How to setup Retrofit with no baseUrl

Question

My apiPath is fully dynamic. I am having items containing fields such us "ipAddress" and "SSLprotocol". Based on them I can build my url:

private String urlBuilder(Server server) {
    String protocol;
    String address = "";

    if (AppTools.isDeviceOnWifi(activity)) {
        address = serverToConnect.getExternalIp();
    } else if (AppTools.isDeviceOnGSM(activity)) {
        address = serverToConnect.getInternalIp();
    }

    if (server.isShouldUseSSL()) {
        protocol = "https://";
    } else {
        protocol = "http://";
    }
    return protocol + address;
}

So my protocol + address can be: http:// + 192.168.0.01:8010 = http://192.168.0.01:8010

And I would like to use it like that:

@FormUrlEncoded
@POST("{fullyGeneratedPath}/json/token.php")
Observable<AuthenticationResponse> authenticateUser(
            @Path("fullyGeneratedPath") String fullyGeneratedPath,
            @Field("login") String login,
            @Field("psw") String password,
            @Field("mobile") String mobile);

So full path for authenticateUser would be http://192.168.0.01:8010/json/token.php - for example.

That means I don't need any basePath because I create whole basePath myself depending on server I want to connect to.

My retrofit setup is:

@Provides
@Singleton
Retrofit provideRetrofit(OkHttpClient okHttpClient,
            Converter.Factory converterFactory,
            AppConfig appConfig) {
    Retrofit.Builder builder = new Retrofit.Builder();
    builder.client(okHttpClient)
            .baseUrl(appConfig.getApiBasePath())
            .addConverterFactory(converterFactory)
            .addCallAdapterFactory(RxJavaCallAdapterFactory.create());

    return builder.build();
}

If I remove baseUrl then I get error that this parameter is required. So I set my apiBasePath to:

public String getApiBasePath() {
    return "";
}

And then I get error instantly after I create retrofit instance:

java.lang.IllegalArgumentException: Illegal URL: 

How to solve it?

Solution 1

From source (New URL resolving concept) you can simply specify whole path in post request.

Moreover we also can declare a full URL in @Post in Retrofit 2.0:

public interface APIService {

    @POST("http://api.nuuneoi.com/special/user/list")
    Call<Users> loadSpecialUsers();

}

Base URL will be ignored for this case.

Solution 2

just use like this

public interface UserService {  
    @GET
    public Call<ResponseBody> profilePicture(@Url String url);
}

source

Solution 3

With Retrofit 2 you have to put base url anyway. If it is not known then you just can put any url, usually, it is good to use http://localhost/.