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Nsurlconnection

An NSURLConnection is the Apple Foundation Framework class that provides support to perform the loading of a URL request

Nsurlsession

NSURLSession is the API for HTTP connections introduced in iOS 7 and OS X 10.9.



Others

Example

It s not my experience that nsurlsession is any slower than nsurlconnection is

from question  

Network iOS : Background / MainThread?

Use nsurlsession instead;it replaces nsurlconnection and is far better

from question  

Swift NSURLConnection deprecated in iOS 9.0

Nsurlsession is much more powerful tool than nsurlconnection

from question  

How to receive list of binaries from server in iOS

Nsurlconnection is a much older api introduced in os x 10.2;nsurlsession was introduced in os x 10.9 and has a more modern task- and block-based api

from question  

Exact Difference between NSURLConnection and NSUrlSession?

Using completionhandler -based methods of nsurlsession is much easier

from question  

Using NSURLSession to POST, what is the correct way to post the variables?

Nsurlsession also provides nicer interfaces for requesting data using blocks in that it allows you to combine them with delegate methods for doing custom authentication handling redirect handling etc. whereas with nsurlconnection if you suddenly realized you needed to do those things you had to refactor your code to not use block-based callbacks

from question  

What are the difference among NSURLConnection, NSURLSession and AFNetworking?

Nsurlconnection cannot help you there;nsurlsession has a facility for uploading files in the background outside of that time

from question  

Does NSUrlSession Prevent the Application from suspending?

Nsurlsession is newer than nsurlconnection if you are using swift language then you can use your own custom methods by using nsurlsession or you can use alamofire

from question  

Which is easy to use Afnetworking/Nsurlsession/Alamofire

A bit of history before nsurlsession came out a third party library afnetworking became the de facto standard for doing networking in objective c as it provided an easier and more convenient api than nsurlconnection which it was a wrapper around - i think these days it wraps nsurlsession instead

from question  

What is the advantage of using Alamofire over NSURLSession/NSURLConnection for networking?

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