Connecting to the server using NSURLConnection objective c - ios

Question

I'm trying to connect my application to the backend using NSURLConnection.
When I use postman everything works really fine and I get the expected result.
But when I try that in my code I get a totally different result, which is a JSON object from the server but with an error message.
Please check the following pictures and the code I use for more details.
Any idea will be really appreciated .
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];
NSString *urlStr=[NSString stringWithFormat:#"URL"];
NSURL* _url=[NSURL URLWithString:urlStr];
[request setURL:_url];
[request setHTTPMethod:#"POST"];
[request setValue:#"application/x-www-form-urlencoded" forHTTPHeaderField:#"Content-Type"];
[request setValue:#"Bearer ---" forHTTPHeaderField:#"Authorization"];
NSArray *keys= [[NSArray alloc] initWithObjects:#"email",#"firebase_token",#"password",#"username",#"phone",#"uploaded_file", nil];
NSArray *values = [[NSArray alloc] initWithObjects:email,#"token",password,userName,phone,#"#/C:/Users/admin/Downloads/chili house.png", nil];
NSDictionary *params = [[NSDictionary alloc] initWithObjects:values forKeys:keys];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:params
options:NSJSONWritingPrettyPrinted
error:&error];
[request setHTTPBody:jsonData];
NSString *jsonString;
if ( jsonData) {
jsonString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
}
[request setHTTPBody:jsonData];
NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
[connection start];
}
-(void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge{
if ([challenge previousFailureCount] == 0) {
NSURLCredential *newCredential;
newCredential = [NSURLCredential credentialWithUser:#"User"
password:#"Password"
persistence:NSURLCredentialPersistenceNone];
[[challenge sender] useCredential:newCredential
forAuthenticationChallenge:challenge];
} else {
[[challenge sender] cancelAuthenticationChallenge:challenge];
}
}
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData*)data{
[self.responseData appendData:data];
}
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error
{
NSLog(#"Connection failed: %#", [error description]);
}
- (BOOL)connection:(NSURLConnection *)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace *)protectionSpace {
return YES;
}
- (void) connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
[self.responseData setLength:0];
}
- (NSCachedURLResponse *) connection:(NSURLConnection *)connection willCacheResponse:(NSCachedURLResponse *)cachedResponse {
return nil;
}
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
[[BusyAgent defaultAgent] makeBusy:NO];
NSString *responseString = [[NSString alloc] initWithData:self.responseData encoding:NSUTF8StringEncoding];
if (responseString == (id)[NSNull null] || responseString.length == 0 ){
NSLog(#"responseString= %#",responseString);
}else{
NSLog(#"responseString = %#",responseString);
UIAlertView *alert=[[UIAlertView alloc] initWithTitle:nil message:responseString delegate:self cancelButtonTitle:nil otherButtonTitles:#"Ok", nil];
[alert show];
}
self.responseData = nil;
}