My Ajax POST is coming up as an error even though I am returning 200

问题

I am making an AJAX post to a Jersey Resource. I build an image and return it. The issue is, no matter what status I return, Ajax thinks it is an error. I can actually use the error message (via error.responseTest) and it works fine. But it is ugly. What do I return to make it a success? I have returned OK(200), Accepted(202) and Created(201). All of them give me an error message but in my Console Network tab, I get a success (green with the proper status).

I am returning it like this:

    return Response.status(Response.Status.ACCEPTED).entity(image).header('Content-Type',"image/png").build();

My JS code:

$.ajax( Monocle.config.Sightline.jobUrl + "/sightline", {
        type: "POST",
        processData: false,
        data: JSON.stringify({
            Lat1: Monocle.Sightline.BBOX(feature,2),
            Long1: Monocle.Sightline.BBOX(feature,1),
            Lat2: Monocle.Sightline.BBOX(feature,4),
            Long2: Monocle.Sightline.BBOX(feature,3),
            OrgLat:observerCoords[0].lat,
            OrgLong:observerCoords[0].lon,
            ObHeight: feature.attributes.observerHeight,
            TargHeight: feature.attributes.targetHeight,
            OuterRadius: feature.attributes.outerRadius,
            LVA: feature.attributes.lowerVertAngle,
            UVA: feature.attributes.upperVertAngle,
            sAzimuth: feature.attributes.startAzimuth,
            eAzimuth: feature.attributes.endAzimuth,
            outputType: "MAX"
        }),
        contentType: "application/json",
        dataType: "json",
        success: function( results ){
            var graphic = new OpenLayers.Layer.Image(
                Monocle.currentWidget.name + " Destination " + featurenum,
                "data:image/png;base64," + results,
                new OpenLayers.Bounds(Monocle.Sightline.BBOX(feature,1), Monocle.Sightline.BBOX(feature,2), Monocle.Sightline.BBOX(feature,3),Monocle.Sightline.BBOX(feature,4)),
                new OpenLayers.Size(580, 288),
                { isBaseLayer: false,
                    opacity: 0.3,
                    displayOutsideMaxExtent: true
                });
            feature.legionObject = graphic;
            graphic.relatedlayer = Monocle.currentWidget.name + " Destination " + featurenum;

            Monocle.Map.map.addLayer(graphic);
        },
        error: function(errMsg) {
            // TODO: really handle any errors

        }
    });

回答1:

Setting dataType: "json", means that your response is to be json which it isn't that would cause the error so just remove it.
Also is your image data has to be base64 encoded to make a data uri.

来源：https://stackoverflow.com/questions/16112628/my-ajax-post-is-coming-up-as-an-error-even-though-i-am-returning-200

标签

ajax

jersey