()
| 51 | |
| 52 | |
| 53 | def _resolve_proxy() -> Optional[str]: |
| 54 | for var in ("HTTPS_PROXY", "https_proxy", "HTTP_PROXY", "http_proxy"): |
| 55 | v = os.environ.get(var) |
| 56 | if v: |
| 57 | return v |
| 58 | return None |
| 59 | |
| 60 | |
| 61 | # --------------------------------------------------------------------------- |