golang GET 出现 x509: certificate signed by unknown authority
我们编写一个Go程序来尝试与这个HTTPS server建立连接并通信。//gohttps/4-https/client1.go
package main
import (
"fmt"
"io/ioutil"
"net/http"
)
func main() {
resp, err := http.Get("https://localhost:8081")
if err != nil {
fmt.Println("error:", err)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
fmt.Println(string(body))
}
运行这个client，我们得到如下错误：
$go run client1.go
error: Get https://localhost:8081: x509: certificate signed by unknown authority
此时服务端也给出了错误日志提示：
2015/04/30 16:03:31 http: TLS handshake error from 127.0.0.1:62004: remote error: bad certificate
显然从客户端日志来看，go实现的Client端默认也是要对服务端传过来的数字证书进行校验的，但客户端提示：这个证书是由不知名CA签发 的！
我们可以修改一下client1.go的代码，让client端略过对证书的校验：
//gohttps/4-https/client2.go
package main
import (
"crypto/tls"
"fmt"
"io/ioutil"
"net/http"
)
func main() {
tr := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
client := &http.Client{Transport: tr}
resp, err := client.Get("https://localhost:8081")
if err != nil {
fmt.Println("error:", err)
return
}
defer resp.Body.Close()
body, err := ioutil.ReadAll(resp.Body)
fmt.Println(string(body))
}
通过设置tls.Config的InsecureSkipVerify为true，client将不再对服务端的证书进行校验。执行后的结果 也证实了这一点：
$go run client2.go
Hi, This is an example of http service in golang!
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