What a better used for post file. IOS

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I need to send image File on PHP server $_FILE. multipart/form-data. What need to used? NSURLSession, NSURLConnection, or something else? And please write example.

When used

    [body appendData:[[NSString stringWithFormat:@"--%@\r\n", boundary] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=%@; filename=imageName.jpg\r\n", @"imageFormKey"] dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
    [body appendData:imageData];
    [body appendData:[[NSString stringWithFormat:@"\r\n"] dataUsingEncoding:NSUTF8StringEncoding]];

post is --

 --
     Content-Disposition: form-data; name   "avatar[image]"; filename="image.jpg"
     Content-Type: application/octet-stream

     ¤Ў¤аJFIF¤бXExifMM*Зi††ф†ф¤џC¤џC¤јфф¤ƒ¤ƒµ}!1AQa"q2БС°#B±ЅR—р$3brВ%         '()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyzГДЕЖЗИЙКТУФХЦЧШЩЪ¢        £§•¶І®©™≤≥іµ∂ЈЄєЇ¬√ƒ≈∆«»… “”‘’÷„ЎўЏбвгдежзийкстуфхцчшщъ¤ƒ   
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and so on...

asked 2 mins ago

Gend

15

What a better used for post file. IOS