diff --git a/common/src/commonMain/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfig.kt b/common/src/commonMain/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfig.kt
index f094332..cdba069 100644
--- a/common/src/commonMain/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfig.kt
+++ b/common/src/commonMain/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfig.kt
@@ -2,6 +2,6 @@ package com.tddworks.common.network.api.ktor.internal
 
 data class HostPortConnectionConfig(
     val protocol: () -> String? = { null },
-    val host: () -> String = { "" },
     val port: () -> Int? = { null },
+    val host: () -> String,
 ) : ConnectionConfig
\ No newline at end of file
diff --git a/common/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HttpClientTest.kt b/common/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HttpClientTest.kt
index 7dd8b20..3754ecc 100644
--- a/common/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HttpClientTest.kt
+++ b/common/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HttpClientTest.kt
@@ -31,8 +31,8 @@ class HttpClientTest {
             val apiClient = createHttpClient(
                 connectionConfig = HostPortConnectionConfig(
                     protocol = { "https" },
-                    host = { "some-host" },
-                    port = { 443 }
+                    port = { 443 },
+                    host = { "some-host" }
                 ),
                 httpClientEngine = mockEngine,
                 authConfig = AuthConfig(authToken = { "token" }),
@@ -50,8 +50,8 @@ class HttpClientTest {
         val apiClient = createHttpClient(
             connectionConfig = HostPortConnectionConfig(
                 protocol = { "https" },
-                host = { "some-host" },
-                port = { 443 }
+                port = { 443 },
+                host = { "some-host" }
             ),
             httpClientEngine = mockEngine
         )
diff --git a/openai-client/openai-client-core/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfigTest.kt b/openai-client/openai-client-core/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfigTest.kt
new file mode 100644
index 0000000..be5f578
--- /dev/null
+++ b/openai-client/openai-client-core/src/jvmTest/kotlin/com/tddworks/common/network/api/ktor/internal/HostPortConnectionConfigTest.kt
@@ -0,0 +1,30 @@
+package com.tddworks.common.network.api.ktor.internal
+
+import org.junit.jupiter.api.Assertions.*
+import org.junit.jupiter.api.Test
+
+class HostPortConnectionConfigTest {
+
+    @Test
+    fun `should return default protocol and port`() {
+        val config = HostPortConnectionConfig { "example.com" }
+
+        assertNull(config.protocol(), "Protocol should default to null")
+
+        assertNull(config.port(), "Port should default to null")
+    }
+
+    @Test
+    fun `should able to specified protocol and port`() {
+        val protocol: () -> String? = { "http" }
+        val port: () -> Int? = { 8080 }
+        val config = HostPortConnectionConfig(
+            protocol = protocol,
+            port = port,
+            host = { "example.com" }
+        )
+
+        assertEquals("http", config.protocol(), "Protocol should be 'http'")
+        assertEquals(8080, config.port(), "Port should be 8080")
+    }
+}
\ No newline at end of file