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How to use OKHTTP interceptors in Kotlin Android

How to use OKHTTP interceptors in Kotlin Android.

Here's a step-by-step tutorial on how to use OKHTTP interceptors in Kotlin Android.

Step 1: Add the OKHTTP dependency​

To use OKHTTP interceptors, you need to add the OKHTTP library to your project. Open your app's build.gradle file and add the following dependency:

implementation 'com.squareup.okhttp3:okhttp:4.9.0'

Sync your project to download the dependency.

Step 2: Create an OKHTTP client​

To use interceptors, you need to create an instance of the OKHTTP client. In your Kotlin file, import the necessary OKHTTP classes:

import okhttp3.Interceptor
import okhttp3.OkHttpClient
import okhttp3.Response

Then, create an OKHTTP client with the default settings:

val client = OkHttpClient()

Step 3: Create an interceptor​

Interceptors allow you to add custom logic to the request and response flow of OKHTTP. To create an interceptor, implement the Interceptor interface and override the intercept method:

class LoggingInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request()

        // Perform any pre-request logic here

        val response = chain.proceed(request)

        // Perform any post-response logic here

        return response
    }
}

In the intercept method, you can perform any necessary logic before making the request (pre-request logic) and after receiving the response (post-response logic).

Step 4: Add the interceptor to the client​

Once you have created the interceptor, you can add it to the OKHTTP client using the addInterceptor method:

val loggingInterceptor = LoggingInterceptor()
client.addInterceptor(loggingInterceptor)

You can add multiple interceptors to the client by calling addInterceptor multiple times.

Step 5: Make a request​

Now that you have set up the OKHTTP client with the interceptor, you can make a request. Create a new request using the Request.Builder class and pass it to the client's newCall method:

val request = Request.Builder()
    .url("https://api.example.com/endpoint")
    .build()

val call = client.newCall(request)

Step 6: Execute the request​

To execute the request, call the execute method on the Call object:

val response = call.execute()

Step 7: Access the response​

You can access the response body, headers, and other information using the Response object:

val responseBody = response.body?.string()
val headers = response.headers
// Perform any necessary operations with the response

Step 8: Handle exceptions​

Remember to handle any exceptions that may occur during the request:

try {
    val response = call.execute()
    // Handle the response
} catch (e: IOException) {
    e.printStackTrace()
    // Handle the exception
}

That's it! You have successfully used OKHTTP interceptors in Kotlin Android. Interceptors allow you to customize the request and response flow of OKHTTP, enabling you to add logging, authentication, caching, and other functionalities to your network requests.