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This OkHttp application interceptor will replace the destination hostname in the request URL.
import java.io.IOException;
import okhttp3.HttpUrl;
import okhttp3.Interceptor;
import okhttp3.OkHttpClient;
import okhttp3.Request;
/** An interceptor that allows runtime changes to the URL hostname. */
public final class HostSelectionInterceptor implements Interceptor {
private volatile String host;
public void setHost(String host) {
this.host = host;
}
@Override public okhttp3.Response intercept(Chain chain) throws IOException {
Request request = chain.request();
String host = this.host;
if (host != null) {
HttpUrl newUrl = request.url().newBuilder()
.host(host)
.build();
request = request.newBuilder()
.url(newUrl)
.build();
}
return chain.proceed(request);
}
public static void main(String[] args) throws Exception {
HostSelectionInterceptor interceptor = new HostSelectionInterceptor();
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.addInterceptor(interceptor)
.build();
Request request = new Request.Builder()
.url("http://www.coca-cola.com/robots.txt")
.build();
okhttp3.Call call1 = okHttpClient.newCall(request);
okhttp3.Response response1 = call1.execute();
System.out.println("RESPONSE FROM: " + response1.request().url());
System.out.println(response1.body().string());
interceptor.setHost("www.pepsi.com");
okhttp3.Call call2 = okHttpClient.newCall(request);
okhttp3.Response response2 = call2.execute();
System.out.println("RESPONSE FROM: " + response2.request().url());
System.out.println(response2.body().string());
}
}
@iBotasky
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iBotasky commented Apr 6, 2018

@JessYanCoding
I request two api with different baseUrl at the same time, one of the request's baseUrl is wrong.

mHost.setHost(Urls.DOUBAN_FILM_URL_HOST)
        mRetrofit.create(FilmsApi::class.java)
                .getInTheaters()
                .flatMap { filmsData -> Observable.fromIterable(filmsData.films) }
                .compose(TransformScheduler.applyNewThreadScheduler())
                .subscribe(
                        { film ->
                            val filmEntity = FilmEntity(text = film.title, comment = film.originalTitle, date = Date())

                            Log.e("TAG", "put success " + filmEntity.text)
                        },
                        { e ->
                            Log.e("TAG", e.message)
                        })

        mHost.setHost(Urls.GANK_GIRLS_URL_HOST)
        mRetrofit.create(GirlsApi::class.java)
                .accessGirls(1)
                .compose(TransformScheduler.applyNewThreadScheduler())
                .subscribe({ girl ->
                    Log.e("TAG", "size " + girl.results.size)
                })

The two baseurl are: http://gank.io/ and https://api.douban.com/
And occur this:
D/OkHttp: <-- 404 Not Found http://gank.io/v2/movie/in_theaters (308ms)
This is wrong because the base url is https://api.douban.com/ but not http://gank.io/
I think it course by concurrency with the Volatile , how solve it?

@JessYanCoding
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@iBotasky Because the network request is asynchronous, try https://github.com/JessYanCoding/RetrofitUrlManager

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