diff --git a/docs_src/header_param_models/tutorial003.py b/docs_src/header_param_models/tutorial003.py
new file mode 100644
index 000000000..dc2eb74bd
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003.py
@@ -0,0 +1,19 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header(convert_underscores=False)):
+    return headers
diff --git a/docs_src/header_param_models/tutorial003_an.py b/docs_src/header_param_models/tutorial003_an.py
new file mode 100644
index 000000000..e3edb1189
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003_an.py
@@ -0,0 +1,22 @@
+from typing import List, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+from typing_extensions import Annotated
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: List[str] = []
+
+
+@app.get("/items/")
+async def read_items(
+    headers: Annotated[CommonHeaders, Header(convert_underscores=False)],
+):
+    return headers
diff --git a/docs_src/header_param_models/tutorial003_an_py310.py b/docs_src/header_param_models/tutorial003_an_py310.py
new file mode 100644
index 000000000..07bfa83bf
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003_an_py310.py
@@ -0,0 +1,21 @@
+from typing import Annotated
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(
+    headers: Annotated[CommonHeaders, Header(convert_underscores=False)],
+):
+    return headers
diff --git a/docs_src/header_param_models/tutorial003_an_py39.py b/docs_src/header_param_models/tutorial003_an_py39.py
new file mode 100644
index 000000000..8be6b01d0
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003_an_py39.py
@@ -0,0 +1,21 @@
+from typing import Annotated, Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(
+    headers: Annotated[CommonHeaders, Header(convert_underscores=False)],
+):
+    return headers
diff --git a/docs_src/header_param_models/tutorial003_py310.py b/docs_src/header_param_models/tutorial003_py310.py
new file mode 100644
index 000000000..65e92a28c
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003_py310.py
@@ -0,0 +1,17 @@
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: str | None = None
+    traceparent: str | None = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header(convert_underscores=False)):
+    return headers
diff --git a/docs_src/header_param_models/tutorial003_py39.py b/docs_src/header_param_models/tutorial003_py39.py
new file mode 100644
index 000000000..848c34111
--- /dev/null
+++ b/docs_src/header_param_models/tutorial003_py39.py
@@ -0,0 +1,19 @@
+from typing import Union
+
+from fastapi import FastAPI, Header
+from pydantic import BaseModel
+
+app = FastAPI()
+
+
+class CommonHeaders(BaseModel):
+    host: str
+    save_data: bool
+    if_modified_since: Union[str, None] = None
+    traceparent: Union[str, None] = None
+    x_tag: list[str] = []
+
+
+@app.get("/items/")
+async def read_items(headers: CommonHeaders = Header(convert_underscores=False)):
+    return headers