diff --git a/src/main/java/io/carbynestack/httpclient/CsResponseHandler.java b/src/main/java/io/carbynestack/httpclient/CsResponseHandler.java
index 52dffb1..51d38e2 100644
--- a/src/main/java/io/carbynestack/httpclient/CsResponseHandler.java
+++ b/src/main/java/io/carbynestack/httpclient/CsResponseHandler.java
@@ -36,14 +36,21 @@ public static <L, R> CsResponseHandler<L, R> of(
   public CsResponseEntity<L, R> handleResponse(HttpResponse response) throws IOException {
     int status = response.getStatusLine().getStatusCode();
     HttpEntity entity = response.getEntity();
-    String contentString = entity != null ? EntityUtils.toString(entity) : null;
+
     if (status >= 200 && status < 300) {
+      if (this.successType.equals(byte[].class)) {
+        // for TupleLists serialized as Bytes
+        byte[] contentByteArray = entity != null ? EntityUtils.toByteArray(entity) : null;
+        return (CsResponseEntity<L, R>) CsResponseEntity.success(status, contentByteArray);
+      }
+      String contentString = entity != null ? EntityUtils.toString(entity) : null;
       return CsResponseEntity.success(
           status,
           contentString != null && !contentString.isEmpty()
               ? OBJECT_MAPPER.readValue(contentString, successType)
               : null);
     } else {
+      String contentString = entity != null ? EntityUtils.toString(entity) : null;
       log.debug(String.format("Request failed with status code <%s>: %s", status, contentString));
       return CsResponseEntity.failed(
           status,
diff --git a/src/test/java/io/carbynestack/httpclient/CsResponseHandlerTest.java b/src/test/java/io/carbynestack/httpclient/CsResponseHandlerTest.java
index 254289b..7c5d9ad 100644
--- a/src/test/java/io/carbynestack/httpclient/CsResponseHandlerTest.java
+++ b/src/test/java/io/carbynestack/httpclient/CsResponseHandlerTest.java
@@ -29,6 +29,8 @@ public class CsResponseHandlerTest {
   private static final Random RANDOM = new Random();
   private static final CsResponseHandler<String, String> RESPONSE_HANDLER =
       CsResponseHandler.of(String.class, String.class);
+  private static final CsResponseHandler<String, byte[]> OCTET_RESPONSE_HANDLER =
+      CsResponseHandler.of(String.class, byte[].class);
 
   private static HttpResponse getHttpResponseForObject(int httpStatus, Object obj) {
     StatusLine statusLine = new BasicStatusLine(HttpVersion.HTTP_1_1, httpStatus, null);
@@ -48,6 +50,16 @@ private static HttpResponse getHttpResponseForObject(int httpStatus, Object obj)
     return response;
   }
 
+  private static HttpResponse getHttpResponseForByteArr(int httpStatus, byte[] bytes) {
+    StatusLine statusLine = new BasicStatusLine(HttpVersion.HTTP_1_1, httpStatus, null);
+    HttpResponse response = new BasicHttpResponse(statusLine);
+    BasicHttpEntity httpEntity = new BasicHttpEntity();
+    httpEntity.setContent(new ByteArrayInputStream(bytes));
+    httpEntity.setContentLength(bytes.length);
+    response.setEntity(httpEntity);
+    return response;
+  }
+
   @SuppressWarnings("unchecked")
   private static <E extends Throwable> String writeObjectAsJsonString(Object obj) throws E {
     try {
@@ -57,6 +69,17 @@ private static <E extends Throwable> String writeObjectAsJsonString(Object obj)
     }
   }
 
+  @Test
+  public void givenSuccessfulRequestForTupleList_whenHandlingResponse_thenReturnSuccesful()
+      throws IOException {
+    byte[] content = new byte[] {1, 2, 3, 5, 3, 5, 6};
+    int httpStatus = HttpStatus.SC_OK;
+    HttpResponse httpResponse = getHttpResponseForByteArr(httpStatus, content);
+    CsResponseEntity<String, byte[]> actualResponse =
+        OCTET_RESPONSE_HANDLER.handleResponse(httpResponse);
+    assertThat(actualResponse.get()).isEqualTo(content);
+  }
+
   @Test
   public void givenSuccessfulRequestWithValidBody_whenHandlingResponse_thenReturnSuccessful()
       throws IOException {