Golang HTTP XML解析问题

I'm trying to access an XML file available online, but after the GET the XML format disappears.
What am I doing wrong?
Thank you so much!

func getHttp(address string) string{
    resp, err := http.Get(address)
    resp.Header.Add("Content-Type","application/xml; charset=utf-8")
    if err != nil {
        panic(err)
    }

    defer resp.Body.Close()

    data, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        panic(err)
    }

    return (string(data))
}

The new format looks like this:

{"SessionKey":"229eaeaa9fb14a0d85ff38ae4e0c7870_ecilpojl_018FC93424D13ECC0908CE5BC5E3F86B","Query":{"Country":"GB","Currency":"GBP","Locale":"en-gb","Adults":1,"Children":0,"Infants":0,"OutboundDate":"2016-10-08","LocationSchema":"Default","CabinClass":"Economy","GroupPricing":false},

instead of

<SessionKey>229eaeaa9fb14a0d85ff38ae4e0c7870_ecilpojl_018FC93424D13ECC0908CE5BC5E3F86B</SessionKey>
  <Query>
    <Country>GB</Country>
    <Currency>GBP</Currency>
    <Locale>en-gb</Locale>
    <Adults>1</Adults>
    <Children>0</Children>
    <Infants>0</Infants>
    <OutboundDate>2016-10-08</OutboundDate>
    <LocationSchema>Default</LocationSchema>
    <CabinClass>Economy</CabinClass>
    <GroupPricing>false</GroupPricing>
  </Query>