NSURLSession and amazon S3 uploads

Question

I have an app which is currently uploading images to amazon S3. I have been trying to switch it from using NSURLConnection to NSURLSession so that the uploads can continue w

Answer 1

I don't know NSURLSessionUploadTask very well yet but I can tell you how I would debug this.

I would use a tool like Charles to be able to see HTTP(S) requests that my application makes. The problem is likely that the NSURLSessionUploadTask ignores a header that you set or it uses a different HTTP method than Amazon's S3 expects for the file upload. This can be easily verified with an intercepting proxy.

Also, when Amazon S3 returns an error like 403, it actually sends back an XML document that has some more information about the error. Maybe there is a delegate method for NSURLSession that can retrieve the response body? If not then Charles will certainly give you more insight.