The operation couldn't be completed (nsurlErrorDomain error -1012) - objective-c

Question

I have checked and applied it's all possible answers but not getting any success because I couldn't find the reason.
I am calling an API and sometimes it is working fine but some time it is giving me "The operation couldn't be completed (nsurlErrorDomain error -1012)" error.
My API calling code:
I have created this global method to call APIs. For this, I have created a singleton class.
-(void)getDispatchDetail:(NSString *)strDispatchId successBlock:(void(^)(NSDictionary *response))successBlock withFailureBlock:(FailureBlock)failureBlock{
NSString *urlString = [NSString stringWithFormat:#"%#%#",BASE_URL,END__POINT_getDispatchDetail];
[self MethodType:POST URL:urlString parameters:#{#"DispatchId":strDispatchId?strDispatchId:#""} withCookies:nil completionBlockWithSuccess:^(id responseObject, NSURLResponse *urlResponse) {
successBlock(responseObject);
} failure:^(NSError *error) {
[ProgressHUD dismiss];
failureBlock(error);
}];
}
-(void)MethodType:(METHOD_TYPE)methodType
URL:(NSString *)urlString
parameters:(NSDictionary *)param
withCookies:(BOOL)isCookies completionBlockWithSuccess:(void (^)(id responseObject, NSURLResponse *urlResponse))success
failure:(void (^)(NSError *error))failureRequest
{
if (isCookies){
//[ProgressHUD show:kSTRING_LOADING Interaction:NO];
}
/**
Create URl based on the Request Type
**/
NSURL *url;
switch (methodType) {
case GET:
if (param) {
NSString *strDict = [self stringFromDictionary:param];
NSString *strURL = [NSString stringWithFormat:#"%#?%#",urlString,strDict];
strURL = [strURL stringByReplacingOccurrencesOfString:#" " withString:#"%20"];
url = [NSURL URLWithString:strURL];
break;
}
url = [NSURL URLWithString:urlString];
break;
case PUT:
case POST:
case DELETE:
url = [NSURL URLWithString:urlString];
break;
default:
break;
}
/**
Create Reuqest based on the Request Type
**/
NSMutableURLRequest *req = [NSMutableURLRequest requestWithURL:url];
switch (methodType) {
case GET:
[req setHTTPMethod:#"GET"];
break;
case POST:
{
[req setHTTPMethod:#"POST"];
NSError *error = nil;
NSData *postData = [NSJSONSerialization dataWithJSONObject:param options:NSJSONWritingPrettyPrinted error:&error];
if (error) {
failureRequest(error);
}
[req setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[req setHTTPBody:postData];
}
break;
case PUT:
{
[req setHTTPMethod:#"PUT"];
NSError *error = nil;
if (param != nil) {
NSData *postData = [NSJSONSerialization dataWithJSONObject:param options:NSJSONWritingPrettyPrinted error:&error];
[req setHTTPBody:postData];
}
if (error) {
failureRequest(error);
}
[req setValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
}
break;
case DELETE:
{
[req setHTTPMethod:#"DELETE"];
}
break;
default:
break;
}
//self.strAccessToken = #"Token ab6520a0805b11e82c750034548b74d02464e900";
//self.strAccessToken = [ETDataModelClass getUserAccessToken];
if ([[NSUserDefaults standardUserDefaults] valueForKey:API_PARAM_USER_ACCESS_TOKEN] != nil) {
NSDictionary *dict = [[NSUserDefaults standardUserDefaults] objectForKey:kUserLoginTokenAndData];
NSString *tokenType = [dict objectForKey:#"token_type"];
self.strAccessToken = [NSString stringWithFormat:#"%# %#",tokenType,[[NSUserDefaults standardUserDefaults] valueForKey:API_PARAM_USER_ACCESS_TOKEN]];
// [self.strAccessToken stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
[req setValue:self.strAccessToken forHTTPHeaderField:API_ACCESS_TOKEN];
}
NSLog(#"ReqType : %# URL : %#, Param : %#", [self getMethodTypeName:methodType], url, param);
NSLog(#"User Token : %#",_strAccessToken);
[req setTimeoutInterval:60.0];
[NSURLConnection sendAsynchronousRequest:req
queue:[NSOperationQueue mainQueue]
completionHandler:^(NSURLResponse *responseHeader, NSData *responseBody, NSError *error)
{
NSError *errorData = nil;
NSLog(#"Response Header : %#", responseHeader);
NSLog(#"Response : %#", [[NSString alloc] initWithData:responseBody encoding:NSUTF8StringEncoding]);
id responseObject1;
if(![responseBody isKindOfClass:[NSNull class]] && responseBody != nil)
responseObject1 = [NSJSONSerialization JSONObjectWithData:responseBody options:NSJSONReadingMutableLeaves error:&errorData];
else{
[ProgressHUD dismiss];
[Utility showAlertMessage:#"No Internet Connection. Make sure your device is connected to the internet." WithTitle:#""];
return ; // When response body nil we will return the control
}
// NSLog(#"Server Response ===> :\n %#", responseObject1);
// NSLog(#"Server Error ===> :\n %#", errorData);
if (error) {
if([responseObject1 isKindOfClass:[NSDictionary class]]){
if([[responseObject1 objectForKey:API_Alert_MESSAGE] isEqualToString:kAutologoutResponseFromServer]){
NSLog(#" Response ===== %# =====", responseObject1);
[[NSNotificationCenter defaultCenter] postNotificationName:kNotificationAutoLogout object:nil userInfo:responseObject1];
}
}
[ProgressHUD dismiss];
failureRequest(error);
return ;
}
else {
//[ProgressHUD dismiss];
if (!errorData) {
if (responseObject1 == nil) {
return [Utility showAlertMessage:NO_DATA_AVAILABLE WithTitle:#""];
}
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) responseHeader;
long statusCode = httpResponse.statusCode;
NSLog(#"statusCode : %ld",statusCode);
switch (statusCode) {
case API_STATUS_CODE_200: case API_STATUS_CODE_402:
if (success) {
success(responseObject1,responseHeader);
}
break;
case API_STATUS_CODE_500: case API_STATUS_CODE_400:
NSLog(#"responseHeader : %#",responseHeader);
NSLog(#"responseBody : %#",[[NSString alloc] initWithData:responseBody encoding:NSUTF8StringEncoding]);
NSLog(#"error : %#",error.localizedDescription);
NSLog(#"%#",[[NSString alloc] initWithData:responseBody encoding:NSUTF8StringEncoding]);
[Utility showAlertMessage:SERVER_ERROR WithTitle:#""];
[ProgressHUD dismiss];
break;
case API_STATUS_CODE_403:{
NSLog(#"auto logout warning : %#",responseBody);
[[NSNotificationCenter defaultCenter] postNotificationName:kNotificationAutoLogout object:nil userInfo:responseObject1];
[ProgressHUD dismiss];
break;
}
default:
NSLog(#"responseHeader : %#",responseHeader);
NSLog(#"responseBody : %#",[[NSString alloc] initWithData:responseBody encoding:NSUTF8StringEncoding]);
NSLog(#"error : %#",error.localizedDescription);
NSLog(#"%#",[[NSString alloc] initWithData:responseBody encoding:NSUTF8StringEncoding]);
if([responseObject1 isKindOfClass:[NSDictionary class]])
if([responseObject1 valueForKey:API_Alert_MESSAGE] && [responseObject1 valueForKey:API_Alert_MESSAGE] != nil)
[Utility showAlertMessage:[responseObject1 valueForKey:API_Alert_MESSAGE] WithTitle:#""];
[ProgressHUD dismiss];
break;
}
}
else{
failureRequest(errorData);
}
}
}];
}