Go 1.7 的一个小问题

当用方法 Post请求一个URL，返回状态码为 303, Location 为 http://www.qiniu.com,Golang HTTP 客户端会自动 Get http://www.qiniu.com 而当这个请求返回状态码 301,Location 为 https 的网站时，如 https://www.qiniu.com 时，Golang 1.7 不会再 Get 这个 Location, 但 Golang 1.8 的 HTTP 客户端会继续 Get 这个Location.

以下是我向Go 提交的issue，但Go 维护者认为 Go 1.8 已经修复了这个问题，不再继续维护 Go 1.7，就把我这个 issue 关掉了。这个倒挺出乎我的意料之外的。我以为 Go 维护者们会继续维护旧的版本。issue 链接

What version of Go are you using (go version)?

go version go1.7.6 darwin/amd64 go version go1.6.4 darwin/amd64

What operating system and processor architecture are you using (go env)?

GOARCH=”amd64” GOBIN=”” GOEXE=”” GOHOSTARCH=”amd64” GOHOSTOS=”darwin” GOOS=”darwin” GOPATH=”/Users/zhuqiuzhi/work” GORACE=”” GOROOT=”/Users/zhuqiuzhi/.gvm/gos/go1.7.6” GOTOOLDIR=”/Users/zhuqiuzhi/.gvm/gos/go1.7.6/pkg/tool/darwin_amd64” CC=”clang” GOGCCFLAGS=”-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/dc/q_v8vj2957s1k0krncnl26q40000gn/T/go-build403359302=/tmp/go-build -gno-record-gcc-switches -fno-common” CXX=”clang++” CGO_ENABLED=”1”

GOARCH=”amd64” GOBIN=”” GOEXE=”” GOHOSTARCH=”amd64” GOHOSTOS=”darwin” GOOS=”darwin” GOPATH=”/Users/zhuqiuzhi/work” GORACE=”” GOROOT=”/Users/zhuqiuzhi/.gvm/gos/go1.6.4” GOTOOLDIR=”/Users/zhuqiuzhi/.gvm/gos/go1.6.4/pkg/tool/darwin_amd64” GO15VENDOREXPERIMENT=”1” CC=”clang” GOGCCFLAGS=”-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fno-common” CXX=”clang++” CGO_ENABLED=”1”

What did you do?

package main

import (
	"net/http"
	"net/http/httptest"
	"fmt"
)

func main() {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("Location", "http://www.qiniu.com/")
		w.WriteHeader(http.StatusSeeOther)
	}))
	defer ts.Close()

	resp, err := http.Post(ts.URL,"multipart/form-data", nil)
	if err != nil {
		fmt.Printf("Post fail, ", err)
	}
	fmt.Println(resp.StatusCode)
	if resp.StatusCode != http.StatusOK {
		fmt.Printf("%v\n", resp.Header)
		fmt.Printf("Fail follow 301, https\n")
	} else {
		fmt.Println("OK")
	}
}

What did you expect to see?

200
OK

What did you see instead?

301
map[Connection:[keep-alive] Date:[Sun, 13 Aug 2017 12:33:51 GMT] X-Swift-Savetime:[Sun, 13 Aug 2017 12:33:51 GMT] Timing-Allow-Origin:[*] Eagleid:[7529f0cc15026276318052012e] Server:[Tengine] Content-Type:[text/html] Content-Length:[178] Location:[https://www.qiniu.com/] Via:[cache17.l2em21-1[31,301-0,M], cache8.l2em21-1[32,0], cache2.cn26[46,301-0,M], cache4.cn26[47,0]] X-Cache:[MISS TCP_MISS dirn:-2:-2] X-Swift-Cachetime:[0]]
Fail follow 301, https