IOS SDK Post request using NSURLConnection

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Abin Cheriyan

Sep 29, 2015, 8:06:29 AM9/29/15
to iPhone SDK Development

Below is my code for sending a post request consisting of 4 base64Image data to my server.

NSString *postURL = [NSString stringWithFormat:@"name=%@&mobile=%@&email=%@&bday=%@&image=%@&img1=%@&img2=%@&img3=%@",@"abin",@123",@"",@"01-01-1990",[base64Value]image,[base64 value] of img1,[base64 value] of img2,[base64 value] of img3"];

NSData *postData = [postURL dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%lu",(unsigned long)[postData length]];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] init];

[request setURL:[NSURL URLWithString:@"MY_URL"]];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
conn = [[NSURLConnection alloc]initWithRequest:request delegate:self];

Here all the image values img1,image,image are base64 values.

While sending this request to the server, 6 out of 10 times, it gets failed.

Over Wi-Fi success rate is high and over Mobile Data it is very low.

Image conversion is done using the below code:

- (NSString *)encodeToBase64String:(UIImage *)image {
NSData *data = UIImageJPEGRepresentation(image, 1.0);
NSData *imageBase64Data = [data base64EncodedDataWithOptions:0];
NSString *imageBase64String = [[NSString alloc] initWithData:imageBase64Data encoding: NSUTF8StringEncoding];
return imageBase64String;

Any once please help me with some idea to successfully send multiple images to Server using POST request even when the network connectivity is slow.(2G)

Jesse Tayler

Sep 29, 2015, 8:08:45 AM9/29/15

On Sep 29, 2015, at 7:58 AM, Abin Cheriyan <> wrote:

While sending this request to the server, 6 out of 10 times, it gets failed.

what is the error?

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