diff --git a/pyinfra/server/bufferizer/lazy_bufferizer.py b/pyinfra/server/bufferizer/lazy_bufferizer.py
index 090b285..75a6897 100644
--- a/pyinfra/server/bufferizer/lazy_bufferizer.py
+++ b/pyinfra/server/bufferizer/lazy_bufferizer.py
@@ -2,7 +2,7 @@ import logging
 from collections import deque
 from itertools import chain, takewhile
 
-from funcy import first, repeatedly
+from funcy import first, repeatedly, compose
 
 from pyinfra.server.bufferizer.buffer import bufferize
 from pyinfra.server.dispatcher.dispatcher import Nothing, is_not_nothing
@@ -119,19 +119,15 @@ class StreamBuffer:
 #         return Nothing
 
 
-def make_queue_consumer(buffer: StreamBuffer):
+def make_consumer(buffer: StreamBuffer):
 
-    def compute_next(queue):
-        return next(compute(queue))
-
-    def compute(queue):
-        yield from consume_queue(queue)
+    def compute(items):
+        yield from consume(items)
         yield from flush_buffer()
         yield signal_termination()
 
-    def consume_queue(queue):
-        queue_items = stream_queue(queue)
-        yield from chain.from_iterable(map(buffer, queue_items))
+    def consume(items):
+        yield from chain.from_iterable(map(buffer, items))
 
     def flush_buffer():
         yield from buffer(Nothing)
@@ -139,7 +135,7 @@ def make_queue_consumer(buffer: StreamBuffer):
     def signal_termination():
         return Nothing
 
-    return compute_next
+    return compose(first, compute)
 
 
 def stream_queue(queue):
diff --git a/pyinfra/server/server.py b/pyinfra/server/server.py
index f24cdeb..af718d3 100644
--- a/pyinfra/server/server.py
+++ b/pyinfra/server/server.py
@@ -3,7 +3,7 @@ import logging
 from flask import Flask, jsonify, request
 from funcy import compose, identity
 
-from pyinfra.server.bufferizer.lazy_bufferizer import Queue, StreamBuffer, make_queue_consumer
+from pyinfra.server.bufferizer.lazy_bufferizer import Queue, StreamBuffer, stream_queue, make_consumer
 from pyinfra.server.dispatcher.dispatcher import Nothing
 from pyinfra.server.utils import unpack, normalize, pack
 from pyinfra.utils.func import starlift, lift
@@ -44,14 +44,14 @@ class RestStreamProcessor:
         self.queue = Queue()
         # self.processor = QueueBufferCoupler(self.queue, StreamBuffer(fn))
         # self.output_stream = chain.from_iterable(map(StreamBuffer(fn), stream_queue(self.queue)))
-        self.fn = make_queue_consumer(StreamBuffer(fn))
+        self.fn = make_consumer(StreamBuffer(fn))
 
     def submit(self, request):
         self.queue.append(request.json)
         return jsonify(request.base_url.replace(self.submit_suffix, self.pickup_suffix))
 
     def pickup(self):
-        result = self.fn(self.queue)
+        result = self.fn(stream_queue(self.queue))
 
         if not valid(result):
             logger.error(f"Received invalid result: {result}")
diff --git a/test/fixtures/server.py b/test/fixtures/server.py
index ef6bb83..494ddc0 100644
--- a/test/fixtures/server.py
+++ b/test/fixtures/server.py
@@ -51,10 +51,14 @@ def operation_conditionally_batched(operation, batched):
 
 
 @pytest.fixture
-def operation(item_type, batched):
+def operation(item_type, batched, one_to_many):
     def upper(string: bytes, metadata):
         return string.decode().upper().encode(), metadata
 
+    def duplicate(string: bytes, metadata):
+        for _ in range(2):
+            yield upper(string, metadata)
+
     def rotate(im: bytes, metadata):
         im = Image.open(io.BytesIO(im))
         return image_to_bytes(im.rotate(90)), metadata
@@ -65,7 +69,7 @@ def operation(item_type, batched):
             yield f"page_{i}".encode(), metadata
 
     try:
-        return {"string": upper, "image": rotate, "pdf": stream_pages}[item_type]
+        return {"string": duplicate if one_to_many else upper, "image": rotate, "pdf": stream_pages}[item_type]
     except KeyError:
         raise ValueError(f"No operation specified for item type {item_type}")
 
@@ -75,6 +79,11 @@ def item_type(request):
     return request.param
 
 
+@pytest.fixture(params=[True, False])
+def one_to_many(request):
+    return request.param
+
+
 @pytest.fixture(params=[False, True])
 def batched(request):
     """Controls, whether the buffer processor function of the webserver is applied to batches or single items."""