diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
index e306d63..bd70e5c 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
@@ -30,11 +30,29 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 	
 	private static final Logger logger = LoggerFactory.getLogger(ResourceRegistrySchemaClientImpl.class);
 	
+	private static final String ACCEPT_HTTP_HEADER_KEY = "Accept";
+	private static final String CONTENT_TYPE_HTTP_HEADER_KEY = "Content-Type";
+	
 	protected final String address;
 	
+	protected Map<String, String> headers;
+	
+	public void addHeader(String name, String value) {
+		headers.put(name, value);
+	}
+	
+	protected GXHTTPStringRequest getGXHTTPStringRequest() {
+		GXHTTPStringRequest gxHTTPStringRequest = GXHTTPUtility.getGXHTTPStringRequest(address);
+		gxHTTPStringRequest.from(this.getClass().getSimpleName());
+		for(String name : headers.keySet()) {
+			gxHTTPStringRequest.header(name, headers.get(name));
+		}
+		return gxHTTPStringRequest;
+	}
+	
 	public ResourceRegistrySchemaClientImpl(String address) {
 		this.address = address;
-		
+		this.headers = new HashMap<>();
 	}
 	
 	@Override
@@ -58,10 +76,9 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 			logger.trace("Going to create: {}", typeDefinitition);
 			Type typeDefinitionObj = TypeMapper.deserializeTypeDefinition(typeDefinitition);
 			
-			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPUtility.getGXHTTPStringRequest(address);
-			gxHTTPStringRequest.from(ResourceRegistrySchemaClient.class.getSimpleName());
-			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
-			gxHTTPStringRequest.header("Content-type", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
+			GXHTTPStringRequest gxHTTPStringRequest = getGXHTTPStringRequest();
+			gxHTTPStringRequest.header(ACCEPT_HTTP_HEADER_KEY, GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
+			gxHTTPStringRequest.header(CONTENT_TYPE_HTTP_HEADER_KEY, GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
 			gxHTTPStringRequest.path(TypePath.TYPES_PATH_PART);
 			gxHTTPStringRequest.path(typeDefinitionObj.getName());
 			
@@ -94,9 +111,8 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 	public boolean exist(String typeName) throws ResourceRegistryException {
 		try {
 			logger.info("Going to get {} schema", typeName);
-			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPUtility.getGXHTTPStringRequest(address);
-			gxHTTPStringRequest.from(ResourceRegistrySchemaClient.class.getSimpleName());
-			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
+			GXHTTPStringRequest gxHTTPStringRequest = getGXHTTPStringRequest();
+			gxHTTPStringRequest.header(ACCEPT_HTTP_HEADER_KEY, GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
 			gxHTTPStringRequest.path(TypePath.TYPES_PATH_PART);
 			gxHTTPStringRequest.path(typeName);
 			
@@ -136,9 +152,8 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 	public String read(String typeName, Boolean polymorphic) throws ContextNotFoundException, ResourceRegistryException {
 		try {
 			logger.info("Going to get {} schema", typeName);
-			GXHTTPStringRequest gxHTTPStringRequest = GXHTTPUtility.getGXHTTPStringRequest(address);
-			gxHTTPStringRequest.from(ResourceRegistrySchemaClient.class.getSimpleName());
-			gxHTTPStringRequest.header("Accept", GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
+			GXHTTPStringRequest gxHTTPStringRequest = getGXHTTPStringRequest();
+			gxHTTPStringRequest.header(ACCEPT_HTTP_HEADER_KEY, GXConnection.APPLICATION_JSON_CHARSET_UTF_8);
 			gxHTTPStringRequest.path(TypePath.TYPES_PATH_PART);
 			gxHTTPStringRequest.path(typeName);