wget ERROR 404:not Found.

[Root@chenqiang-master-dev001-shgq Downloads] #wget Http://mirror.bit.edu.cn/apa che/zookeeper/zookeeper-3.4.3/ zookeeper-3.4.3.tar.gz
–2015-09-29 16:28:05–http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.3/ zookeeper-3.4.3.tar.gz
Resolving mirror.bit.edu.cn ... 219.143.204.117, 2001:da8:204:2001:250:56ff:fea1:22
Connecting to mirror.bit.edu.cn|219.143.204.117|:80 ... Connected.
HTTP request sent, awaiting response ... 404 Not Found
2015-09-29 16:28:06 ERROR 404:not Found.

[Root@chenqiang-master-dev001-shgq downloads]# wget Http://mirror.bit.edu.cn/apa che/zookeeper/zookeeper-3.4.6/ Zookeeper-3.4.6.tar.gz
–2015-09-29 16:34:20–http://mirror.bit.edu.cn/apache/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz
Resolving mirror.bit.edu.cn ... 219.143.204.117, 2001:da8:204:2001:250:56ff:fea1:22
Connecting to mirror.bit.edu.cn|219.143.204.117|:80 ... connected.
HTTP request sent, awaiting response ... OK
length:17699306 (17M) [Application/octet-stream]
Saving to: "Zookeeper-3.4.6.tar.gz"

100%[======================================>] 17,699,306 2.06m/s in 7.9s

2015-09-29 16:34:31 (2.13 MB/s)-"zookeeper-3.4.6.tar.gz" saved [17699306/17699 306]

Summarize:
Generally appears the error 404:not Found. Such a problem, we need to manually open in the browser, to see if we can access, if not accessible, just we can return to the download address of the upper layer or two-tier directory, so that may be accessible. When we are sure we can access it, we can download it directly with wget.