How to append Headers in Retrofit API call without using Interceptor

Question

I am using a base URL like below

private const val BASE_URL = "anyURL"

an htt*P client

private val client = OkHtttpClient.Builder().apply {
addInterceptor(MyInterceptor())
}.build()

a retrofit client

private val retrofit = Retrofit.Builder()
    .addConverterFactory(Json.asConverterFactory("application/json".toMediaType()))
    .client(client)
    .baseUrl(BASE_URL).build()

and a get call

@GET("playlist_tracks=*********")
suspend fun geAlltracks(): Music

Currently, I am using an interceptor, but how can append my request with headers without Interceptor

Rajkiran Swain · Answer

You can append headers in Retrofit API call without using an Interceptor by creating a custom OkHttpClient with headers and using it to build the Retrofit instance. Here is an example of how you can do that: Create an OkHttpClient with headers: private val headers = mapOf( Header1 to Value1 Header2 to Value2 ) private val client = OkHttpClient.Builder().apply { headers.forEach { (key value) -> addHeader(key value) } }.build() Use the custom client to build the Retrofit instance: private val retrofit = Retrofit.Builder() .addConverterFactory(Json.asConverterFactory(application/json.toMediaType())) .client(client) .baseUrl(BASE_URL).build() Make your API call as usual: @GET(playlist_tracks=*********) suspend fun geAlltracks(): Music In this way the custom OkHttpClient will automatically append the headers to every API call made by the Retrofit instance.