diff --git a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/OpenAIConfig.kt b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/OpenAIConfig.kt
index 3c4a39c7..82dae6c5 100644
--- a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/OpenAIConfig.kt
+++ b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/OpenAIConfig.kt
@@ -4,6 +4,7 @@ import com.aallam.openai.api.http.Timeout
 import com.aallam.openai.api.logging.LogLevel
 import com.aallam.openai.api.logging.Logger
 import io.ktor.client.HttpClientConfig
+import io.ktor.client.engine.HttpClientEngine
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
 
@@ -19,6 +20,7 @@ import kotlin.time.Duration.Companion.seconds
  * @param proxy HTTP proxy url
  * @param host OpenAI host configuration.
  * @param retry rate limit retry configuration
+ * @param engine explicit ktor engine for http requests.
  * @param httpClientConfig additional custom client configuration
  */
 public class OpenAIConfig(
@@ -30,6 +32,7 @@ public class OpenAIConfig(
     public val host: OpenAIHost = OpenAIHost.OpenAI,
     public val proxy: ProxyConfig? = null,
     public val retry: RetryStrategy = RetryStrategy(),
+    public val engine: HttpClientEngine? = null,
     public val httpClientConfig: HttpClientConfig<*>.() -> Unit = {}
 ) {
 
diff --git a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/HttpClient.kt b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/HttpClient.kt
index 29d25936..85280f74 100644
--- a/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/HttpClient.kt
+++ b/openai-client/src/commonMain/kotlin/com.aallam.openai.client/internal/HttpClient.kt
@@ -21,7 +21,7 @@ import kotlin.time.DurationUnit
  * Default Http Client.
  */
 internal fun createHttpClient(config: OpenAIConfig): HttpClient {
-    return HttpClient {
+    val configuration:  HttpClientConfig<*>.() -> Unit = {
         engine {
             config.proxy?.let { proxyConfig ->
                 proxy = when (proxyConfig) {
@@ -82,6 +82,12 @@ internal fun createHttpClient(config: OpenAIConfig): HttpClient {
 
         config.httpClientConfig(this)
     }
+
+    return if(config.engine != null) {
+        HttpClient(config.engine, configuration)
+    } else {
+        HttpClient(configuration)
+    }
 }
 
 /**