Btukfyl

I'm using

 classpath 'com.android.tools.build:gradle:3.2.1'



 distributionUrl=https://services.gradle.org/distributions/gradle-4.10.2-all.zip

and every time I try to connect to my server API it times out.

HTTP FAILED: java.net.SocketTimeoutException

My server API is perfectly fine and I've tested it with Postman & Direct URL. The only way to fix this is to downgrade to 3.0.4 gradle plugin or connect android device to VPN. I'm from IRAN I doubt that if there is any access issues to my servers from my country. I even tried setting long timeouts for my HTTPClient but I still get the same error on every single API. However after 20-30 retries I can finally receive only 1 successful response.

I'm using Retrofit2.

I also tried setting this in my manifest but nothing changed

android:usesCleartextTraffic="true"

Anyone else struggling with this problem? Anyone have a solution?

I found the problem! It was a problem with self-signed SSL servers. Here's the fix:
you have to create an UnsafeClient class and then set it to retrofit's client.

public class UnsafeOkHttpClient {  

public static OkHttpClient getUnsafeOkHttpClient() {

    try {

        // Create a trust manager that does not validate certificate chains

        final TrustManager trustAllCerts = new TrustManager {

                new X509TrustManager() {

                    @Override

                    public void checkClientTrusted(java.security.cert.X509Certificate chain, String authType) throws CertificateException {

                    }



                    @Override

                    public void checkServerTrusted(java.security.cert.X509Certificate chain, String authType) throws CertificateException {

                    }



                    @Override

                    public java.security.cert.X509Certificate getAcceptedIssuers() {

                        return new java.security.cert.X509Certificate{};

                    }

                }

        };



        // Install the all-trusting trust manager

        final SSLContext sslContext = SSLContext.getInstance("SSL");

        sslContext.init(null, trustAllCerts, new java.security.SecureRandom());



        // Create an ssl socket factory with our all-trusting manager

        final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();



        OkHttpClient.Builder builder = new OkHttpClient.Builder();

        builder.sslSocketFactory(sslSocketFactory, (X509TrustManager)trustAllCerts[0]);

        builder.hostnameVerifier(new HostnameVerifier() {

            @Override

            public boolean verify(String hostname, SSLSession session) {

                return true;

            }

        });



        OkHttpClient okHttpClient = builder.build();

        return okHttpClient;

    } catch (Exception e) {

        throw new RuntimeException(e);

    }

  }

}



OkHttpClient okHttpClient = UnsafeOkHttpClient.getUnsafeOkHttpClient();



Retrofit.Builder builder = new Retrofit.Builder()  

    .baseUrl("BASEURL")

    .client(okHttpClient);