feat(api): manual updates

openlayer-java-core/src/main/kotlin/com/openlayer/api/core/Utils.kt

@@ -39,18 +39,4 @@ internal fun <K, V> ListMultimap<K, V>.toUnmodifiable(): ListMultimap<K, V> {
     return Multimaps.unmodifiableListMultimap(this)
 }
 
-@JvmSynthetic
-internal fun ListMultimap<String, String>.getRequiredHeader(header: String): String {
-    val value =
-        entries()
-            .stream()
-            .filter { entry -> entry.key.equals(header, ignoreCase = true) }
-            .map { entry -> entry.value }
-            .findFirst()
-    if (!value.isPresent) {
-        throw OpenlayerInvalidDataException("Could not find $header header")
-    }
-    return value.get()
-}
-
 internal interface Enum

openlayer-java-core/src/main/kotlin/com/openlayer/api/core/http/RetryingHttpClient.kt

@@ -1,6 +1,5 @@
 package com.openlayer.api.core.http
 
-import com.google.common.util.concurrent.MoreExecutors
 import com.openlayer.api.core.RequestOptions
 import com.openlayer.api.errors.OpenlayerIoException
 import java.io.IOException
@@ -116,8 +115,10 @@ private constructor(
                             executeWithRetries(request, requestOptions)
                         }
                     },
-                    MoreExecutors.directExecutor()
-                )
+                ) {
+                    // Run in the same thread.
+                    it.run()
+                }
                 .thenCompose(Function.identity())
         }