我可以通过curl执行以下命令成功创建一个地方：

$ curl -vX POST https://server/api/v1/places.json -d "
  auth_token=B8dsbz4HExMskqUa6Qhn& \
  place[name]=Fuelstation Central& \
  place[city]=Grossbeeren& \
  place[address]=Buschweg 1& \
  place[latitude]=52.3601& \
  place[longitude]=13.3332& \
  place[washing]=true& \
  place[founded_at_year]=2000& \
  place[products][]=diesel& \
  place[products][]=benzin \
"

服务器返回HTTP/1.1 201 Created。
现在，我想将有效负载存储在一个如下所示的JSON文件中：

// testplace.json
{
  "auth_token" : "B8dsbz4HExMskqUa6Qhn",
  "name" : "Fuelstation Central",
  "city" : "Grossbeeren",
  "address" : "Buschweg 1",
  "latitude" : 52.3601,
  "longitude" : 13.3332,
  "washing" : true,
  "founded_at_year" : 2000,
  "products" : ["diesel","benzin"]
}

所以我修改了要执行的命令，如下所示：

$ curl -vX POST http://server/api/v1/places.json -d @testplace.json

返回失败HTTP/1.1 401 Unauthorized。为什么？