Develop Reference

Handshake failed on some android devices

On some device i have no problems with a communication with the server used with the retrofit framework. I also used several Android versions to verify that the code run. But on some devices (Samsung S8) I got each time an error: 'Handshake failed'. Does anybody have an idea where is the problem? Thanks!
Here is my code:
protected static Retrofit getInstanceWithoutToken() {
final OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(new Interceptor() {
#Override
public okhttp3.Response intercept(Chain chain) throws IOException {
final Request original = chain.request();
final Request request = original.newBuilder()
.method(original.method(), original.body())
.build();
return chain.proceed(request);
}
});
return new Retrofit.Builder()
.baseUrl(CommonConstantsRest.REST_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(httpClient.build())
.build();
}

The problem was the ssl communication. Adding the following CipherSuite solved the problem
protected static Retrofit getInstanceWithoutToken() {
ConnectionSpec spec = new
ConnectionSpec.Builder(ConnectionSpec.MODERN_TLS)
.tlsVersions(TlsVersion.TLS_1_2)
.cipherSuites(
CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
CipherSuite.TLS_DHE_RSA_WITH_AES_128_GCM_SHA256)
.build();
final OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
HttpLoggingInterceptor logging = new HttpLoggingInterceptor();
logging.setLevel(HttpLoggingInterceptor.Level.BASIC);
httpClient.connectionSpecs(Collections.singletonList(spec));
httpClient
.addInterceptor(logging)
.addInterceptor(new Interceptor() {
#Override
public okhttp3.Response intercept(Chain chain) throws IOException {
final Request original = chain.request();
final Request request = original.newBuilder()
.method(original.method(), original.body())
.build();
return chain.proceed(request);
}
});
return new Retrofit.Builder()
.baseUrl(CommonConstantsRest.REST_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(httpClient.build())
.build();
}

Posting data on django api from retrofit 2 android

I am working on a project which will retrieve and send data to server through django api. I am facing problem to POST data through the api. My codes are given below. Executing this code give 401 Error in response in android studio but the api works fine in postman or web browser. TIA for the help.
Class to set retrofit instance:
public class ApiClient {
public static final String BASE_URL = "https://myapilink.com/";
private static Retrofit retrofit = null;
public static Retrofit getClient() {
final OkHttpClient.Builder httpClient = new OkHttpClient.Builder();
httpClient.addInterceptor(new Interceptor() {
#Override
public Response intercept(Chain chain) throws IOException {
Request original = chain.request();
// Request customization: add request headers
Request.Builder requestBuilder = original.newBuilder()
.header("Authorization", "auth-value"); // <-- this is the important line
Request request = requestBuilder.build();
return chain.proceed(request);
}
});
final OkHttpClient okHttpClient = new OkHttpClient.Builder()
.connectTimeout(60, TimeUnit.SECONDS)
.writeTimeout(30, TimeUnit.SECONDS)
.readTimeout(30, TimeUnit.SECONDS)
.addInterceptor(new Interceptor() {
#Override
public Response intercept(Chain chain) throws IOException {
Request original = chain.request();
// Request customization: add request headers
Request.Builder requestBuilder = original.newBuilder()
.header("Authorization", "Basic YWRtaW46MTIzNA=="); // <-- this is the important line
Request request = requestBuilder.build();
return chain.proceed(request);
}
})
.build();
if (retrofit==null) {
retrofit = new Retrofit.Builder()
.baseUrl(BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.createWithScheduler(Schedulers.io()))
.client(okHttpClient)
.build();
}
return retrofit;
}
Retrofit interface:
public interface ApiInterface {
#Headers("Content-Type: application/json")
#POST("/api/auth/login/")
Call<LoginModel> getLoginResponseWithRetrofit(#Body LoginBody loginBody);
}
LoginBody model:
public class LoginBody {
String email;
String password;
public LoginBody(String email, String password){
this.email=email;
this.password=password;
}
}
Main api calling method:
public void postDataWithRetrofit(String email, String password){
//modelFromIDProvider.add(InternalDataProvider.getInstance().getAgentDataModelList());
int selectedPosition,id;
LoginBody loginBody = new LoginBody(email, password);
ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
Call<LoginModel> call;
Map<String, String> formData = new HashMap<>();
formData.put("email", email);
formData.put("password", password);
Log.d(TAG,"formdata "+formData.toString());
//call = apiService.getLoginResponseWithRetrofit(email, password);
call = apiService.getLoginResponseWithRetrofit(loginBody);
call.enqueue(new Callback<LoginModel>() {
#Override
public void onResponse(Call<LoginModel> call, Response<LoginModel> response) {
Log.d(TAG,"isSuccessful "+response.isSuccessful()+" code "+response.code());
Log.d(TAG,"Data from response : "+response.body());
if(!response.isSuccessful()) {
dialog.dismiss();
return;
}
LoginModel responseModel = response.body();
InternalDataProvider.getInstance().setLoginDataModel(responseModel);
Log.d(TAG,"Data from response : "+response.body());
}
#Override
public void onFailure(Call<LoginModel> call, Throwable t) {
if(call.isCanceled()){
Log.d(TAG," call cancelled "+t.toString());
return;
}
Log.d(TAG," inside onFailure "+t.toString());
}
});
}

How to add multiple headers with ok Http

I am using Retrofit 2 and Okhttp for my android project. I want to add multiple headers in the api request.
This is my interceptor code :
public class NetworkInterceptors implements Interceptor {
#Override
public Response intercept(Interceptor.Chain chain) throws IOException {
Request request = chain.request().newBuilder()
.addHeader("Userid", "10034")
.addHeader("Securitykey", "Fb47Gi")
.build();
return chain.proceed(request);
}
}
This is not working properly. In server side I am getting only the last added header (in the above example I am getting only Securitykey missing "Userid" )
Please Help.

Thanks for support
I found the answer, This is working fine for me
public class NetworkInterceptors implements Interceptor {
#Override
public Response intercept(Interceptor.Chain chain) throws IOException {
Request request = chain.request();
Request newRequest;
newRequest = request.newBuilder()
.addHeader("Userid", "10034")
.addHeader("Securitykey", "Fb47Gi")
.build();
return chain.proceed(newRequest);
}
}

You can use this class pass the context in this class if user already logged in.
public class ApiClient {
public static final String BASE_URL = "";
private static Retrofit retrofit = null;
static Context mcontext;
public static Retrofit getClient(Context context,String baseUrl)
{
mcontext = context;
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.connectTimeout(220, TimeUnit.SECONDS)// Set connection timeout
.readTimeout(220, TimeUnit.SECONDS)// Read timeout
.writeTimeout(220, TimeUnit.SECONDS)// Write timeout
.addInterceptor( HeaderInterceptor() )
// .addNetworkInterceptor(REWRITE_CACHE_CONTROL_INTERCEPTOR)// Add cache interceptor
// .cache(cache)// Add cache
.build();
Gson gson = new GsonBuilder()
.setLenient()
.create();
if (retrofit == null) {
retrofit = new Retrofit.Builder()
.baseUrl(baseUrl)
.client(okHttpClient)
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.addConverterFactory(GsonConverterFactory.create(gson))
.build();
}
return retrofit;
}
private static Interceptor HeaderInterceptor() {
return new Interceptor() {
#Override
public okhttp3.Response intercept(Chain chain) throws IOException {
okhttp3.Request request = chain.request();
if(SharedPreference.getlogin(mcontext).equals("")){
request = request.newBuilder()
.addHeader("Accept", "application/json")
.addHeader("Authorization", "Bearer "+SharedPreference.gettoken(mcontext))
.build();
}
else {
request = request.newBuilder()
.addHeader("Accept", "application/json")
.build();
}
okhttp3.Response response = chain.proceed(request);
return response;
}
};
}
}

Retrofit 2 addQueryParam replacement

In previous retrofit versions it was possible to add an interceptor and use that to add query parameters that were globally needed for example:
.setRequestInterceptor(new RequestInterceptor() {
#Override
public void intercept(RequestFacade requestFacade) {
requestFacade.addQueryParam("platform", "android");
requestFacade.addQueryParam("app_version", com.package.BuildConfig.VERSION_NAME);
}
})
With the new implementation, it's required that you use OkHttpClient.interceptors. With this new approach, how would one append parameters without removing the original paramaters?

Here is an okhttp implementation --
OkHttpClient client = new OkHttpClient();
client.interceptors().add(new Interceptor() {
#Override
public com.squareup.okhttp.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
HttpUrl url = request.httpUrl().newBuilder()
.addQueryParameter("platform", "android")
.addQueryParameter("app_version", com.package.BuildConfig.VERSION_NAME)
.build();
Request newRequest = chain.request().newBuilder().url(url).build();
return chain.proceed(newRequest);
}
});
Add the client to your retrofit --
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://www.example.com")
.client(client)
.build();

With retrofix 2.3.0 the following code can be used:
final OkHttpClient client = new OkHttpClient.Builder().addInterceptor(new Interceptor() {
#Override
public Response intercept(final Chain chain) throws IOException
{
final Request request = chain.request();
final HttpUrl url = chain.request().url().newBuilder()
.addQueryParameter("platform", "android")
.addQueryParameter("app_version", com.package.BuildConfig.VERSION_NAME)
.build();
final Request newRequest = chain.request().newBuilder().url(url).build();
return chain.proceed(newRequest);
}
}
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://www.example.com")
.client(client)
.build();

Retrofit - Intercept responses globally

I'd like to intercept all responses received by the retrofit engine, and scan for HTTP error code, for example error 403.
I'm aware I can use the failure(RetrofitError error) callback of every request and check for 403's but I'd like to wrap the response globally.
I can see that request interception is possible, but I do not see a similar option for response.
Any suggestions?

I was able to accomplish that by adding an interceptor to the OkHttpClient that retrofit is using.
Kotlin + Retrofit 2.x
val clientBuilder = OkHttpClient.Builder()
clientBuilder.addInterceptor { chain ->
val request = chain.request()
val response = chain.proceed(request)
if (response.code() == 403) {
handleForbiddenResponse()
}
response
}
Retrofit 2.x:
OkHttpClient.Builder clientBuilder = new OkHttpClient.Builder();
clientBuilder.
addInterceptor(new Interceptor() {
#Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Response response = chain.proceed(request);
if (response.code() == 403) {
handleForbiddenResponse();
}
return response;
}
});
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(API_BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(clientBuilder.build();)
.build();
Retrofit 1.x:
public class ForbiddenInterceptor implements Interceptor {
#Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
Response response = chain.proceed(request);
if (response.code() == 403) {
handleForbiddenResponse();
}
return response;
}
}
OkHttpClient okHttpClient = Utils.createUnsafeOkHttpClient();
okHttpClient.interceptors().add(new ForbiddenInterceptor());
RestAdapter.Builder restAdapterBuilder = new RestAdapter.Builder()
.setEndpoint(API_BASE_URL)
.setClient(new OkClient(okHttpClient));

Another possibility is to override the execute method in Retrofit's OkClient. In my case I was looking for a specific response header, so it went something like this:
OkClient client = new OkClient(okHttpClient) {
#Override
public retrofit.client.Response execute(retrofit.client.Request request) throws IOException {
retrofit.client.Response response = super.execute(request);
// Do whatever with 'response', such as looking for the value of a particular header:
List<retrofit.client.Header> headers = response.getHeaders();
for (retrofit.client.Header header : headers) {
if (MY_HEADER.equalsIgnoreCase(header.getName())) {
this.savedValue = header.getValue();
break;
}
}
return response;
}
};
RestAdapter.Builder restAdapterBuilder = new RestAdapter.Builder()
.setEndpoint(API_BASE_URL)
.setClient(client);

OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor(new Interceptor() {
#Override
public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
okhttp3.Response response = chain.proceed(request);
// todo deal with the issues the way you need to
if (response.code() == 500) {
startActivity(
new Intent(
ErrorHandlingActivity.this,
ServerIsBrokenActivity.class
)
);
return response;
}
return response;
}
})
.build();
Retrofit.Builder builder = new Retrofit.Builder()
.baseUrl("http://your_url")
.client(okHttpClient)
.addConverterFactory(GsonConverterFactory.create());
Retrofit retrofit = builder.build();
As you can see in the snippet above, the okhttp3.Response response = chain.proceed(request); line accesses the server response. Consequently, we can check the status code with if (response.code() == 500) and then open the ServerIsBrokenActivity.