使用Node.js,我们可以检查布尔值以查看响应是否已写入:
app.use((req,res,next) => {
if(res.finished){
return;
}
next()
});
使用Golang是否可以检查响应是否“完成”?我在http.ResponseWriter上没有看到这样的属性:
所以也许是http.Response.Close?
我在路由器/中间件上进行了实验,这是结果(有用的信息在最后):
func check0() {
return
}
func check01() int {
return 200
}
func check02() (int, string) {
return 200, "boop"
}
func check03() bool {
return true
}
func check04() string {
return "04"
}
func check1(res http.ResponseWriter) string {
return "1"
}
func check2(c martini.Context, res http.ResponseWriter) string {
if true {
return "hiii"
}
c.Next()
return "2"
}
func check3(c martini.Context, res http.ResponseWriter) string {
c.Next()
return "3"
}
func check4(res http.ResponseWriter) {
res.Write([]byte("4"))
}
func check5(c martini.Context, res http.ResponseWriter) (int, string, string) {
res.Write([]byte("5.0"))
c.Next()
return 200, "5.1x", "5.1y"
}
func finish(res http.ResponseWriter) {
fmt.Println("in finish")
res.Write([]byte("all done"))
}
func Routes(m *martini.ClassicMartini) {
m.Get("/cp/meta/test/middleware0", check0, finish)
m.Get("/cp/meta/test/middleware01", check01, finish)
m.Get("/cp/meta/test/middleware02", check02, finish)
m.Get("/cp/meta/test/middleware03", check03, finish)
m.Get("/cp/meta/test/middleware04", check04, finish)
m.Get("/cp/meta/test/middleware1", check1, finish)
m.Get("/cp/meta/test/middleware2", check2, finish)
m.Get("/cp/meta/test/middleware3", check3, finish)
m.Get("/cp/meta/test/middleware4", check4, finish)
m.Get("/cp/meta/test/middleware5", check5, finish)
m.Get("/cp/meta/echo_runtime_config", common.AsJson, common.RequestTimer, mw.BodyToMap, ctr.GetRuntimeConfig)
}
这是我按下api时的结果:
GET /cp/meta/test/middleware0 => 'all done'
GET /cp/meta/test/middleware01 => ''
GET /cp/meta/test/middleware03 => '<bool Value>'
GET /cp/meta/test/middleware02 => 'boop'
GET /cp/meta/test/middleware1 => '1'
GET /cp/meta/test/middleware04 => '04'
GET /cp/meta/test/middleware2 => 'hiii'
GET /cp/meta/test/middleware3 => 'all done3'
GET /cp/meta/test/middleware4 => '4'
GET /cp/meta/test/middleware5 => '5.0all done5.1x'
所以这是规则: