How to send base64 string through NSUrlSession IOS - ios

Question

As I'm converting images to base64 string and uploading it to serer using NSURLSessionsDataTask for example-
NSString *encodedString = [[self encodeToBase64String:imgParcel]stringByReplacingOccurrencesOfString:#"+" withString:#"%2B"];
[self.package.arrParcelImages addObject:encodedString]
and sending it like this...
NSDictionary *postParameters = #{#"userID":#"1",#"images":self.package.arrParcelImages}
NSData *postData = [NSJSONSerialization dataWithJSONObject:postParameters options:NSJSONWritingPrettyPrinted error:&error];
NSString *dataString = = [[NSString alloc] initWithData:postData encoding:NSUTF8StringEncoding];
NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];
NSURL *url = [NSURL URLWithString:urlString];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
[request addValue:#"application/json" forHTTPHeaderField:#"Content-Type"];
[request addValue:#"image/png" forHTTPHeaderField:#"Content-Type"];
NSString *strValue = [NSString stringWithFormat:#"%#",[USER_DEFAULTS objectForKey:UD_X_API_VALUE]];
if (strValue != nil) {
[request addValue:strValue forHTTPHeaderField:[USER_DEFAULTS objectForKey:UD_X_API_KEY]];
}
[request setHTTPMethod:#"POST"];
[request setHTTPBody:postData];
NSURLSessionDataTask *postDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *taskData, NSURLResponse *taskResponse, NSError *taskError) {
//NSLog(#"Start - Response:%# %#\n", taskResponse, taskError);
dispatch_async(dispatch_get_main_queue(), ^{
if (taskError) {
NSLog(#" Error = %#",[taskError localizedDescription]);
completionBlock(nil,taskError,task);
}
else {
NSError* error;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:taskData options:kNilOptions error:&error];
if (json) {
NSLog(#" JSON = %#",json);
}
else {
NSString* newStr = [[NSString alloc] initWithData:taskData encoding:NSUTF8StringEncoding];
NSLog(#"Error: %#",newStr);
}
completionBlock(json,nil,task);
}
});
}];
[postDataTask resume];
But This is not uploading base64 string to server what i'm doing wrong please help

Answer 1

If you're including the base64 image in JSON, you should not percent escape the + characters. You only do that if you are creating x-www-form-urlencoded requests.
So, do not replace the + characters with %2B.
You are setting the Content-Type header twice. Your request is JSON, so remove the image/png header. Some web services will just blithely assume the content type, but perhaps yours is getting confused by the incorrect Content-Type header.
If it's still not working, the problem could either be how you created the base64 rendition of the image or the request is not formatted correctly. It's hard to know without seeing (a) what the final request looked like; and (b) precisely what the server is looking for.