- get_headers(url): Referer, Sec-Fetch-*, sec-ch-ua, API vs HTML Accept - httpx AsyncClient/ sync Client with optional HTTP/2 (h2 extra) - On 403/429/503/520-523/525/567 or request errors, retry via curl_cffi chrome124 impersonate - POST: Origin, Referer, Content-Type for form posts - kuaidaili/ip3366: forward get_headers(url=...) Made-with: Cursor