Parse error on Google GeoLocate API sample JSON - json

Question

Has Google changed their GeoLocation api and not updated the documentation?
I have been following their example code verbatim off of the following page
https://developers.google.com/maps/documentation/geolocation/intro
I pasted the sample request into a file on my system called ex.json. I double checked that my Google Maps Geolocation API is set to on and executed the following curl command
curl -d ex.json -H "Content-Type: application/json" -i "https://www.googleapis.com/geolocation/v1/geolocate?key=[My key, yes I pasted my actual key in]"
I received the following response
{
"error": {
"errors": [
{
"domain": "global",
"reason": "parseError",
"message": "Parse Error"
}
],
"code": 400,
"message": "Parse Error"
}
}
Which according to the documentation means that there is something wrong with the example json they provided. Just for completeness the sample json looks like
{
"homeMobileCountryCode": 310,
"homeMobileNetworkCode": 260,
"radioType": "gsm",
"carrier": "T-Mobile",
"cellTowers": [
{
"cellId": 39627456,
"locationAreaCode": 40495,
"mobileCountryCode": 310,
"mobileNetworkCode": 260,
"age": 0,
"signalStrength": -95
}
],
"wifiAccessPoints": [
{
"macAddress": "01:23:45:67:89:AB",
"signalStrength": 8,
"age": 0,
"signalToNoiseRatio": -65,
"channel": 8
},
{
"macAddress": "01:23:45:67:89:AC",
"signalStrength": 4,
"age": 0
}
]
}
JsonLint verified that it is proper Json, and the documentation says that all fields are optional. What am I missing, was some required field added after the documentation was written?

Answer 1

Curl needs "-X POST" as extra parameter. Works like this:
curl 'https://www.googleapis.com/geolocation/v1/geolocate?key=YOURKEY' -X POST -H "Content-Type: application/json" -d #yourjsonfile.json

Answer 2

Found the solution, it was a silly mistake :-
my file name was "sampledata.json" i changed this to "#sampledata.json"
I tried with three different curl commands. I got response.