Adding a response in JSON format

Author: nip24pl

pom.xml

@@ -5,7 +5,7 @@
 
 	<groupId>pl.nip24</groupId>
 	<artifactId>nip24-client</artifactId>
-	<version>1.3.9</version>
+	<version>1.4.0</version>
 
 	<name>nip24-java-client</name>
 	<description>NIP24 Service Client for Java</description>
@@ -47,25 +47,28 @@
 		<java.version>11</java.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-		<swagger.version>2.2.8</swagger.version>
-		<jackson.version>2.14.2</jackson.version>
+		<swagger.version>2.2.16</swagger.version>
+		<jackson.version>2.15.2</jackson.version>
 	</properties>
 
 	<build>
 		<plugins>
+			<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-compiler-plugin -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.10.1</version>
+				<version>3.11.0</version>
 				<configuration>
 					<source>${java.version}</source>
 					<target>${java.version}</target>
 				</configuration>
 			</plugin>
+
+			<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-source-plugin -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
-				<version>3.2.1</version>
+				<version>3.3.0</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -75,10 +78,12 @@
 					</execution>
 				</executions>
 			</plugin>
+
+			<!-- https://mvnrepository.com/artifact/org.apache.maven.plugins/maven-javadoc-plugin -->
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
-				<version>3.4.1</version>
+				<version>3.6.0</version>
 				<executions>
 					<execution>
 						<id>attach-javadocs</id>

src/main/java/pl/nip24/client/NIP24Client.java

@@ -52,7 +52,7 @@
  */
 public class NIP24Client {
 
-	public final static String VERSION = "1.3.9";
+	public final static String VERSION = "1.4.0";
 
 	public final static String PRODUCTION_URL = "https://www.nip24.pl/api";
 	public final static String TEST_URL = "https://www.nip24.pl/api-test";
@@ -1068,7 +1068,7 @@ public KRSData getKRSSection(Number type, String number, int section)
 			String url = (this.url.toString()  + "/get/krs/current/" + suffix + "/" + section);
 
 			// prepare request
-			byte[] b = get(url);
+			byte[] b = get(url, "application/json");
 
 			if (b == null) {
 				set(Error.CLI_CONNECT);
@@ -1268,11 +1268,12 @@ private ObjectMapper getObjectMapper()
 
 	/**
 	 * Przygotowanie nagłówka z danymi do autoryzacji zapytania
+     * @param headers obiekt z nagłówkami HTTP
 	 * @param method metoda HTTP
 	 * @param url docelowy adres URL
 	 * @return nagłówki HTTP lub null
 	 */
-	private Properties auth(String method, URL url)
+	private boolean auth(Properties headers, String method, URL url)
 	{
 		try {
 			// prepare auth header
@@ -1291,21 +1292,19 @@ private Properties auth(String method, URL url)
 			String mac = getMac(str);
 
 			if (mac == null) {
-				return null;
+				return false;
 			}
 
 			// prepare request
-			Properties p = new Properties();
-			
-			p.setProperty("Authorization", "MAC id=\"" + id + "\", ts=\"" + ts + "\", nonce=\""
+            headers.setProperty("Authorization", "MAC id=\"" + id + "\", ts=\"" + ts + "\", nonce=\""
 				+ nonce + "\", mac=\"" + mac + "\"");
 
-			return p;
+			return true;
 		}
 		catch (Exception ignored) {
 		}
 
-		return null;
+		return false;
 	}
 
 	/**
@@ -1320,9 +1319,10 @@ private void userAgent(Properties headers)
 	/**
 	 * Metoda HTTP GET
 	 * @param url adres URL
+     * @param mimetype typ MIME odpowiedzi (application/xml lub application/json)
 	 * @return pobrana odpowiedź lub null
 	 */
-	private byte[] get(String url)
+	private byte[] get(String url, String mimetype)
 	{
 		boolean set = false;
 
@@ -1343,10 +1343,12 @@ private byte[] get(String url)
 				set = true;
 			}
 
-			// auth
-			Properties headers = auth("GET", u);
-			
-			if (headers == null) {
+			// headers
+			Properties headers = new Properties();
+
+            headers.setProperty("Accept", mimetype);
+
+            if (!auth(headers, "GET", u)) {
 				return null;
 			}
 
@@ -1420,6 +1422,16 @@ else if (url.toLowerCase().startsWith("http://")) {
 		return null;
 	}
 
+    /**
+     * Metoda HTTP GET
+     * @param url adres URL
+     * @return pobrana odpowiedź lub null
+     */
+    private byte[] get(String url)
+    {
+        return get(url, "application/xml");
+    }
+
 	/**
 	 * Odczyt zawartosci calego strumienia do tablicy
 	 * @param stream strumien wejsciowy