diff --git a/openapi3/requests.py b/openapi3/requests.py
index 951e978..37c9c1f 100644
--- a/openapi3/requests.py
+++ b/openapi3/requests.py
@@ -27,7 +27,7 @@ class TornadoRequestFactory:
             full_url_pattern=path,
             method=request.method.lower() if request.method else "get",
             parameters=RequestParameters(
-                query=query_arguments, header=Headers(request.headers)
+                query=query_arguments, header=Headers(request.headers.get_all())
             ),
             body=request.body.decode("utf-8"),
             mimetype="text/html",
diff --git a/tests/test_requests.py b/tests/test_requests.py
index 960c2c6..aff7255 100644
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -1,16 +1,47 @@
+from typing import Optional
 import unittest
+from urllib.parse import urlencode
 
 import attr
+from hypothesis import given
+import hypothesis.strategies as s
+from openapi_core import create_spec  # type: ignore
 from openapi_core.validation.request.datatypes import (  # type: ignore
     RequestParameters,
     OpenAPIRequest,
 )
-from tornado.httputil import HTTPServerRequest
+from openapi_core.validation.request.validators import RequestValidator  # type: ignore
+from tornado.httputil import HTTPHeaders, HTTPServerRequest
+from tornado.testing import AsyncHTTPTestCase
+from tornado.web import Application, RequestHandler
 from werkzeug.datastructures import ImmutableMultiDict
 
 from openapi3 import TornadoRequestFactory
 
 
+@s.composite
+def parameters(draw):
+    field_name = s.text(
+        s.characters(
+            min_codepoint=33,
+            max_codepoint=126,
+            blacklist_categories=("Lu",),
+            blacklist_characters=":",
+        ),
+        min_size=1,
+    )
+    field_value = s.text(
+        s.characters(
+            min_codepoint=0x20, max_codepoint=0x7E, blacklist_characters=" \r\n"
+        ),
+        min_size=1,
+    )
+    return {
+        "headers": draw(s.dictionaries(field_name, field_value)),
+        "query_parameters": draw(s.dictionaries(field_name, field_value)),
+    }
+
+
 class TestRequestFactory(unittest.TestCase):
     def test_request(self) -> None:
         tornado_request = HTTPServerRequest(
@@ -25,3 +56,61 @@ class TestRequestFactory(unittest.TestCase):
         )
         openapi_request = TornadoRequestFactory.create(tornado_request)
         self.assertEqual(attr.asdict(expected), attr.asdict(openapi_request))
+
+
+class TestRequest(AsyncHTTPTestCase):
+    def setUp(self) -> None:
+        super(TestRequest, self).setUp()
+        self.request: Optional[OpenAPIRequest] = None
+
+    def get_app(self) -> Application:
+        testcase = self
+
+        class TestHandler(RequestHandler):
+            def get(self) -> None:
+                nonlocal testcase
+                testcase.request = TornadoRequestFactory.create(self.request)
+
+        return Application([(r"/", TestHandler)])
+
+    @given(parameters())
+    def test_simple_request(self, parameters) -> None:
+        headers = [
+            {
+                "name": name.lower(),
+                "in": "header",
+                "required": True,
+                "schema": {"type": "string", "enum": [value]},
+            }
+            for name, value in parameters["headers"].items()
+        ]
+        qargs = [
+            {
+                "name": name.lower(),
+                "in": "query",
+                "required": True,
+                "schema": {"type": "string", "enum": [value]},
+            }
+            for name, value in parameters["query_parameters"].items()
+        ]
+        spec = create_spec(
+            {
+                "openapi": "3.0.0",
+                "info": {"title": "Test specification", "version": "0.1"},
+                "paths": {
+                    "/": {
+                        "get": {
+                            "parameters": headers + qargs,
+                            "responses": {"default": {"description": "Root response"}},
+                        }
+                    }
+                },
+            }
+        )
+        validator = RequestValidator(spec)
+        self.fetch(
+            "/?" + urlencode(parameters["query_parameters"]),
+            headers=HTTPHeaders(parameters["headers"]),
+        )
+        result = validator.validate(self.request)
+        result.raise_for_errors()