【新人求助】Go 中dep ensure的时候一直报错

dep ensure的时候一直报如下错误， 参考了https://www.jianshu.com/p/6fe61053c8aa?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation 但是依旧没有用，已经下载了 ✗ unable to deduce repository and source type for "golang.org/x/oauth2": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/oauth2?go-get=1": Get http://golang.org/x/oauth2?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ✗ unable to deduce repository and source type for "golang.org/x/sync": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/sync?go-get=1": Get http://golang.org/x/sync?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. ✗ unable to deduce repository and source type for "golang.org/x/net": unable to read metadata: unable to fetch raw metadata: failed HTTP request to URL "http://golang.org/x/net?go-get=1": Get http://golang.org/x/net?go-get=1: dial tcp 216.239.37.1:80: connectex: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond. 请各位大神帮忙指导下，刚刚入Go，因此请各位大神不吝指导指导。。。。。