How can I achieve a "configurable" NSURLSession shared session? - ios

Question

I want to change the timeout on my HTTP requests. I'm on a project that uses extensively [NSURLSession sharedSession]. I know that I can't change the configuration of that session (it hasn't one at all).
I know I can define a session with my own config (and I can use as baseline [NSURLSessionConfigurationdefaultSessionConfiguration]), but I don't know how similar is this config to the shared one. The shared one has pre-configured cookie storage policies, cache, etc...
TL;DR I want a session exactly equals to sharedSession, but with a larger timeout. How I can achieve that?
Thanks in advance

Answer 1

One option is to not touch the session, but the requests, using either requestWithURL:cachePolicy:timeoutInterval: or by setting timeoutInterval manually (on an NSMutableURLRequest in the latter case, of course).
Otherwise, you can:
copy the configuration of the sharedSession, (using copy), and modify it
create a new session with this modified configuration, and the same delegate and delegate queue.
Something along the lines of:
NSURLSession *sharedSession = [NSURLSession sharedSession];
NSURLSessionConfiguration *configuration = sharedSession.configuration.copy;
configuration.timeoutIntervalForRequest = whatever;
return [NSURLSession sessionWithConfiguration:configuration delegate:sharedSession.delegate delegateQueue:sharedSession.delegateQueue];
(not tested, but you get the idea).
Of course, you would do this in your own singleton class if you want to reuse the same session.

Answer 2

Sample code for NSURLSessionConfiguration
// Instantiate a session configuration object.
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
configuration.timeoutIntervalForRequest = 300;
configuration.HTTPAdditionalHeaders = #{#"Accept" : #"application/xml", #"Content-Type" : #"application/xml; charset=UTF-8", #"User-Agent" : userAgent};
// Instantiate a session object.
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration];
// Create a data task object to perform the data downloading.
NSURLSessionDataTask *task = [session dataTaskWithURL:[NSURL URLWithString:"http://myexample.com"] completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error != nil) {
// If any error occurs then just display its description on the console.
NSLog(#"Server ERROR: \n "
"CODE: %ld, \n "
"LOCALIZED DESCRIPTION: %# \n "
"DESCRIPTION: %# \n "
"FAILURE REASON: %# \n "
"RECOVERY OPTION: %# \n "
"RECOVERY SUGGESTION: %# \n",
(long)[error code],
[error localizedDescription],
error.description,
error.localizedFailureReason,
error.localizedRecoveryOptions,
error.localizedRecoverySuggestion);
}
else {
// If no error occurs, check the HTTP status code.
NSInteger HTTPStatusCode = [(NSHTTPURLResponse *)response statusCode];
if (HTTPStatusCode == 200) {
//Initialize XML parsing with the response data
/*NSString *str = [[NSString alloc]initWithData: data encoding: NSUTF8StringEncoding];
NSLog(#"The URLSession response is: %# \n", str);*/
}
}
}];
// Resume the task.
[task resume];