InvalidOperationException: Cannot override system-specified headers.

Just realized I forgot to mention we're on Unity 2017.4.10

 

Omg, UnityWebRequest indeed uses system proxy settings, the issue is not on our side...
For our client's needs, the headers you gave should do the trick.

Thanks a lot

 

request.SetRequestHeader("Proxy-Authenticate", "88.***:8888");
Like this?
It gives: InvalidOperationException: Cannot override system-specified headers

 

I did not want to change the environment variables, because a proxy is needed for only one request
Header "Proxy-Authenticate" doesn't work.
I was able to work around the problem with Mono.

ServicePointManager.ServerCertificateValidationCallback = MyRemoteCertificateValidationCallback;

HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create(API_URL);

string proxyHost = "162.22.22.22";

int proxyPort = 3222;

httpRequest.Proxy = new WebProxy(proxyHost, proxyPort);

httpRequest.ContentType = "application/json";

httpRequest.Method = "POST";



using (var streamWriter = new StreamWriter(httpRequest.GetRequestStream()))

{

    string json = "jsontext";



    streamWriter.Write(json);

}



var httpResponse = (HttpWebResponse)httpRequest.GetResponse();

using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))

{

    var result = streamReader.ReadToEnd();

}

I use this code in the editor and rarely, so I did not make a separate thread

public static bool MyRemoteCertificateValidationCallback(System.Object sender,

    X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)

{

    bool isOk = true;

    // If there are errors in the certificate chain,

    // look at each error to determine the cause.

    if (sslPolicyErrors != SslPolicyErrors.None) {

        for (int i=0; i<chain.ChainStatus.Length; i++) {

            if (chain.ChainStatus[i].Status == X509ChainStatusFlags.RevocationStatusUnknown) {

                continue;

            }

            chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;

            chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;

            chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan (0, 1, 0);

            chain.ChainPolicy.VerificationFlags = X509VerificationFlags.AllFlags;

            bool chainIsValid = chain.Build ((X509Certificate2)certificate);

            if (!chainIsValid) {

                isOk = false;

                break;

            }

        }

    }

    return isOk;

}