AFNetworking getting data for XML parse error

Question

This is my AFHTTPClient singleton:

+ (API *)sharedInstance
{
static API *sharedInstance = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
    sharedInstance = [[API alloc] initWithBaseURL:[NSURL URLWithString:kAPIHost]];
    [sharedInstance setParameterEncoding:AFJSONParameterEncoding];
    [sharedInstance registerHTTPOperationClass:[AFXMLRequestOperation class]];
    [sharedInstance setDefaultHeader:@"Accept" value:@"application/rss+xml"];
});

return sharedInstance;
}

And method in same class (AFHTTPClient):

- (void)requestXMLDataCompletion:(JSONResponseBlock)completionBlock
{
NSMutableURLRequest *apiRequest = [self requestWithMethod:@"GET" path:kAPIPath parameters:nil];

AFXMLRequestOperation *operation = [[AFXMLRequestOperation alloc] initWithRequest:apiRequest];

[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject){
    // success
    completionBlock(responseObject);
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    // failure
    completionBlock([NSDictionary dictionaryWithObject:[error localizedDescription] forKey:@"error"]);
}];

[operation start];
}

When I call this function to get XML from RSS I get this error:

error = "Expected content type {(\n    \"application/xml\",\n    \"text/xml\"\n)}, got application/rss+xml";

Question:

Is whole concept of implemented singleton good and do I need any changes ?
Is there any suggestion if whole concept is wrong ?
Why am I getting this error?

Thanks.

score 3 · Accepted Answer · edited Jun 20 '20 at 09:12

3

Concept of Singleton

A singleton is more commonly known as a design pattern. Usually a singleton is a class and behaves exactly like any other class, the only exception being that any instances of a singleton reference the same object data. This means that any instance of a singleton class are actually all the same instance.

You can check out Singleton Pattern for more information and sample code to enforce how the singleton will be used.

Is there any suggestion if whole concept is wrong ?

I would suggest you to use Singleton for AFNetworking since you will have only one instance of it.
Your Error

The error you are getting is because AFNetworking request wants Header Content-Type as "application/xml" or "text/xml"

Try changing this code:

[self registerHTTPOperationClass:[AFXMLRequestOperation class]];

to

[self registerHTTPOperationClass:[AFHTTPRequestOperation class]];

edited Jun 20 '20 at 09:12

Community

1
1

answered May 27 '13 at 20:02

icodebuster

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Should I even download xml data like this or is there any easier way ? I mean, this is great way of downloading json but dunno for xml. I got it with AFHTTPRequestOperation replacing AFXMLOperation in singleton and in my custom method. So I don't want to parse data with AF (will do it with GDataXML) but is this good way of downloading data ? Tnx. – zhuber May 27 '13 at 20:22
Do I even need to return it in NSDictionary ? Or should I return whole data as NSArray ? – zhuber May 27 '13 at 20:24
You can use NSDictionary and the user `valueForKey:` to get data. – icodebuster May 27 '13 at 20:26
Can you provide xml sample data. – icodebuster May 27 '13 at 20:26
What exactly you need to do. – icodebuster May 27 '13 at 20:31
Parse that feed to get text, images and stuff for every news. – zhuber May 27 '13 at 20:32
let us [continue this discussion in chat](http://chat.stackoverflow.com/rooms/30711/discussion-between-icodebuster-and-user1832330) – icodebuster May 27 '13 at 20:32

score 1 · Answer 2 · answered Oct 20 '14 at 15:17

I had a similar problem:

Error Domain=AFNetworkingErrorDomain Code=-1016 "Expected content type {(
    "text/xml",
    "application/xml"
)}, got application/rss+xml"

The answer above is not full and clear, although it helped me a lot after I read their chat. registerHTTPOperationClass doesn't help. I decided to provide some code. Solution is to NOT use this:

[AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser)

But download RSS XML using AFHTTPRequestOperation and create NSXMLParser manually:

NSString *articlesUrlString = @"http://pro.rabota.ru/feed/moscow.content.rss";
AFHTTPClient *httpClient = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:articlesUrlString]];
NSMutableURLRequest *request = [httpClient requestWithMethod:@"GET" path:@"" parameters:nil];

AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {

  NSData *xmlData = (NSData *)responseObject;
  NSXMLParser *XMLParser = [[NSXMLParser alloc] initWithData:xmlData];
  XMLParser.delegate = self;
  [XMLParser parse];

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {

  NSLog(@"error: %@", error);

}];

AFNetworking getting data for XML parse error

2 Answers2