The transmission of ContentType is unsuccessful

I'm having an issue with the code in my app. It seems that the content-type is not being sent. Is there a way to force it to be sent?

$.ajax({                                                                   
        crossDomain: true,
        type: 'GET',
        url: 'http://serv/services/rest/contact/' + localStorage.getItem('contact'), 
        callback: 'jsonpCallback',
        jsonpCallback: 'jsonpCallback',
        jsonp: '_jsonp',
        **contentType:  'application/json',**
        dataType: 'jsonp json',
        timeout : 10000,

        success: function(data){
            $("#name").attr("value", data.response.label);
        }           },
        error: function (xhr, ajaxOptions, thrownError){
            alert("Status: " + xhr.status + ", Ajax option: " + ajaxOptions + ", Thrown error: " + thrownError);
        },
    });

This is what my request header looks like:

Accept:*/*
Accept-Charset:ISO-8859-2,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:pl-PL,pl;q=0.8,en-US;q=0.6,en;q=0.4
Connection:keep-alive
Cookie:JSESSIONID=F0ED33279488888888B35A731B40EE0C; oam.Flash.RENDERMAP.TOKEN=789456321
Host:serv
User-Agent:Mozilla/5.0 (Windows NT 6.0) AppleWebKit/537.1 (KHTML, like Gecko)                   Chrome/21.0.1180.83 Safari/537.1

It's clear that the contentType is missing. Any ideas on what could be causing this?

Thank you for your assistance.

javascriptajaxjsoncordovajquery-mobile

Answer №1

If you want to specify the Content-Type, make sure you are POSTing data. In that case, you should modify this line:

type: 'POST'

If you're trying to indicate what kind of response you expect from the server, consider using:

accepts: 'application/json'

For additional details, refer to jQuery Ajax API documentation

Answer №2

There is no need for a content type in requests.

To retrieve data in JSON format, update your dataType to json as shown below:

$.ajax({
    type: "GET",
    url: 'http://serv/services/rest/contact/' + localStorage.getItem('contact'), 
    dataType: "json",
    success: function(data){
        $("#name").attr("value", data.response.label);
    },
    error: function (xhr, ajaxOptions, thrownError){
        alert("Status: " + xhr.status + ", Ajax option: " + ajaxOptions + ", Thrown error: " + thrownError);
    }
});

Ensure that your data is returned as JSON.

I noticed you have crossDomain: true,. To enable this feature, refer to Cross-Origin Resource Sharing and include the header 

Access-Control-Allow-Origin: http://www.example.com
in your response.

For PHP implementations:

header('Access-Control-Allow-Origin: http://www.example.com');

For .htaccess:

<IfModule mod_headers.c>
    Header set Access-Control-Allow-Origin "http://www.example.com"
</IfModule>

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