Network requests are failing - NSURLSession - App Sandbox - Xcode 9 - objective-c

Question

I have a simple GET request that I am trying to run in my macOS application. However I keep getting the following error:
A server with the specified hostname could not be found.
The URL I am trying to download JSON data from is:
https://suggestqueries.google.com/complete/search?client=safari&q=mercedes
If I test it in my browser or in an online API tester website (such as Hurl.it), the request works fine. A JSON file is then downloaded automatically.
However running the request via my macOS app does not work. Here is my code:
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"https://suggestqueries.google.com/complete/search?client=safari&q=mercedes"] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];
[request setHTTPMethod:#"GET"];
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:self delegateQueue:nil];
[[session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
NSLog(#"Data: %#", data);
NSLog(#"Response: %#", response);
NSLog(#"Error: %#", error);
}] resume];
Here is the full error log:
dnssd_clientstub ConnectToServer: connect()-> No of tries: 1
dnssd_clientstub ConnectToServer: connect()-> No of tries: 2
dnssd_clientstub ConnectToServer: connect()-> No of tries: 3
dnssd_clientstub ConnectToServer: connect() failed
path:/var/run/mDNSResponder Socket:6 Err:-1 Errno:1 Operation not
permitted 2017-10-27 09:58:31.610493+0100 search suggestions
[] nw_resolver_create_dns_service_locked
DNSServiceCreateDelegateConnection failed: ServiceNotRunning(-65563)
TIC TCP Conn Failed [1:0x600000164080]: 10:-72000 Err(-65563)
Task <12212C3B-8606-49C2-BD72-AEBD575DB638>.<1> HTTP load failed
(error code: -1003 [10:-72000])
Task
<12212C3B-8606-49C2-BD72-AEBD575DB638>.<1> finished with error - code:
-1003
Data: (null)
Response: (null)
Error: Error Domain=NSURLErrorDomain Code=-1003 "A server with the specified
hostname could not be found." UserInfo={NSUnderlyingError=0x60400004fa20 {Error
Domain=kCFErrorDomainCFNetwork Code=-1003 "(null)"
UserInfo={_kCFStreamErrorCodeKey=-72000,
_kCFStreamErrorDomainKey=10}}, NSErrorFailingURLStringKey=https://www.suggestqueries.google.com/complete/search?client=safari&q=mercedes,
NSErrorFailingURLKey=https://www.suggestqueries.google.com/complete/search?client=safari&q=mercedes,
_kCFStreamErrorDomainKey=10, _kCFStreamErrorCodeKey=-72000, NSLocalizedDescription=A server with the specified hostname could not
be found.}
What am I doing wrong? It's just a simple GET request, I don't understand why the data won't load.

Answer 1

I figured out what was wrong, even though I had set Allow Arbitrary Loads to YES, this is no longer enough to enable network requests.
There is a new setting in Xcode 9 called App Sandbox that can stop incoming/outgoing network connections too! I had to turn this setting off and then all network requests started to work.

Answer 2

In XCode 11.5 I had to check these two flags

Answer 3

You have to turn off the "App Sandbox".
Go to:
xcode Project-> Capabilities -> App SandBox

Answer 4

Please try below code
#property (nonatomic, strong) NSURLConnection *connection;
NSMutableString *urlString = [NSMutableString stringWithString:BASE_URL];
[urlString appendFormat:#"%#",apiName]; //apiName —> Webservice Name
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:urlString]];
[request setValue:#"gF!DeEfFrjqaAaD$gH#Mn#w(z" forHTTPHeaderField:#"PC-API-KEY"]; //Optional Parameter pass if required key
[request setValue:#"application/json" forHTTPHeaderField:#"Accept"];
[request setHTTPMethod:#"POST"]; //if your required Get than [request setHTTPMethod:#"GET"];
[request setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:[parameterDict toJSON]];
[request setTimeoutInterval:45.0];
self.connection =[[NSURLConnection alloc] initWithRequest:request delegate:self];
if (self.connection) {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
self.downLoadedData = [NSMutableData data];
}