title: Unexpected char 0x20 at 3 in header name retrofit kotlin
body: <pre><code>@Headers("key : aW5kaWhvbWU", "Content-Type : application/json")
  @GET("product_cat/5")
  fun getProduct(
  ): Call&lt;ResponseListProduct&gt;
  
  val interceptor = HttpLoggingInterceptor().setLevel(HttpLoggingInterceptor.Level.BODY)
  val headerInterceptor = object: Interceptor {
  
      override fun intercept(chain: Interceptor.Chain): Response {
  
          var request = chain.request()
  
          request = request.newBuilder()
              .addHeader("key","aW5kaWhvbWU")
              .addHeader("Content-Type","application/json")
              .addHeader("cache-control", "no-cache")
              .addHeader("postman-token", "6b02e1a7-87dc-c814-6545-65325bcd1d3d")
              .build()
  
          val response = chain.proceed(request)
          return response
      }
  </code></pre>