react native android: TypeError: Network request failed

Question

I'm using fetch command, running on Android emulator. When I used it with port "127.0.0.1" I got this error all the time no matter what type of request I was doing.

Then I changed it to http://10.0.2.2 , and GET requests generally work, but I'm trying to make a POST request and get this error:

TypeError: Network request failed

My code:

const url = 'http://10.0.2.2:143'


            const payload = {
                method,
                headers: {
                    Accept: 'application/json',
                    'Content-Type': 'application/json',
                    ['x-access-token']: `Bearer ${token}`,
                },
                body,
            }

            const response = await fetch(url, payload)

On iOS everything's working fine so I don't think it's a problem with this code. What can I try to make it work on Android

The request doesn't even reach the server

Answer 1

if you are using SDK 9, try with https, if it still doesn't work, then you need to add something in Android/app/src/java/MainApplication:

@Override
public void onCreate() {
  super.onCreate();
  SoLoader.init(this, /* native exopackage */ false);
  //  add below code
  OkHttpClientProvider.setOkHttpClientFactory(new CustomClientFactory());
}

then write another class:

import com.facebook.react.modules.network.OkHttpClientFactory;
import com.facebook.react.modules.network.OkHttpClientFactory;
import com.facebook.react.modules.network.OkHttpClientProvider;
import com.facebook.react.modules.network.ReactCookieJarContainer;

import java.security.cert.CertificateException;
import java.util.ArrayList;

import java.util.List;

import java.util.concurrent.TimeUnit;


import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import okhttp3.CipherSuite;
import okhttp3.ConnectionSpec;
import okhttp3.OkHttpClient;
import okhttp3.TlsVersion;

import static android.content.ContentValues.TAG;

class CustomClientFactory implements OkHttpClientFactory {
  private static final String TAG = "OkHttpClientFactory";
  @Override
  public OkHttpClient createNewNetworkModuleClient() {
    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()
                .connectTimeout(0, TimeUnit.MILLISECONDS).readTimeout(0, TimeUnit.MILLISECONDS)
                .writeTimeout(0, TimeUnit.MILLISECONDS).cookieJar(new ReactCookieJarContainer());
        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) {
        Log.e(TAG, e.getMessage());
        throw new RuntimeException(e);
    }
}

}

Answer 2

if you are using android 9 or higher you should make requests with https, http has security problems