[go-nuts] help(rest call failed)

[alive . seek]

I just want to send a rest call with golang, but it failed, the error 
message :  {"header":{"code":201,"desc":"param data not exist"}} .    (but 
when I send rest request with postman ,it success)
the code as follow

1 package main
  2 
  3 import(
  4         "net/http"
  5         "fmt"
  6         "strings"
  7         "io/ioutil"
  8 )
  9 func check(err error){
 10         if err !=nil{
 11                 panic(err)
 12         }
 13 }
 14 func main(){
 15         url:="http://ip:8080/api";
 16         method:="POST"
 17         da:="base64 encoded string"
 18         data:=strings.NewReader(da)
 19         req,err:=http.NewRequest(method,url,data)
 20         check(err)
 21        
 req.Header.Set("Content_Type","application/x-www-form-urlencoded")
 22         client:=&http.Client{}
 23         resp,err:=client.Do(req)
 24         check(err)
 25         defer resp.Body.Close()
 26         result,err:=ioutil.ReadAll(resp.Body)
 27         check(err)
 28         fmt.Println(string(result[:]))
 29 }

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