langchain/utilities/serpapi.py/SerpAPIWrapper/construct_url_and_params
class SerpAPIWrapper:    async def aresults(self, query: str) -> dict:
        """Use aiohttp to run query through SerpAPI and return the results async."""

        def construct_url_and_params() -> Tuple[str, Dict[str, str]]:
            params = self.get_params(query)
            params["source"] = "python"
            if self.serpapi_api_key:
                params["serp_api_key"] = self.serpapi_api_key
            params["output"] = "json"
            url = "https://serpapi.com/search"
            return url, params

        url, params = construct_url_and_params()
        if not self.aiosession:
            async with aiohttp.ClientSession() as session:
                async with session.get(url, params=params) as response:
                    res = await response.json()
        else:
            async with self.aiosession.get(url, params=params) as response:
                res = await response.json()

        return res