问如何将XML POST数据从iOS应用程序发送到Django应用程序？

EN

- (void) submitHighScore {
    NSLog(@"Submitting high score...");

    NSString *urlString = HIGH_SCORES_URL;
    NSURL *url = [NSURL URLWithString: urlString];

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL: url];
    [request setHTTPMethod: @"POST"];
    [request setValue: @"text/xml" forHTTPHeaderField: @"Content-Type"];

    NSMutableData *highScoreData = [NSMutableData data];
    [highScoreData appendData: [[NSString stringWithFormat: @"<?xml version=\"1.0\" encoding=\"UTF-8\" ?>"] dataUsingEncoding: NSUTF8StringEncoding]];
    [highScoreData appendData: [[NSString stringWithFormat: @"<player_name>%@</player_name", @"test"] dataUsingEncoding: NSUTF8StringEncoding]];
    [highScoreData appendData: [[NSString stringWithFormat: @"<score>%d</score>", 0] dataUsingEncoding: NSUTF8StringEncoding]];
    [highScoreData appendData: [[NSString stringWithFormat: @"</xml>"] dataUsingEncoding: NSUTF8StringEncoding]];
    [request setHTTPBody: highScoreData];

    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: YES];

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest: request 
                                                                  delegate: self];
    if (!connection) {
        NSLog(@"Request to send high scores appears to be invalid.");
        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible: NO];
    }
}

from django.http import HttpResponse, HttpResponseBadRequest
from django.shortcuts import render_to_response
from django.template import RequestContext
from django.core import serializers
from django.core.exceptions import ValidationError
from django.views.decorators.csrf import csrf_exempt

from modologger.taptap.models import HighScore

@csrf_exempt
def leaderboard( request, xml = False, template_name = 'apps/taptap/leaderboard.html' ):
    """Returns leaderboard."""
    if xml == True: # xml is set as True or False in the URLConf, based on the URL requested
        if request.method == 'POST':
            postdata = request.POST.copy()
            print postdata
                # here, postdata is evaluated as: 
                # <QueryDict: {u'<?xml version': [u'"1.0" encoding="UTF-8" ?><player_name>test</player_name<score>0</score></xml>']}>
            for deserialized_object in serializers.deserialize('xml', postdata):    # this fails, returning a 500 error
                try:
                    deserialized_object.object.full_clean()
                except ValidationError, e:
                    return HttpResponseBadRequest
                deserialized_object.save()
        else:   
            high_score_data = serializers.serialize( 'xml', HighScore.objects.all() )
            return HttpResponse( high_score_data, mimetype = 'text/xml' )
    else:
        high_scores = HighScore.objects.all()
        return render_to_response( template_name, locals(), context_instance = RequestContext( request ) )

NSMutableData *highScoreData = [NSMutableData data];
[highScoreData appendData: [[NSString stringWithFormat: @"player_name=%@;", @"test"] dataUsingEncoding: NSUTF8StringEncoding]];
[highScoreData appendData: [[NSString stringWithFormat: @"score=%d", 0] dataUsingEncoding: NSUTF8StringEncoding]];
[request setHTTPBody: highScoreData];