iOS9 apple changed the http protocol to the https protocol method

Solutions:

Join key in info.plist

<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>

The following is an introduction to access to the http and https protocols in ios

Recently, I worked on a project. At the beginning, I used HTTP protocol to realize the interaction between the client and the server. Later, I needed to change it to HTTPS protocol. Some problems were found in the process of modification, and the solutions are as follows:

HTTP:

NSString *urlString =[NSString stringWithFormat:@"https://127.0.0.1/default.aspx?USER=%@",@"111"];
NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease];
[request setURL:[NSURL URLWithString:urlString]];
[request setHTTPMethod:@"GET"];
NSHTTPURLResponse* urlResponse = nil;
NSError *error = [[NSError alloc] init];
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&urlResponse error:&error];
NSMutableString *result = [[NSMutableString alloc] initWithData:responseData encoding:NSUTF8StringEncoding];
NSLog(@"The result string is :%@",result); 

HTTPS

Events trigger

{ 
NSString *urlString =[NSString stringWithFormat:@"https://127.0.0.1/default.aspx?USER=%@",@"111"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:urlString] cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:5];
// Set the request mode as get
[request setHTTPMethod:@"GET"];
// Adding user sessions id
[request addValue:@"text/html" forHTTPHeaderField:@"Content-Type"];
// Connection send request 
finished = false;
NSURLConnection *conn = [[NSURLConnection alloc] initWithRequest:request delegate:self];
// Block the thread and wait for the end 
while(!finished) {
[[NSRunLoop currentRunLoop] runMode:NSDefaultRunLoopMode beforeDate:[NSDate distantFuture]];
}
} 
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse*)response 
{}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{
//[_waitingDialog dismissWithClickedButtonIndex:0 animated:NO];
[connection release];
}
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{ 
}
- (BOOL)connectionShouldUseCredentialStorage:(NSURLConnection *)connection{
return NO;
}
// The following two paragraphs are the focus, to the server side single HTTPS  Validation, iOS  The client ignores certificate validation. 
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
return [protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];
} 
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { 
NSLog(@"didReceiveAuthenticationChallenge %@ %zd", [[challenge protectionSpace] authenticationMethod], (ssize_t) [challenge previousFailureCount]);
if ([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]){
[[challenge sender] useCredential:[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust] forAuthenticationChallenge:challenge];
[[challenge sender] continueWithoutCredentialForAuthenticationChallenge: challenge];
}
} 
NSLog(@"get the whole response");
//[receivedData setLength:0];
}
// Process the data  
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{ 
}