I want to work with multiple base url in retrofit2

[aumobiletools]

I have a structure whose base url address is constantly variable. When my user changes his location in the application, I change the base url to show the closest server to him. but the retrofit client does not regenerate even though I restart the activities and change all the static variables. The only way to do this is to close the application completely and restart it.

I don't have a fixed base url. There could be 4 different locations today, 12 different locations tomorrow. so i need to find a permanent solution.

I have examined a lot in debug mode, but; When the base url changes, it never goes inside the getClient and cannot reassign the base url.

GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(Date.class, new JsonDeserializer<Date>() {
    @Override
    public Date deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
        return new Date(json.getAsJsonPrimitive().getAsLong());
    }
});

Gson gson = builder.create();
OkHttpClient client = new OkHttpClient.Builder().addInterceptor(new Interceptor() {
    @Override
    public Response intercept(Chain chain) throws IOException {
        Request request = chain.request().newBuilder()
                .addHeader("AUTHORIZATION", "" + JWT_TOKEN)
                .build();
        return chain.proceed(request);
    }
}).build();

if (retrofit == null) {
    retrofit = new Retrofit.Builder().baseUrl(baseUrl)
            .addConverterFactory(GsonConverterFactory.create(gson))
            .client(client)
            .build();
    return retrofit;
}

return retrofit;

[craig-day]

I would implement a CallFactory that wraps your client instance. You can then override the url of the request object.

  @Override
  public Call newCall(@Nonnull Request request) {
    HttpUrl updatedUrl = request
        .url()
        .newBuilder()
        .host("my.new.host")
        .build();

    Request updatedRequest = request.newBuilder().url(updatedUrl).build();

    return delegateClient.newCall(updatedRequest);
  }

[gold24park]

I resolved it by create a new interceptor which can change host url.

class HostInterceptor() : Interceptor {

    @Volatile
    private var host = ""

    override fun intercept(chain: Interceptor.Chain): Response {
        host = // your host...
        var request = chain.request()
        host.toHttpUrlOrNull()?.let {
            if (<Your condition>) {
                request = request.newBuilder()
                    .url(request.url.toUrl().toString().replace(request.url.host, it.host))
                    .build()
            }
        }
        return chain.proceed(request)
    }
}