Accessing API with $http POST Content-Type application/x-www-form-urlencoded

问题

I am trying to access this REST API, which accepts three parameters: stationId, crusherId, monthYear I am doing it like this in AngularJS as:

$http({
        //headers: {'Content-Type':'application/x-www-form-urlencoded; charset=UTF-8'},
        //headers: {'Content-Type': 'application/json; charset=UTF-8'},
        headers: {
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8', 
            'Accept':       'application/json'
        },
        url:    'https://myurl../api/getHPData',
        method: 'POST',
        data: {
            stationId: 263, 
            crusherId: 27, 
            monthYear: '2016-4'
        }
    })

    .then(function(data, status, headers, config) {
            //console.log(JSON.stringify(response));
            console.log(data);
     })
    .catch(function(error){
            //console.log("Error: " + JSON.stringify(error));
            console.log(error);
        })

But I am always getting this:

Object {data: "{"result":"false"}", status: 200, config: Object, statusText: "OK", headers: function}

OR

{"data":"{\"result\":\"false\"}","status":200,"config":{"method":"POST","transformRequest":[null],"transformResponse":[null],"headers":{"Content-Type":"application/x-www-form-urlencoded; charset=UTF-8","Accept":"application/json"},"url":"https://myurl../api/getHPData","data":{"stationId":263,"crusherId":27,"monthYear":"2016-4"}},"statusText":"OK"}

If I change header Content-Type to:

headers: {'Content-Type': 'application/json; charset=UTF-8'},

It gives:

Object {data: null, status: -1, config: Object, statusText: "",headers: function}

OR

{"data":null,"status":-1,"config":{"method":"POST","transformRequest":[null],"transformResponse":[null],"headers":{"Content-Type":"application/json; charset=UTF-8","Accept":"application/json, text/plain, /"},"url":"https://myurl../api/getHPData","data":{"stationId":263,"crusherId":27,"monthYear":"2016-4"}},"statusText":""}

What I am doing wrong, Please help me.

Plunker is here:

https://plnkr.co/edit/57SiCdBZB2OkhdR03VOs?p=preview

(Edit)

Note: I can do it in jQuery as:

<script>
$(document).ready(function() {
        get_homepage_data(263, 27, '2016-04');

        function get_homepage_data(stationIds, crusherIds, date) {
            var url = "https://myurl../api/getHPData";
            var data_to_send = {
                'stationId': stationIds, 
                'crusherId': crusherIds,
                'monthYear': date
            };

            console.log("Value is: " + JSON.stringify(data_to_send));
            //change sender name with account holder name
            //        console.log(data_to_send)
            $.ajax({
                url: url,
                method:   'post',
                dataType: 'json',
                //contentType: 'application/json',
                data: data_to_send,
                processData: true,
                // crossDomain: true,
                beforeSend: function () {
                }
                , complete: function () {}
                , success: function (result1) {
                    var Result = JSON.parse(result1);
                    var value_data = Result["valueResult"];
                    var foo = value_data["gyydt"];

                    console.log("Log of foo is: " + foo);

                    var foo2 = 0;
                    // 10 lac is one million.
                    foo2 = foo / 1000000 + ' million';

                    console.log(JSON.stringify(value_data["gyydt"]) + " in million is: " + foo2);
                }
                , error: function (request, error) {
                    return false;
                }
            });
        }   
    }); // eof Document. Ready  
</script>

Output of above script is script is:

• Value is: {"stationId":263,"crusherId":27,"monthYear":"2016-04"}
• XHR finished loading: POST "https://myurl../api/getHPData".
• Log of foo is: 26862094
• "26862094" in million is: 26.862094 million

Which is perfect. :)

回答1:

When posting form data that is URL encoded, transform the request with the $httpParamSerializer service:

$http({
    headers: {'Content-Type':'application/x-www-form-urlencoded; charset=UTF-8'},
    url: 'https://fnrc.gov.ae/roayaservices/api/getHPData',
    method: 'POST',
    transformRequest: $httpParamSerializer,
    transformResponse: function (x) {
      return angular.fromJson(angular.fromJson(x));
    },
    data: {
      "stationId": 263,
      "crusherId": 27,
      "monthYear": '2016-04'
    }
}) 
  .then(function(response) {
    console.log(response);
    $scope.res = response.data;
    console.log($scope.res);
});

Normally the $http service automatically parses the results from a JSON encoded object but this API is returning a string that has been doubly serialized from an object. The transformResponse function fixes that problem.

The DEMO on PLNKR

回答2:

The documentation says that the stationId and crusherId parameters should be arrays of strings. Also, it looks like you are sending JSON data, so make sure to set that header correctly.

$http({
    headers: {
        'Content-Type': 'application/json', 
        'Accept':       'application/json'
    },
    url:    'https://fnrc.gov.ae/roayaservices/api/getHPData',
    method: 'POST',
    data: {
        stationId: ['263'], 
        crusherId: ['27'], 
        monthYear: '2016-4'
    }
})

When I change the code in your plunkr to use the corrected code above, I get the following response: "The requested resource does not support http method 'OPTIONS'."

As the other (now deleted) answer correctly mentioned, this means that there is a CORS issue. The browser is trying to send a "preflight" request before making the cross-origin request, and the server doesn't know what to do with it. You can also see this message in the Chrome console:

XMLHttpRequest cannot load https://fnrc.gov.ae/roayaservices/api/getHPData. Response for preflight has invalid HTTP status code 405

来源：https://stackoverflow.com/questions/43611892/accessing-api-with-http-post-content-type-application-x-www-form-urlencoded