What is this Okhttp Interceptor?

What is this Okhttp Interceptor?

Basically, Interceptors are like security guards at the airport. They decide our passage and stop.

It has two different tasks. These;

• It’s used to log for a network call using the interceptor.
• It’s used to cache network calls.

There are two different interceptors.

• Application Interceptors are added between these interceptors Application code and OkHttp Core Library. We use it with addInterceptor().
• Network Interceptor, these interceptors are added between OkHttp Core Library and Server. We can add them to OkHttpClient using addNetworkInterceptor().

How to add Interceptor in OkHttp?

These add to Interceptor in OkHttp.

    fun myHttpClient(): OkHttpClient {
        val builder = OkHttpClient().newBuilder()
            .addInterceptor(/*our interceptor*/)
        return builder.build()
    }

If we create to own interceptor, like code this bellow done.

class ErrorInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {

        val request: Request = chain.request()
        val response = chain.proceed(request)
        when (response.code()) {
            400 -> {
                //Show Bad Request Error Message
            }
            401 -> {
                //Show UnauthorizedError Message
            }

            403 -> {
                //Show Forbidden Message
            }

            404 -> {
                //Show NotFound Message
            }

            // ... and so on

        }
        return response
    }
}

As understood in the code, we make the necessary logging according to the returned response.

This article hopefully help to your. See you in the next articles.