Java 15035 (#13421)

* [JAVA-15035] Created module httpclient4 and moved related code

* [JAVA-15035] Upgraded httpclient-simple to spring-boot-e

* [JAVA-15035] Moved modules to to right profiles

* [JAVA-15026] Upgraded headers code to apache 5.2 + moved code related to 4.5 to httpclient4 module

* [JAVA-14911] Final clean up for http-client module

---------

Co-authored-by: panagiotiskakos <panagiotis.kakos@libra-is.com>

httpclient4/src/test/java/com/baeldung/httpclient/HttpClientHeaderV4LiveTest.java

@@ -0,0 +1,24 @@
+package com.baeldung.httpclient;
+
+import java.io.IOException;
+import org.apache.http.HttpHeaders;
+import org.apache.http.client.HttpClient;
+import org.apache.http.client.methods.HttpUriRequest;
+import org.apache.http.client.methods.RequestBuilder;
+import org.apache.http.impl.client.HttpClients;
+import org.junit.jupiter.api.Test;
+
+class HttpClientHeaderV4LiveTest {
+
+    private static final String SAMPLE_URL = "http://www.github.com";
+
+    @Test
+    void givenRequestBuildWithBuilder_whenRequestHasCustomContentType_thenCorrect() throws IOException {
+        HttpClient client = HttpClients.custom().build();
+        HttpUriRequest request = RequestBuilder.get()
+            .setUri(SAMPLE_URL)
+            .setHeader(HttpHeaders.CONTENT_TYPE, "application/json")
+            .build();
+        client.execute(request);
+    }
+}