How to append Headers in Retrofit API call without using Interceptor

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:

1.  
2. 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()
   

    

3. Use the custom client to build the Retrofit instance:

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

    

1. 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.