diff --git a/sdk/python/feast/feature_server.py b/sdk/python/feast/feature_server.py
index 2b222b1ad4..26ee604e79 100644
--- a/sdk/python/feast/feature_server.py
+++ b/sdk/python/feast/feature_server.py
@@ -1,10 +1,9 @@
-import json
 import sys
 import threading
 import time
 import traceback
 from contextlib import asynccontextmanager
-from typing import List, Optional
+from typing import Any, Dict, List, Optional
 
 import pandas as pd
 import psutil
@@ -69,6 +68,13 @@ class MaterializeIncrementalRequest(BaseModel):
     feature_views: Optional[List[str]] = None
 
 
+class GetOnlineFeaturesRequest(BaseModel):
+    entities: Dict[str, List[Any]]
+    feature_service: Optional[str] = None
+    features: Optional[List[str]] = None
+    full_feature_names: bool = False
+
+
 def get_app(
     store: "feast.FeatureStore",
     registry_ttl_sec: int = DEFAULT_FEATURE_SERVER_REGISTRY_TTL,
@@ -108,33 +114,26 @@ async def lifespan(app: FastAPI):
 
     app = FastAPI(lifespan=lifespan)
 
-    async def get_body(request: Request):
-        return await request.body()
-
     @app.post(
         "/get-online-features",
         dependencies=[Depends(inject_user_details)],
     )
-    async def get_online_features(body=Depends(get_body)):
-        body = json.loads(body)
-        full_feature_names = body.get("full_feature_names", False)
-        entity_rows = body["entities"]
+    async def get_online_features(request: GetOnlineFeaturesRequest) -> Dict[str, Any]:
         # Initialize parameters for FeatureStore.get_online_features(...) call
-        if "feature_service" in body:
+        if request.feature_service:
             feature_service = store.get_feature_service(
-                body["feature_service"], allow_cache=True
+                request.feature_service, allow_cache=True
             )
             assert_permissions(
                 resource=feature_service, actions=[AuthzedAction.READ_ONLINE]
             )
-            features = feature_service
+            features = feature_service  # type: ignore
         else:
-            features = body["features"]
             all_feature_views, all_on_demand_feature_views = (
                 utils._get_feature_views_to_use(
                     store.registry,
                     store.project,
-                    features,
+                    request.features,
                     allow_cache=True,
                     hide_dummy_entity=False,
                 )
@@ -147,18 +146,19 @@ async def get_online_features(body=Depends(get_body)):
                 assert_permissions(
                     resource=od_feature_view, actions=[AuthzedAction.READ_ONLINE]
                 )
+            features = request.features  # type: ignore
 
         read_params = dict(
             features=features,
-            entity_rows=entity_rows,
-            full_feature_names=full_feature_names,
+            entity_rows=request.entities,
+            full_feature_names=request.full_feature_names,
         )
 
         if store._get_provider().async_supported.online.read:
-            response = await store.get_online_features_async(**read_params)
+            response = await store.get_online_features_async(**read_params)  # type: ignore
         else:
             response = await run_in_threadpool(
-                lambda: store.get_online_features(**read_params)
+                lambda: store.get_online_features(**read_params)  # type: ignore
             )
 
         # Convert the Protobuf object to JSON and return it
@@ -167,8 +167,7 @@ async def get_online_features(body=Depends(get_body)):
         )
 
     @app.post("/push", dependencies=[Depends(inject_user_details)])
-    async def push(body=Depends(get_body)):
-        request = PushFeaturesRequest(**json.loads(body))
+    async def push(request: PushFeaturesRequest) -> None:
         df = pd.DataFrame(request.df)
         actions = []
         if request.to == "offline":
@@ -220,17 +219,16 @@ async def push(body=Depends(get_body)):
             store.push(**push_params)
 
     @app.post("/write-to-online-store", dependencies=[Depends(inject_user_details)])
-    def write_to_online_store(body=Depends(get_body)):
-        request = WriteToFeatureStoreRequest(**json.loads(body))
+    def write_to_online_store(request: WriteToFeatureStoreRequest) -> None:
         df = pd.DataFrame(request.df)
         feature_view_name = request.feature_view_name
         allow_registry_cache = request.allow_registry_cache
         try:
-            feature_view = store.get_stream_feature_view(
+            feature_view = store.get_stream_feature_view(  # type: ignore
                 feature_view_name, allow_registry_cache=allow_registry_cache
             )
         except FeatureViewNotFoundException:
-            feature_view = store.get_feature_view(
+            feature_view = store.get_feature_view(  # type: ignore
                 feature_view_name, allow_registry_cache=allow_registry_cache
             )
 
@@ -250,11 +248,12 @@ async def health():
         )
 
     @app.post("/materialize", dependencies=[Depends(inject_user_details)])
-    def materialize(body=Depends(get_body)):
-        request = MaterializeRequest(**json.loads(body))
-        for feature_view in request.feature_views:
+    def materialize(request: MaterializeRequest) -> None:
+        for feature_view in request.feature_views or []:
+            # TODO: receives a str for resource but isn't in the Union. is str actually allowed?
             assert_permissions(
-                resource=feature_view, actions=[AuthzedAction.WRITE_ONLINE]
+                resource=feature_view,  # type: ignore
+                actions=[AuthzedAction.WRITE_ONLINE],
             )
         store.materialize(
             utils.make_tzaware(parser.parse(request.start_ts)),
@@ -263,11 +262,12 @@ def materialize(body=Depends(get_body)):
         )
 
     @app.post("/materialize-incremental", dependencies=[Depends(inject_user_details)])
-    def materialize_incremental(body=Depends(get_body)):
-        request = MaterializeIncrementalRequest(**json.loads(body))
-        for feature_view in request.feature_views:
+    def materialize_incremental(request: MaterializeIncrementalRequest) -> None:
+        for feature_view in request.feature_views or []:
+            # TODO: receives a str for resource but isn't in the Union. is str actually allowed?
             assert_permissions(
-                resource=feature_view, actions=[AuthzedAction.WRITE_ONLINE]
+                resource=feature_view,  # type: ignore
+                actions=[AuthzedAction.WRITE_ONLINE],
             )
         store.materialize_incremental(
             utils.make_tzaware(parser.parse(request.end_ts)), request.feature_views