使用AFHTTPSessionManager的原始XML Post

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

manager.requestSerializer = [AFHTTPRequestSerializer serializer];
manager.requestSerializer.stringEncoding = NSUTF8StringEncoding;
manager.requestSerializer.HTTPMethodsEncodingParametersInURI = [NSSet setWithObjects:@"GET", @"HEAD", nil];
[manager.requestSerializer setValue:@"application/xml" forHTTPHeaderField:@"Content-Type"];

NSString *xmlString = @"<root><name>John Doe</name></root>";
NSData *xmlData = [xmlString dataUsingEncoding:NSUTF8StringEncoding];
[manager POST:@"http://example.com/api" parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
    [formData appendPartWithFormData:xmlData name:@"xmlData"];
} progress:nil success:^(NSURLSessionDataTask *task, id responseObject) {
    // 请求成功的处理
} failure:^(NSURLSessionDataTask *task, NSError *error) {
    // 请求失败的处理
}];