Add arguments to the end of a url in Retrofit

Question

So, I'm trying to make a REST request that looks like this: https://api.digitalocean.com/droplets/?client_id=[client_id]&api_key=[api_key]

Where https://api.digitalocean.com is the endpoint, and @GET("/droplets/") would be the annotation. I would like the end bit to be added automatically, since it would be identical for any API requests I make, and it would be a hassle to add it to each request. Is there any way to do that?

Answer 1

Here's my interceptor for Retrofit 2:

    private static class AuthInterceptor implements Interceptor {

    private String mApiKey;

    public AuthInterceptor(String apiKey) {
        mApiKey = apiKey;
    }

    @Override
    public Response intercept(Chain chain) throws IOException {
        HttpUrl url = chain.request().httpUrl()
                .newBuilder()
                .addQueryParameter("api_key", mApiKey)
                .build();
        Request request = chain.request().newBuilder().url(url).build();
        return chain.proceed(request);
    }
}

Answer 2

Pass a RequestInterceptor instance to the RestAdapter.Builder which adds the query parameters.

Retrofit will invoke the request interceptor for every API call which allows you to append query parameters or replace path elements.

In this callback you will be able to append the clientId and apiKey query parameters for every request.