Home/ Questions/Q 4624548
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-22T03:08:43+00:00

When do I actually get my response code 200 for a valid request for

  • 0

When do I actually get my response code 200 for a valid request for an image? Is it after all of the data has been downloaded to my browser or which ever device is requesting the image?

I am using the library http://allseeing-i.com/ASIHTTPRequest/ to download images in my iPad app and using the download directly to a file option and then deleting the file if it was a 404 error or any other status code than 200.

ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setDownloadDestinationPath:@"/Users/ben/Desktop/my_file.jpg"];

Problem is partial responses seem to be getting saved during slow connections so I end up with blank or corrupt images.

I decided instead to save the data stream to disk only after I received a status code of 200:

NSURL *url = [NSURL URLWithString: [[NSString stringWithFormat:kProductImagesURL, fileName] stringByAppendingString:tStamp]];
ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:url];
[request setTimeOutSeconds:10];
[request startSynchronous];

int statusCode = [request responseStatusCode];
 if (statusCode==200) {
     NSData *responseData = [request responseData];
     [responseData writeToFile:[savePath stringByReplacingOccurrencesOfString:@"%20" withString:@" "] atomically:YES];
    }

I just want to make sure that the response code only comes back after the request has been completed and all of the data has been downloaded. I am 99% sure that is the case but can’t afford another app release with an image bug like this in it.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    There are two reasons you should probably consider switching to an asynchronous request. The first is, it frees up your main thread to interact with the user (even a modal spinner would be nice–otherwise it looks like your app has frozen).

    Second, it gives you callbacks that only happen once the whole request is finished. I can’t really explain only having gotten partial data with the code you showed, but I’ve never once had that problem using ASI’s asynchronous methods.

    • 0