refactor: add headers module

gallery/sketch/source.py

@@ -10,25 +10,20 @@ logger = logging.getLogger("source")
 RequestMode = Literal["base", "browser"]
 
 DEFAULT_REQUEST_MODE: RequestMode = "base"
-DEFAULT_METHOD = "GET"
+DEFAULT_METHOD: str = "GET"
 
 
 class ApiSource:
-    DEFAULT_USER_AGENT = (
-        "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36"
-    )
     DEFAULT_TIMEOUT = 30.0
 
     def __init__(
         self,
         base_url,
-        user_agent: str = DEFAULT_USER_AGENT,
         timeout: float = DEFAULT_TIMEOUT,
         cookies: dict[str, str] | None = None,
         headers: dict[str, str] | None = None,
     ):
         self._base_url = base_url
-        self._user_agent = user_agent
         self._timeout = timeout
         self._cookies = cookies
         self._headers = headers
@@ -39,9 +34,8 @@ class ApiSource:
         method: str = DEFAULT_METHOD,
         data: Any | None = None,
     ) -> str:
-        headers = {"User-Agent": self._user_agent, **(self._headers or {})}
         async with aiohttp.ClientSession(
-            headers=headers,
+            headers=self._headers,
             cookies=self._cookies,
             raise_for_status=True,
         ) as session: