Open Radar

 
06-Jul-2012 02:22 PM Heath Borders:
Summary:
The documentation to -[NSMutableURLRequest setAllHTTPHeaderFields:] says:

Replaces the receiver's header fields with the passed values.

However, fields not present in the given NSDictionary are not removed from the NSMutableURLRequest.

Steps to Reproduce:

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://apple.com"]];
[request addValue:@"bar" forHTTPHeaderField:@"foo"];
[request setAllHTTPHeaderFields:[NSDictionary dictionaryWithObject:@"bar2" forKey:@"foo2"]];

NSLog(@"%@", [request allHTTPHeaderFields]);

Expected Results:
foo2=bar2

Actual Results:
foo=bar
foo2=bar2

Regression:

Notes:
If this is expected behavior, then make it explicit in the documentation that it will only replace existing values rather than replacing headers. Replacing headers implies it replaces the entire dictionary.