How to perform a GET request and check the response - ios

Question

I have a NSString which contains the URL. I want to make a GET request using the URL and also check if the response is 200.
With the current code i get response as 0.
Here is my code:
NSString *Url = #"http://www.xyx.com";
NSData *data = [Url dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *len = [NSString stringWithFormat:#"%lu", (unsigned long)[data length]];
NSMutableURLRequest *req = [[NSMutableURLRequest alloc]init];
[req setURL:[NSURL URLWithString:Url]];
[req setHTTPMethod:#"GET"];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
[[session dataTaskWithRequest:req completionHandler:^(NSData data, NSURLResponse response, NSError *error) {
NSString *req = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
NSLog(#"Reply = %#", req);
}]resume];

Answer 1

use this code it works for you:
-(void)yourMethodNAme
{
NSString *post = #"";
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:#"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
[request setURL:[NSURL URLWithString:#"Your URL"]];
[request setHTTPMethod:#"POST"];
[request setValue:postLength forHTTPHeaderField:#"Content-Length"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setHTTPBody:postData];
NSURLResponse *response;
NSError *err;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
//NSString *str=[[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
//NSLog(#"str : %#",str);
NSDictionary *dict6 = [self cleanJsonToObject:responseData];
//NSLog(#"str : %#",dict6);
}
- (id)cleanJsonToObject:(id)data
{
NSError* error;
if (data == (id)[NSNull null])
{
return [[NSObject alloc] init];
}
id jsonObject;
if ([data isKindOfClass:[NSData class]])
{
jsonObject = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
}
else
{
jsonObject = data;
}
if ([jsonObject isKindOfClass:[NSArray class]])
{
NSMutableArray *array = [jsonObject mutableCopy];
for (int i = (int)array.count-1; i >= 0; i--)
{
id a = array[i];
if (a == (id)[NSNull null])
{
[array removeObjectAtIndex:i];
} else
{
array[i] = [self cleanJsonToObject:a];
}
}
return array;
}
else if ([jsonObject isKindOfClass:[NSDictionary class]])
{
NSMutableDictionary *dictionary = [jsonObject mutableCopy];
for(NSString *key in [dictionary allKeys])
{
id d = dictionary[key];
if (d == (id)[NSNull null])
{
dictionary[key] = #"";
} else
{
dictionary[key] = [self cleanJsonToObject:d];
}
}
return dictionary;
}
else
{
return jsonObject;
}
}
and finally call it in ViewDidLoad as [self yourMethodNAme];

Answer 2

-(void) httpGetWithCustomDelegateWithString: (NSString*)urlString
{
[self startActivity];
[[UIApplication sharedApplication] beginIgnoringInteractionEvents];
NSURLSessionConfiguration *defaultConfigObject = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *defaultSession = [NSURLSession sessionWithConfiguration: defaultConfigObject delegate: nil delegateQueue: [NSOperationQueue mainQueue]];
NSURL *url = [NSURL URLWithString:urlString];
NSURLSessionDataTask *dataTask =[defaultSession dataTaskWithURL:url completionHandler:^(NSData *data, NSURLResponse *response, NSError *error)
{
NSLog(#"Response:%# %#\n", response, error);
if(error == nil)
{
//NSString * text = [[NSString alloc] initWithData: data encoding: NSUTF8StringEncoding];
//NSLog(#"Data = %#",text);
id jsonObject = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableLeaves error:&error];
deserializedDictionary = nil;
if (jsonObject != nil && error == nil)
{
if ([jsonObject isKindOfClass:[NSDictionary class]])
{
//Convert the NSData to NSDictionary in this final step
deserializedDictionary = (NSDictionary *)jsonObject;
NSLog(#"dictionary : %#",deserializedDictionary);
}
if ([jsonObject isKindOfClass:[NSArray class]])
{
deserializedArr = (NSArray*)jsonObject;
NSLog(#"array : %#",deserializedArr);
}
}
[self setAlert];
}
else
{
[activityView removeFromSuperview];
[[UIApplication sharedApplication] endIgnoringInteractionEvents];
[self showAlert:#"Error" :#"Network error occured." :#"Ok"];
}
}];
[dataTask resume];
}
just use the above code and call it by
[self httpGetWithCustomDelegateWithString:#"webStringHere"];
On Completion, it will call the method -(void)setAlert; so declare it in your class where you use this.

Answer 3

This may be due to App Transport Security blocking HTTP.
App Transport Security has blocked a cleartext HTTP (http://) resource load since it is insecure. Temporary exceptions can be configured via your app's Info.plist file.
Try making a request to a secure site (e.g. https://www.google.com) as a test.