add WebClientConfiguration

src/main/kotlin/ltd/hlaeja/configuration/WebClientConfiguration.kt

@@ -0,0 +1,16 @@
+package ltd.hlaeja.configuration
+
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import org.springframework.http.HttpHeaders.CONTENT_TYPE
+import org.springframework.http.MediaType.APPLICATION_JSON_VALUE
+import org.springframework.web.reactive.function.client.WebClient
+
+@Configuration
+class WebClientConfiguration {
+
+    @Bean
+    fun webClient(): WebClient = WebClient.builder()
+        .defaultHeader(CONTENT_TYPE, APPLICATION_JSON_VALUE)
+        .build()
+}