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- OkHttp is a mechanism that helps you
monitor
and re-write network calls. - In the image below we can see that a call is sent from the application
->
Then it is received by the interceptor and modified->
Then further modified call is received at the server.
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- We can chain multiple interceptors and modify the request
- Order of the chaining is important
- Okhttp keeps a list of interceptors and processes them in the same order in which they are added
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There are two types of interceptors
- Application Interceptors
- Network Interceptors
Application Interceptors |
Network Interceptors |
---|---|
The application interceptors are the type of interceptors that are found between the application and the okhttp module . |
The network interceptors are the type of interceptors that are found between the okhttp module and remote server . |
They are not concerned with the intermediate responses and focus on the final response sent to the application. | They are concerned with the intermediary responses from the time of application making the call and receiving the final response. |
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- Even here we customize the regular interceptor to send certain specific user data to the server on each API request
- Suppose again if we are sending information like
Device-ID
,OS-version
etc to the server to understand the customer who is using the API service. - Now again instead of sending these details which can be of any length, we can send it from one place having a common interceptor
class AnalyticsInterceptor(private val context: Context): Interceptor {
private val APP_VERSION = "X-App-Version"
private val DEVICE_MODEL = "X-Device-Model"
private val DEVICE_PLATFORM = "X-Device-Platform"
private val OS_VERSION = "X-Device-OS-Version"
override fun intercept(chain: Interceptor.Chain): Response {
val request: Request = chain.request()
val requestBuilder: Request.Builder = request.newBuilder()
val packageInfo = context.packageManager.getPackageInfo(context.packageName, 0)
val version = packageInfo.versionName
requestBuilder.addHeader(APP_VERSION, version)
requestBuilder.addHeader(OS_VERSION, Build.VERSION.SDK_INT.toString())
requestBuilder.addHeader(DEVICE_MODEL, Build.MODEL)
requestBuilder.addHeader(DEVICE_PLATFORM, "android")
return chain.proceed(requestBuilder.build())
}
}
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- There is no such special thing as
ApiKey
ortolken
Interceptor. - We customize the interceptor in such a way
- Suppose in every API request we want to pass an auth token to the server in the header.
- We need not have to pass while creating every API request.
- Instead of it we can pass it in a custom interceptor
class ApiKeyInterceptor: Interceptor {
private val apiKeyQueryParameterKey = "api_key"
override fun intercept(chain: Interceptor.Chain): Response {
val originalRequest = chain.request()
val originalUrl = originalRequest.url
val url = originalUrl.newBuilder()
.addQueryParameter(apiKeyQueryParameterKey, BuildConfig.THE_MOVIE_DB_API_TOKEN)
.build()
val newRequest = originalRequest.newBuilder()
.url(url)
.build()
return chain.proceed(newRequest)
}
}
- Add the object while creating the
okhttp
request
val okHttpClient = OkHttpClient.Builder()
.readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.addInterceptor(ApiKeyInterceptor())
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- The HTTP Logging Interceptor is an interceptor that helps to log all the HTTP requests that are being sent to the server.
- It also can log all the responses that are sent from the server to the application.
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- It is helpful in debugging the application on network-related issues when building the application.
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- This is the ability to remove certain information from logging in to the terminal.
- For example, we can remove the API key getting logged if it is sent in a request to the server.
- Add the code
val loggingInterceptor = HttpLoggingInterceptor { message -> Timber.tag("OkHttp").d(message) }
loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
loggingInterceptor.redactHeader("x-amz-cf-id")
- And add it while building the
okhttp
client
object OkHttpProvider {
// Timeout for the network requests
private const val REQUEST_TIMEOUT = 3L
private var okHttpClient: OkHttpClient? = null
fun getOkHttpClient(context: Context): OkHttpClient {
return if (okHttpClient == null) {
val loggingInterceptor = HttpLoggingInterceptor { message -> Timber.tag("OkHttp").d(message) }
loggingInterceptor.level = HttpLoggingInterceptor.Level.BODY
loggingInterceptor.redactHeader("x-amz-cf-id")
val okHttpClient = OkHttpClient.Builder()
.readTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.connectTimeout(REQUEST_TIMEOUT, TimeUnit.SECONDS)
.addInterceptor(loggingInterceptor)
.build()
OkHttpProvider.okHttpClient = okHttpClient
okHttpClient
} else {
okHttpClient!!
}
}
}
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