diff --git a/homeassistant/components/hassio/http.py b/homeassistant/components/hassio/http.py
index 6dccdeb2101..aba0dac6494 100644
--- a/homeassistant/components/hassio/http.py
+++ b/homeassistant/components/hassio/http.py
@@ -18,6 +18,7 @@ from .const import X_HASS_IS_ADMIN, X_HASS_USER_ID, X_HASSIO
 
 _LOGGER = logging.getLogger(__name__)
 
+MAX_UPLOAD_SIZE = 1024 * 1024 * 1024
 
 NO_TIMEOUT = re.compile(
     r"^(?:"
@@ -71,6 +72,16 @@ class HassIOView(HomeAssistantView):
         read_timeout = _get_timeout(path)
         data = None
         headers = _init_header(request)
+        if path == "snapshots/new/upload":
+            # We need to reuse the full content type that includes the boundary
+            headers[
+                "Content-Type"
+            ] = request._stored_content_type  # pylint: disable=protected-access
+
+            # Snapshots are big, so we need to adjust the allowed size
+            request._client_max_size = (  # pylint: disable=protected-access
+                MAX_UPLOAD_SIZE
+            )
 
         try:
             with async_timeout.timeout(10):
diff --git a/tests/components/hassio/test_http.py b/tests/components/hassio/test_http.py
index 7386cf57d0c..195a8652e2f 100644
--- a/tests/components/hassio/test_http.py
+++ b/tests/components/hassio/test_http.py
@@ -129,3 +129,21 @@ async def test_forwarding_user_info(hassio_client, hass_admin_user, aioclient_mo
     req_headers = aioclient_mock.mock_calls[0][-1]
     req_headers["X-Hass-User-ID"] == hass_admin_user.id
     req_headers["X-Hass-Is-Admin"] == "1"
+
+
+async def test_snapshot_upload_headers(hassio_client, aioclient_mock):
+    """Test that we forward the full header for snapshot upload."""
+    content_type = "multipart/form-data; boundary='--webkit'"
+    aioclient_mock.get("http://127.0.0.1/snapshots/new/upload")
+
+    resp = await hassio_client.get(
+        "/api/hassio/snapshots/new/upload", headers={"Content-Type": content_type}
+    )
+
+    # Check we got right response
+    assert resp.status == 200
+
+    assert len(aioclient_mock.mock_calls) == 1
+
+    req_headers = aioclient_mock.mock_calls[0][-1]
+    req_headers["Content-Type"] == content_type