diff --git a/litellm/proxy/guardrails/guardrail_hooks/aporia_ai/aporia_ai.py b/litellm/proxy/guardrails/guardrail_hooks/aporia_ai/aporia_ai.py
index dafa6e06652..21211da5fa5 100644
--- a/litellm/proxy/guardrails/guardrail_hooks/aporia_ai/aporia_ai.py
+++ b/litellm/proxy/guardrails/guardrail_hooks/aporia_ai/aporia_ai.py
@@ -24,6 +24,7 @@ from litellm.litellm_core_utils.logging_utils import (
     convert_litellm_response_object_to_str,
 )
 from litellm.llms.custom_httpx.http_handler import (
+    AsyncHTTPHandler,
     get_async_httpx_client,
     httpxSpecialProvider,
 )
@@ -44,9 +45,17 @@ class AporiaGuardrail(CustomGuardrail):
             GuardrailEventHooks.post_call,
         ]
 
-    def __init__(self, api_key: str | None = None, api_base: str | None = None, **kwargs):
+    def __init__(
+        self,
+        api_key: str | None = None,
+        api_base: str | None = None,
+        async_handler: AsyncHTTPHandler | None = None,
+        **kwargs,
+    ):
         kwargs.setdefault("supported_event_hooks", list(self.get_supported_event_hooks()))
-        self.async_handler = get_async_httpx_client(llm_provider=httpxSpecialProvider.GuardrailCallback)
+        self.async_handler = async_handler or get_async_httpx_client(
+            llm_provider=httpxSpecialProvider.GuardrailCallback
+        )
         self.aporia_api_key = api_key or os.environ["APORIO_API_KEY"]
         self.aporia_api_base = api_base or os.environ["APORIO_API_BASE"]
         super().__init__(**kwargs)
@@ -129,7 +138,7 @@ class AporiaGuardrail(CustomGuardrail):
             # check if the response was flagged
             _json_response: Final = response.json()
             action: str = _json_response.get("action")  # possible values are modify, passthrough, block, rephrase
-            if action == "block":
+            if action != "passthrough":
                 raise HTTPException(
                     status_code=400,
                     detail={
diff --git a/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_aporia.py b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_aporia.py
new file mode 100644
index 00000000000..86077db7e4e
--- /dev/null
+++ b/tests/test_litellm/proxy/guardrails/guardrail_hooks/test_aporia.py
@@ -0,0 +1,77 @@
+import json
+from unittest.mock import AsyncMock, MagicMock
+
+import pytest
+from fastapi import HTTPException
+
+from litellm.llms.custom_httpx.http_handler import AsyncHTTPHandler
+from litellm.proxy.guardrails.guardrail_hooks.aporia_ai.aporia_ai import AporiaGuardrail
+
+
+def _guardrail(body: dict[str, str | None]) -> tuple[AporiaGuardrail, AsyncMock]:
+    response = MagicMock()
+    response.status_code = 200
+    response.text = json.dumps(body)
+    response.json = MagicMock(return_value=body)
+    post = AsyncMock(return_value=response)
+    handler = MagicMock(spec=AsyncHTTPHandler)
+    handler.post = post
+    guardrail = AporiaGuardrail(
+        guardrail_name="aporia",
+        api_key="k",
+        api_base="https://example.invalid",
+        async_handler=handler,
+    )
+    return guardrail, post
+
+
+async def _validate(guardrail: AporiaGuardrail) -> None:
+    await guardrail.make_aporia_api_request(
+        request_data={},
+        new_messages=[{"role": "user", "content": "hello"}],
+    )
+
+
+@pytest.mark.asyncio
+async def test_passthrough_is_forwarded():
+    guardrail, post = _guardrail({"action": "passthrough"})
+
+    await _validate(guardrail)
+
+    post.assert_awaited_once()
+
+
+@pytest.mark.asyncio
+async def test_block_is_refused():
+    guardrail, _ = _guardrail({"action": "block"})
+
+    with pytest.raises(HTTPException) as exc:
+        await _validate(guardrail)
+
+    assert exc.value.status_code == 400
+    assert "Violated guardrail policy" in str(exc.value.detail)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize("action", ["modify", "rephrase"])
+async def test_an_intervention_is_not_forwarded_unchanged(action: str):
+    guardrail, _ = _guardrail({"action": action})
+
+    with pytest.raises(HTTPException) as exc:
+        await _validate(guardrail)
+
+    assert exc.value.status_code == 400
+    assert action in str(exc.value.detail)
+
+
+@pytest.mark.asyncio
+@pytest.mark.parametrize(
+    "body",
+    [{"action": "BLOCK"}, {"action": "blocked"}, {"action": ""}, {"action": None}, {}],
+    ids=["BLOCK", "blocked", "empty", "null", "missing"],
+)
+async def test_a_verdict_it_cannot_read_is_not_taken_for_permission(body: dict[str, str | None]):
+    guardrail, _ = _guardrail(body)
+
+    with pytest.raises(HTTPException):
+        await _validate(guardrail)