AFNetworking extenstion for updating file with HTTP header "If-Modified-Since" and status code 304.

This operation checks whether file exists, gets last modification date and send this date to the server. If the file is up-to-date, then operation recieves 304 status code and load from local.

All of this is working when server understands "If-Modifed-Since" HTTP header and you are not touching to the file, so the last modification date is synchronized with server. Excellent example is updating images.

Example

NSURLRequest * request = // some request
NSString * localPath = // path where the file is located or should be if is not created
AFHTTPFileUpdateOperation * op = [[AFHTTPFileUpdateOperation alloc] initWithRequest:request localPath:localPath];
[op setCompletionBlockWithSuccess:^(AFHTTPFileUpdateOperation *operation, NSData * data) 
{
    // using updated data
}
failure:^(AFHTTPFileUpdateOperation *operation, NSError *error)
{
    // Error handling
}];

License

The MIT License (MIT)

Copyright (c) 2013 Roman Kříž

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.