diff --git a/backend-services/tests/test_soap_gateway_content_types.py b/backend-services/tests/test_soap_gateway_content_types.py
new file mode 100644
index 0000000..0b256c5
--- /dev/null
+++ b/backend-services/tests/test_soap_gateway_content_types.py
@@ -0,0 +1,142 @@
+import pytest
+
+
+class _FakeXMLResponse:
+    def __init__(self, status_code=200, text='<ok/>', headers=None):
+        self.status_code = status_code
+        self.text = text
+        base = {'Content-Type': 'text/xml'}
+        if headers:
+            base.update(headers)
+        self.headers = base
+        self.content = self.text.encode('utf-8')
+
+
+def _mk_xml_client(captured):
+    class _FakeXMLClient:
+        def __init__(self, *args, **kwargs):
+            pass
+        async def __aenter__(self):
+            return self
+        async def __aexit__(self, exc_type, exc, tb):
+            return False
+        async def post(self, url, content=None, params=None, headers=None):
+            captured.append({'url': url, 'headers': dict(headers or {}), 'content': content})
+            return _FakeXMLResponse(200, '<ok/>', {'X-Upstream': 'yes', 'Content-Type': 'text/xml'})
+    return _FakeXMLClient
+
+
+async def _setup_api(client, name, ver):
+    r = await client.post('/platform/api', json={
+        'api_name': name,
+        'api_version': ver,
+        'api_description': f'{name} {ver}',
+        'api_allowed_roles': ['admin'],
+        'api_allowed_groups': ['ALL'],
+        'api_servers': ['http://soap.up'],
+        'api_type': 'REST',
+        'api_allowed_retry_count': 0,
+    })
+    assert r.status_code in (200, 201)
+    r2 = await client.post('/platform/endpoint', json={
+        'api_name': name,
+        'api_version': ver,
+        'endpoint_method': 'POST',
+        'endpoint_uri': '/call',
+        'endpoint_description': 'soap call',
+    })
+    assert r2.status_code in (200, 201)
+    rme = await client.get('/platform/user/me')
+    username = (rme.json().get('username') if rme.status_code == 200 else 'admin')
+    rs = await client.post('/platform/subscription/subscribe', json={'username': username, 'api_name': name, 'api_version': ver})
+    assert rs.status_code in (200, 201)
+
+
+@pytest.mark.asyncio
+async def test_soap_incoming_application_xml_sets_text_xml_outgoing(monkeypatch, authed_client):
+    import services.gateway_service as gs
+    name, ver = 'soapct1', 'v1'
+    await _setup_api(authed_client, name, ver)
+    captured = []
+    monkeypatch.setattr(gs.httpx, 'AsyncClient', _mk_xml_client(captured))
+    envelope = '<Envelope/>'
+    r = await authed_client.post(
+        f'/api/soap/{name}/{ver}/call',
+        headers={'Content-Type': 'application/xml'},
+        content=envelope,
+    )
+    assert r.status_code == 200
+    assert len(captured) == 1
+    h = captured[0]['headers']
+    assert h.get('Content-Type') == 'text/xml; charset=utf-8'
+
+
+@pytest.mark.asyncio
+async def test_soap_incoming_text_xml_passes_through(monkeypatch, authed_client):
+    import services.gateway_service as gs
+    name, ver = 'soapct2', 'v1'
+    await _setup_api(authed_client, name, ver)
+    captured = []
+    monkeypatch.setattr(gs.httpx, 'AsyncClient', _mk_xml_client(captured))
+    envelope = '<Envelope/>'
+    r = await authed_client.post(
+        f'/api/soap/{name}/{ver}/call',
+        headers={'Content-Type': 'text/xml'},
+        content=envelope,
+    )
+    assert r.status_code == 200
+    h = captured[0]['headers']
+    assert h.get('Content-Type') == 'text/xml'
+
+
+@pytest.mark.asyncio
+async def test_soap_incoming_application_soap_xml_passes_through(monkeypatch, authed_client):
+    import services.gateway_service as gs
+    name, ver = 'soapct3', 'v1'
+    await _setup_api(authed_client, name, ver)
+    captured = []
+    monkeypatch.setattr(gs.httpx, 'AsyncClient', _mk_xml_client(captured))
+    envelope = '<Envelope/>'
+    r = await authed_client.post(
+        f'/api/soap/{name}/{ver}/call',
+        headers={'Content-Type': 'application/soap+xml'},
+        content=envelope,
+    )
+    assert r.status_code == 200
+    h = captured[0]['headers']
+    assert h.get('Content-Type') == 'application/soap+xml'
+
+
+@pytest.mark.asyncio
+async def test_soap_adds_default_soapaction_when_missing(monkeypatch, authed_client):
+    import services.gateway_service as gs
+    name, ver = 'soapct4', 'v1'
+    await _setup_api(authed_client, name, ver)
+    captured = []
+    monkeypatch.setattr(gs.httpx, 'AsyncClient', _mk_xml_client(captured))
+    envelope = '<Envelope/>'
+    r = await authed_client.post(
+        f'/api/soap/{name}/{ver}/call',
+        headers={'Content-Type': 'application/xml'},
+        content=envelope,
+    )
+    assert r.status_code == 200
+    h = captured[0]['headers']
+    assert 'SOAPAction' in h and h['SOAPAction'] == '""'
+
+
+@pytest.mark.asyncio
+async def test_soap_parses_xml_response_success(monkeypatch, authed_client):
+    import services.gateway_service as gs
+    name, ver = 'soapct5', 'v1'
+    await _setup_api(authed_client, name, ver)
+    captured = []
+    monkeypatch.setattr(gs.httpx, 'AsyncClient', _mk_xml_client(captured))
+    envelope = '<Envelope/>'
+    r = await authed_client.post(
+        f'/api/soap/{name}/{ver}/call',
+        headers={'Content-Type': 'application/xml'},
+        content=envelope,
+    )
+    assert r.status_code == 200
+    assert '<ok/>' in (r.text or '')