diff --git a/src/monitor_utils/sessions.py b/src/monitor_utils/sessions.py
index b726fad..a0b0e7b 100644
--- a/src/monitor_utils/sessions.py
+++ b/src/monitor_utils/sessions.py
@@ -15,16 +15,26 @@ from aioweb_tls import CurlCffi, TLSSession
 from monitor_utils.constants import CLIENT_IDENTIFIERS, RETRY_LIMIT
 
 
-def get_default_session(proxies: AioProxies) -> TLSSession:
+def get_default_session(
+    proxies: AioProxies, headers: dict | None = None
+) -> TLSSession:
     """Return a TLSSession impersonating a random client fingerprint.
 
     Fingerprint rotation lives here so every monitor rotates the same way; the
     caller owns the session lifetime via ``async with``.
 
+    Cookies are not set here: aioweb has no constructor cookie path, and
+    monitors usually obtain them at runtime, so call session.set_cookie(name,
+    value, domain=...) where they are fetched (e.g. a pre_task_func) instead.
+
     Args:
         proxies: Pool attached to the session as proxy_pool, which send_request
             rotates through per request. Required so a session can never send
             un-proxied.
+        headers: Default headers merged into every request by aioweb. Use for
+            monitor-wide static headers; per-request headers still go through
+            send_request. The curl_cffi impersonation already supplies a
+            matching User-Agent, so one is not defaulted here.
 
     Returns:
         A TLSSession over a curl_cffi backend with a random impersonation, with
@@ -32,7 +42,7 @@ def get_default_session(proxies: AioProxies) -> TLSSession:
     """
 
     impersonate = random.choice(CLIENT_IDENTIFIERS)
-    session = TLSSession(backend=CurlCffi(impersonate=impersonate))
+    session = TLSSession(backend=CurlCffi(impersonate=impersonate), headers=headers)
     session.proxy_pool = proxies
     return session