我有碼頭集裝箱。有一個服務器（在 Go 上）處理 8000 端口上的發布請求。該代碼：package mainimport (    "database/sql"    _ "github.com/lib/pq"    "fmt"    "net/http"    "encoding/json")type tv_type struct {     brand string `json:"brand"`    manufacturer string `json:"manufacturer"`    model string `json:"model"`    year int16 `json:"year"`} func handler(w http.ResponseWriter, r *http.Request) {        if r.Method == http.MethodGet {           //blahblah        }    fmt.Fprintln(w, "Hello WORLD")       if r.Method == http.MethodPost {        connStr := "user=www password=qwerty dbname=products sslmode=disable"        db, err := sql.Open("postgres", connStr)        defer db.Close()        if err != nil {            panic(err)        }         decoder := json.NewDecoder(r.Body)        var t tv_type        err = decoder.Decode(&t)        if err != nil {            panic(err)        }        _, err = db.Exec("insert into TV (brand, manufacturer, model, year) values ($1, $2, $3, $4)",            t.brand, t.manufacturer, t.model, t.year)        if err != nil {            panic(err)        } else {                        fmt.Println(t.brand, t.manufacturer, t.model, t.year)            fmt.Fprintln(w, "Inserting has been succesfully")        }    }}func main() {    http.HandleFunc("/", handler)    http.ListenAndServe(":8000", nil)}運行 Docker 容器，在 8000 端口的 docker 容器上請求 80 自己的端口代理。運行這個之后：curl -X POST -H "Content-Type:application/json" -d '{"brand":"samsung", "manufacturer":"samsung", "model":"x1", "year":2015 }' http://localhost:80Hello WORLDInserting has been succesfully但是得到的數據是錯誤的（nil，nil，nil，0）：go run /home/go/hello.go    0