How to send Image to amazon s3 server in ios - ios

Question

I am using below code to send image from gallery to amazon server in ios but it is not successful. May i know the format in which it need to send and do i need to pass just the file name or the entire path of the image?
Thanks.
NSDictionary *headers = #{ #"content-type": #"multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW",
#"x-access-token": #"eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJ1c2UxOTAiLCJpc3MiOiJodHRwczovL3d3dy5oY3VlLmNvIiwicGVybWlzc2lvbnMiOiJhdXRoZW50aWNhdGVkIiwidXNlcmlkIjpudWxsLCJpYXQiOjE0ODYyMDczNDB9.ewu2QtoHl1kBSrM1y6yL9Jr58kiGmhCsy2YWoFrE2OU",
#"cache-control": #"no-cache",
};
NSArray *parameters = #[ #{ #"name": #"username", #"fileName": localFilePath} ];
NSString *boundary = #"----WebKitFormBoundary7MA4YWxkTrZu0gW";
NSError *error;
NSMutableString *body = [NSMutableString string];
for (NSDictionary *param in parameters) {
[body appendFormat:#"--%#\r\n", boundary];
if (param[#"fileName"]) {
[body appendFormat:#"Content-Disposition:form-data; name=\"%#\"; filename=\"%#\"\r\n", param[#"name"], param[#"fileName"]];
[body appendFormat:#"Content-Type: %#\r\n\r\n", param[#"contentType"]];
[body appendFormat:#"%#", [NSString stringWithContentsOfFile:param[#"fileName"] encoding:NSUTF8StringEncoding error:&error]];
if (error) {
NSLog(#"%#", error);
}
} else {
[body appendFormat:#"Content-Disposition:form-data; name=\"%#\"\r\n\r\n", param[#"name"]];
[body appendFormat:#"%#", param[#"value"]];
}
}
[body appendFormat:#"\r\n--%#--\r\n", boundary];
NSData *postData = [body dataUsingEncoding:NSUTF8StringEncoding];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:#"http://zambalauploaddev.ap-southeast-1.elasticbeanstalk.com/upload"]
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:10.0];
[request setHTTPMethod:#"POST"];
[request setAllHTTPHeaderFields:headers];
[request setHTTPBody:postData];
NSURLSession *session = [NSURLSession sharedSession];
NSURLSessionDataTask *dataTask = [session dataTaskWithRequest:request
completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if (error) {
NSLog(#"%#", error);
} else {
NSHTTPURLResponse *httpResponse = (NSHTTPURLResponse *) response;
NSLog(#"%#", httpResponse);
NSDictionary * responseDict = [NSJSONSerialization JSONObjectWithData:data options:0 error:nil];
NSLog(#"Reponse Dict:%#",responseDict);
}
}];
[dataTask resume];