android – Retrofit 2 not sending data when ProGuard is enabled-ThrowExceptions

Exception or error:

I try to login my users using Retrofit 2. (Basically a GET to the login URL with a basic header) It works well but once I ProGuard it, the Header Authorization is not sent anymore. (See log outputs)

Sample code :

User Model :

public interface UserService {

    @GET(GET_LOGIN)
    Observable<User> login(@Header("Authorization") String basic);
}

Login Activity :

public void onClick(View v) {
    mRetrofit.create(UserService.class)
             .login(Credentials.basic(email, password))
             .subscribeOn(Schedulers.io())
             .observeOn(AndroidSchedulers.mainThread())
             .subscribe(user -> {
                UserHelper.save(LoginActivity.this, user);
             }, throwable -> Dog.d);
}

Proguard File :

# Retrofit
-dontwarn retrofit2.** 
-dontwarn org.codehaus.mojo.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepattributes *Annotation*
-keepclasseswithmembers class * {
    @retrofit.* <methods>;
}

-keepclasseswithmembers interface * {
    @retrofit.* <methods>;
}

Logs (proguard) :

D/OkHttp: --> GET http://passport-supercairos.rhcloud.com/users/login HTTP/1.1
D/OkHttp: User-Agent: VirtualPassport-Client {Android-23} {Aquaris_E5}
D/OkHttp: Cache-Control: max-stale=10800
D/OkHttp: --> END GET
D/OkHttp: <-- HTTP/1.1 401 Unauthorized (258ms)
D/OkHttp: Date: Fri, 19 Feb 2016 12:57:19 GMT
D/OkHttp: X-Powered-By: Express
D/OkHttp: WWW-Authenticate: Basic realm="Users"
D/OkHttp: Keep-Alive: timeout=15, max=100
D/OkHttp: Connection: Keep-Alive
D/OkHttp: Transfer-Encoding: chunked
D/OkHttp: Content-Type: text/plain
D/OkHttp: OkHttp-Sent-Millis: 1455886639681
D/OkHttp: OkHttp-Received-Millis: 1455886639787
D/OkHttp: Unauthorized
D/OkHttp: <-- END HTTP (12-byte body)

Logs (non-proguard) :

D/OkHttp: --> GET http://passport-supercairos.rhcloud.com/users/login HTTP/1.1
D/OkHttp: User-Agent: VirtualPassport-Client {Android-23} {Aquaris_E5}
D/OkHttp: Cache-Control: max-stale=10800
D/OkHttp: Authorization: Basic ZG9yb2ZyanVAZ21haWwuY29tOmN2dnZ2dnY=
D/OkHttp: --> END GET
D/OkHttp: <-- HTTP/1.1 401 Unauthorized (258ms)
D/OkHttp: Date: Fri, 19 Feb 2016 12:57:19 GMT
D/OkHttp: X-Powered-By: Express
D/OkHttp: WWW-Authenticate: Basic realm="Users"
D/OkHttp: Keep-Alive: timeout=15, max=100
D/OkHttp: Connection: Keep-Alive
D/OkHttp: Transfer-Encoding: chunked
D/OkHttp: Content-Type: text/plain
D/OkHttp: OkHttp-Sent-Millis: 1455886639681
D/OkHttp: OkHttp-Received-Millis: 1455886639787
D/OkHttp: Unauthorized
D/OkHttp: <-- END HTTP (12-byte body)

Full code can be found here : https://github.com/supercairos/virtual-passport

How to solve:

I finally managed to make it work. Here is the proguard configuration regarding Retrofit 2

# Retrofit
-dontwarn retrofit2.**
-dontwarn org.codehaus.mojo.**
-keep class retrofit2.** { *; }
-keepattributes Signature
-keepattributes Exceptions
-keepattributes *Annotation*

-keepattributes RuntimeVisibleAnnotations
-keepattributes RuntimeInvisibleAnnotations
-keepattributes RuntimeVisibleParameterAnnotations
-keepattributes RuntimeInvisibleParameterAnnotations

-keepattributes EnclosingMethod

-keepclasseswithmembers class * {
    @retrofit2.* <methods>;
}

-keepclasseswithmembers interface * {
    @retrofit2.* <methods>;
}

Thanks @xudshen

UPDATE

The main problem: I used proguard-android-optimize So I should added:

-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}

I also switched back to the regular Retrofit 2 proguard config provided by square :

# Platform calls Class.forName on types which do not exist on Android to determine platform.
-dontnote retrofit2.Platform
# Platform used when running on RoboVM on iOS. Will not be used at runtime.
-dontnote retrofit2.Platform$IOS$MainThreadExecutor
# Platform used when running on Java 8 VMs. Will not be used at runtime.
-dontwarn retrofit2.Platform$Java8
# Retain generic type information for use by reflection by converters and adapters.
-keepattributes Signature
# Retain declared checked exceptions for use by a Proxy instance.
-keepattributes Exceptions

###

Adding to @Romain’s answer
You Need to add to proguard file

-keepclasseswithmembers class * {
    @retrofit2.http.* <methods>;
}

If you are using @Header, @Query…

Reference from here Retrofit2 proguard remove param

###

Another simple solution
use @keep from support annotation
https://developer.android.com/reference/android/support/annotation/Keep.html

@Keep
interface APIService 
{

    @GET("/user/auth")
    fun auth(@Header(Constants.AUTHORIZATION) authorization: String): Call<User>

}

###

for me works using annotation @SerializedName

public class YourJsonClass{
   @SerializedName("name") String username;

   ...
 }

###

finally i find.
just try this if you use Gson ,
add this to retrofit pro-guard :

-keepclassmembers,allowobfuscation class * {
  @com.google.gson.annotations.SerializedName <fields>;
} 

then use @SerializedName("name") in your model .kotlin example:

class PaymentRequestModel (
    @SerializedName("name")
    @Expose
    var name : String = "",
}

###

Add Retrofit 2 compatibility with Proguard code Obfuscator

    -dontwarn retrofit.**
    -keep class retrofit.** { *; }
    -keepattributes Signature
    -keepattributes Exceptions
    -dontwarn java.lang.invoke.*
    -keep class com.elephantmobile.ui.remote.model.** { *; }
    -dontwarn retrofit.appengine.UrlFetchClient
    -keepclasseswithmembers class * {
        @retrofit.http.* <methods>;
    }
    -keepclassmembernames interface * {
        @retrofit.http.* <methods>;
    }
    -dontwarn retrofit2.Platform$Java8

###

You need to add

 @SerializedName("yourInputParameter")

in your bean(model) class for your request body

For example

 public class YourClass{
       @SerializedName("yourInputParameter") String yourInputParameter;

       ...
     }

it will work

because now retrofit unable to read your request body because proguard(minifyEnabled) is true

after adding @SerializedName in your request body it will definitely work for you

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