diff --git a/pyinfra/rest.py b/pyinfra/rest.py
index b44eedf..698dfbc 100644
--- a/pyinfra/rest.py
+++ b/pyinfra/rest.py
@@ -1,10 +1,9 @@
-from itertools import chain, tee
 from operator import itemgetter
 from typing import Iterable
 
-from funcy import compose, first, rcompose, flatten
+from funcy import compose, first, flatten
 
-from pyinfra.utils.func import star, lift, lstarlift, starlift
+from pyinfra.utils.func import star, lift, lstarlift
 from test.utils.server import bytes_to_string, string_to_bytes
 
 
@@ -23,28 +22,35 @@ def bundle(data: bytes, metadata: dict):
     return package
 
 
+def normalize_up(x):
+    return [x] if isinstance(x, tuple) else x
+
+
+def normalize_down(itr):
+
+    head = first(itr)
+
+    if not head:
+        return []
+    elif isinstance(head, tuple):
+        return head, *itr
+    else:
+        return flatten((head, *itr))
+
+
 def unpack_op_pack(operation):
-    return compose(inspect("A2"), flatten, inspect("A1"), lstarlift(pack), star(operation), unpack)
+    return compose(lstarlift(pack), normalize_up, star(operation), unpack)
 
 
 def unpack_batchop_pack(operation):
-    raise BrokenPipeError
-    # return rcompose(
-    #     lift(unpack),  # unpack the buffer items
-    #     operation,  # apply operation on unpacked items
-    #     flatten,  # operations may be 1 -> 1, 1 -> n or n -> 1, hence flatten
-    #     lstarlift(pack),
-    # )
+    return compose(lstarlift(pack), normalize_down, operation, lift(unpack))
 
 
 def inspect(msg="ins"):
     def inner(x):
 
         if isinstance(x, Iterable) and not isinstance(x, dict):
-            print(11111111111111111111)
             x = list(x)
-        else:
-            print("00000000000")
 
         print(msg, x)
 
diff --git a/test/exploration_tests/partial_response_test.py b/test/exploration_tests/partial_response_test.py
index 84fa242..c93d9bb 100644
--- a/test/exploration_tests/partial_response_test.py
+++ b/test/exploration_tests/partial_response_test.py
@@ -6,8 +6,7 @@ from typing import Iterable
 
 import pytest
 import requests
-from funcy import rcompose, compose, rpartial, identity, lmap, ilen, first
-from more_itertools import flatten
+from funcy import rcompose, compose, rpartial, identity, lmap, ilen, first, flatten
 
 from pyinfra.rest import pack, unpack, bundle, inspect
 from pyinfra.utils.func import lift, starlift, parallel_map, star, lstarlift
@@ -22,7 +21,9 @@ def dispatch_methods(input_data):
 
 def post_partial(url, input_data: Iterable[bytes], metadata):
     def send(method, data):
-        return method(url, json=data)
+        response = method(url, json=data)
+        response.raise_for_status()
+        return response
 
     pack_data_and_metadata_for_rest_transfer = lift(rpartial(pack, metadata))
     dispatch_http_method_left_and_forward_data_right = parallel_map(dispatch_methods, lift(identity))
@@ -34,11 +35,8 @@ def post_partial(url, input_data: Iterable[bytes], metadata):
         pack_data_and_metadata_for_rest_transfer,
         dispatch_http_method_left_and_forward_data_right,
         send_data_with_method_to_analyzer,
-        inspect("B"),
         extract_payload_from_responses,
-        inspect("C"),
         flatten_buffered_payloads,
-        inspect("D"),
     )
 
     return input_data_to_result_data(input_data)
@@ -46,14 +44,8 @@ def post_partial(url, input_data: Iterable[bytes], metadata):
 
 @pytest.mark.parametrize("item_type", ["string"])
 def test_sending_partial_request(url, data_items, metadata, operation, server_process):
-    op = compose(lstarlift(pack), partial(operation, metadata=metadata))
-    expected = list(flatten(map(op, data_items)))
-    print()
-    print("exp")
-    print(expected)
+    op = compose(star(pack), partial(operation, metadata=metadata))
+    expected = lmap(op, data_items)
     output = list(post_partial(f"{url}/process", data_items, metadata))
-    print()
-    print("out")
-    print(output)
 
     assert output == expected
diff --git a/test/fixtures/server.py b/test/fixtures/server.py
index bf5940a..f3245c7 100644
--- a/test/fixtures/server.py
+++ b/test/fixtures/server.py
@@ -58,7 +58,7 @@ def processor_fn(operation, buffer_size, batched):
 @pytest.fixture
 def operation(item_type, batched):
     def upper(string: bytes, metadata):
-        return [(string.decode().upper().encode(), metadata)]
+        return string.decode().upper().encode(), metadata
 
     def rotate(im: bytes, metadata):
         im = Image.open(io.BytesIO(im))
@@ -79,7 +79,7 @@ def item_type(request):
     return request.param
 
 
-@pytest.fixture(params=[False])
+@pytest.fixture(params=[False, True])
 def batched(request):
     """Controls, whether the buffer processor function of the webserver is applied to batches or single items."""
     return request.param