参数
待补充
返回值
| code | means |
| 0 | No problems occurred |
| 1 | Generic error code |
| 2 | Parse error — for instance, when parsing command-line options, the .wgetrc or .netrc… |
| 3 | File I/O error |
| 4 | Network failure |
| 5 | SSL verification failure |
| 6 | Username/password authentication failure |
| 7 | Protocol errors |
| 8 | Server issued an error response |