Kako promeniti sve zahteve u Retrofit biblioteci?

Interceptor. Dodaje se na OkHttpClient koji koristi Retrofit. Interceptor može da menja zahtev pre slanja i odgovor pre obrade.

interface Interceptor {
    fun intercept(chain: Interceptor.Chain): Response
}

Napravite sopstvenu implementaciju Interceptor i dodajte je u OkHttpClient.Builder:

class MyChangingInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val originalRequest = chain.request()
        val newRequest = originalRequest.newBuilder()
            // Primer: dodavanje zaglavlja
            .addHeader("X-Custom-Header", "SomeValue")
            // Primer: promena URL
            // .url("https://new.api.com" + originalRequest.url.encodedPath)
            // Primer: promena metode (ako je potrebno)
            // .method("POST", originalRequest.body)
            .build()
        return chain.proceed(newRequest)
    }
}

Dodajte interceptor u OkHttpClient:

val client = OkHttpClient.Builder()
    .addInterceptor(MyChangingInterceptor())
    // Možete dodati više interceptora
    // .addInterceptor(AnotherInterceptor())
    .build()

Koristite kreirani OkHttpClient pri pravljenju instance Retrofit:

val retrofit = Retrofit.Builder()
    .baseUrl("https://your.api.com/")
    .client(client)
    .addConverterFactory(GsonConverterFactory.create())
    .build()