What could be causing my Ajax request with dataType set to "jsonp" to encounter errors?

My code includes an Ajax call that looks like this:

var baseurl = Office.context.mailbox.restUrl;
var getMessageUrl = baseurl + "/v2.0/me/messages/" + rest_id + "?$select=SingleValueExtendedProperties&$expand=SingleValueExtendedProperties($filter=PropertyId eq 'String 0x007D')";


$.ajax({
        url: getMessageUrl,
        dataType: "jsonp",
        headers: {
            "Authorization": "Bearer " + rest_token,
            "Accept": "application/json; odata.metadata=none"
        },
        error: function (xhr, ajaxOptions, thrownError) {
            $('.resultsScore').text(xhr.statusText);
        }
    }).done(function (item) {

Despite my efforts, I keep encountering an error as the error function always gets triggered. When I switch to using dataType: "json", everything works smoothly. What could be causing this issue? Why does jsonp not work in this specific scenario?

javascriptjsonajaxjsonp

Answer №1

The issue is likely arising due to the response not being in JSONP format.

There could be a few reasons for this. The API you are accessing may not have support for JSONP. Furthermore, JSONP requests do not allow for custom headers to be set, causing your Authorization header to be omitted.

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