How to get custom header from response (retrofit & rxjava) - swift

Question

I am trying to get some custom HTTP headers from all the REST API responses in my code.
Here is how I initiate the client:
private fun initializeClient(): OkHttpClient {
val interceptor = HttpLoggingInterceptor()
interceptor.level = HttpLoggingInterceptor.Level.BODY
val httpClient = OkHttpClient.Builder()
.addInterceptor(object : Interceptor {
override fun intercept(chain: Interceptor.Chain): Response {
val original = chain.request()
val request = original.newBuilder()
.header("Content-Type", "application/json")
.method(original.method, original.body)
.build()
return chain.proceed(request)
}
})
.addInterceptor(interceptor)
.build()
return httpClient
}
private fun initializeApi() {
api = Retrofit.Builder()
.baseUrl(API_BASE_URL)
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJava2CallAdapterFactory.create())
.client(initializeClient())
.build()
.create(RestApi::class.java)
}
Here is a sample of the retrofit implementation:
#POST("/register")
fun registerUser(#Body registerPostData: RegistrationForm): Single<RegistrationResponse>
and the ViewModel part:
disposable.add(
api.registerUser(form)
.subscribeOn(Schedulers.newThread())
.observeOn(AndroidSchedulers.mainThread())
.subscribeWith(object : DisposableSingleObserver<Member>() {
override fun onSuccess(value: RegistrationResponse?) {
// no headers in here
response.value = value
}
override fun onError(e: Throwable?) {
}
})
)
The server returns some x-custom-header in all API responses, which I need to capture in all calls.
Thank you!

Answer 1

Change your retrofit class to return a Response:
#POST("/register")
fun registerUser(#Body registerPostData: RegistrationForm): Single<Response<RegistrationResponse>>
then:
override fun onSuccess(result: Response<RegistrationResponse>?) {
// get header from response.headers()
}