diff --git a/docs_src/app_testing/app_b_an_py310/main.py b/docs_src/app_testing/app_b_an_py310/main.py
index c5952be0b..120289f56 100644
--- a/docs_src/app_testing/app_b_an_py310/main.py
+++ b/docs_src/app_testing/app_b_an_py310/main.py
@@ -28,8 +28,8 @@ async def read_main(item_id: str, x_token: Annotated[str, Header()]):
     return fake_db[item_id]
 
 
-@app.post("/items/", response_model=Item)
-async def create_item(item: Item, x_token: Annotated[str, Header()]):
+@app.post("/items/")
+async def create_item(item: Item, x_token: Annotated[str, Header()]) -> Item:
     if x_token != fake_secret_token:
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
diff --git a/docs_src/app_testing/app_b_an_py39/main.py b/docs_src/app_testing/app_b_an_py39/main.py
index 142e23a26..801d5f21e 100644
--- a/docs_src/app_testing/app_b_an_py39/main.py
+++ b/docs_src/app_testing/app_b_an_py39/main.py
@@ -28,8 +28,8 @@ async def read_main(item_id: str, x_token: Annotated[str, Header()]):
     return fake_db[item_id]
 
 
-@app.post("/items/", response_model=Item)
-async def create_item(item: Item, x_token: Annotated[str, Header()]):
+@app.post("/items/")
+async def create_item(item: Item, x_token: Annotated[str, Header()]) -> Item:
     if x_token != fake_secret_token:
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
diff --git a/docs_src/app_testing/app_b_py310/main.py b/docs_src/app_testing/app_b_py310/main.py
index eccedcc7c..6c5c34130 100644
--- a/docs_src/app_testing/app_b_py310/main.py
+++ b/docs_src/app_testing/app_b_py310/main.py
@@ -26,8 +26,8 @@ async def read_main(item_id: str, x_token: str = Header()):
     return fake_db[item_id]
 
 
-@app.post("/items/", response_model=Item)
-async def create_item(item: Item, x_token: str = Header()):
+@app.post("/items/")
+async def create_item(item: Item, x_token: str = Header()) -> Item:
     if x_token != fake_secret_token:
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db:
diff --git a/docs_src/app_testing/app_b_py39/main.py b/docs_src/app_testing/app_b_py39/main.py
index 45a103378..89053c432 100644
--- a/docs_src/app_testing/app_b_py39/main.py
+++ b/docs_src/app_testing/app_b_py39/main.py
@@ -28,8 +28,8 @@ async def read_main(item_id: str, x_token: str = Header()):
     return fake_db[item_id]
 
 
-@app.post("/items/", response_model=Item)
-async def create_item(item: Item, x_token: str = Header()):
+@app.post("/items/")
+async def create_item(item: Item, x_token: str = Header()) -> Item:
     if x_token != fake_secret_token:
         raise HTTPException(status_code=400, detail="Invalid X-Token header")
     if item.id in fake_db: