使用go get github.com/gin-gonic/gin时候遇到的，由于一些你懂的原因，找不到google.golang.org/protobuf/proto
unrecognized import path "google.golang.org/protobuf/encoding/prototext": https fetch: Get "https://google.golang.org/protobuf/encoding/prototext?go-get=1": dial tcp 216.239.37.1:443: 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.
unrecognized import path "google.golang.org/protobuf/encoding/protowire": https fetch: Get "https://google.golang.org/protobuf/encoding/protowire?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
mabing@mabingdeMacBook-Pro logger % go get -u github.com/golang/protobuf/proto
unrecognized import path "google.golang.org/protobuf/encoding/prototext": https fetch: Get "https://google.golang.org/protobuf/encoding/prototext?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/encoding/protowire": https fetch: Get "https://google.golang.org/protobuf/encoding/protowire?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/proto": https fetch: Get "https://google.golang.org/protobuf/proto?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/reflect/protoreflect": https fetch: Get "https://google.golang.org/protobuf/reflect/protoreflect?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/reflect/protoregistry": https fetch: Get "https://google.golang.org/protobuf/reflect/protoregistry?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/runtime/protoiface": https fetch: Get "https://google.golang.org/protobuf/runtime/protoiface?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
unrecognized import path "google.golang.org/protobuf/runtime/protoimpl": https fetch: Get "https://google.golang.org/protobuf/runtime/protoimpl?go-get=1": dial tcp 216.239.37.1:443: i/o timeout
解决办法：
项目代码托管在coding上，国内访问应该快一点
地址：https://robinqiwei.coding.net/p/googleprotobuf/git
LINUX上执行下面的命令：
mkdir -p $GOPATH/src/google.golang.org
git clone https://e.coding.net/robinqiwei/googleprotobuf.git $GOPATH/src/google.golang.org/protobuf