How to Handle Errors Using Interceptor In Kotlin?

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Interceptors in Kotlin are powerful tools for handling errors in a more modular and efficient way. By creating an interceptor, you can intercept network requests and responses, providing a centralized point for error handling. To handle errors using interceptor in Kotlin, you can define custom error classes, such as RemoteException, and use them to wrap exceptions thrown during network calls. This allows you to easily distinguish between different types of errors and handle them accordingly. Additionally, you can use the onError method in the interceptor to catch and handle any errors that occur during the network request. This can include logging the error, retrying the request, or displaying an error message to the user. Overall, using interceptors in Kotlin for error handling can make your code cleaner, more maintainable, and easier to debug.

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What is an interceptor in Kotlin?

An interceptor in Kotlin is a type of function that can be used to modify or intercept data flow in a pipeline or chain of operations. It is commonly used in networking libraries to intercept and modify incoming or outgoing requests before they are processed by the underlying system. Interceptors can be used to add headers, log data, modify requests, authenticate requests, or perform other types of manipulation on data flowing through the system.


How to customize an interceptor in Kotlin?

To customize an interceptor in Kotlin, you can create a new class that implements the Interceptor interface provided by OkHttp. Here's an example:

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import okhttp3.Interceptor
import okhttp3.Response

class CustomInterceptor : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val request = chain.request().newBuilder()
            .header("Custom-Header", "CustomValue")
            .build()

        return chain.proceed(request)
    }
}


In this example, the CustomInterceptor class adds a custom header to every request that passes through it. You can customize the interceptor further by adding additional logic or headers as needed.


To use the custom interceptor in your OkHttp client, you can add it to the OkHttpClient builder like this:

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val client = OkHttpClient.Builder()
    .addInterceptor(CustomInterceptor())
    .build()


This will add the CustomInterceptor to the interceptor chain of the OkHttpClient, allowing it to modify requests and responses as needed.


What is the difference between interceptors and filters in Kotlin?

In Kotlin, interceptors and filters are both mechanisms used for intercepting and modifying requests and responses in an application, such as for logging, authentication, or encryption purposes. However, there are some key differences between the two:

  1. Interceptors are typically used in the context of HTTP clients or servers, where they intercept and modify requests and responses at a lower level than filters. Interceptors are usually used to add custom headers, logging, or authentication to each request and response.
  2. Filters are used in the context of web frameworks or servlet containers, where they intercept and modify requests and responses at a higher level than interceptors. Filters are used for tasks such as authorization, request parsing, response encoding, and more.
  3. Interceptors are specific to libraries or frameworks that support them, such as OkHttp or Retrofit, whereas filters are a common concept in web development and are often supported by web frameworks like Spring or Ktor.


In summary, interceptors are lower-level mechanisms for intercepting and modifying requests and responses in specific libraries or frameworks, while filters are higher-level mechanisms commonly used in web development for intercepting and modifying requests and responses in a broader context.

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