ios - Server receives no data from NSURLSessionUploadTask -

i'm trying upload file via multipart request using nsurlsessionuploadtask via afnetworking. request executes , receives response server, server not receiving data in form.

ios code

nsstring *urlstring = [[nsurl urlwithstring:urlstring relativetourl:self.baseurl] absolutestring]; nserror *error = nil;  nsmutableurlrequest *request = [self.requestserializer multipartformrequestwithmethod:@"post" urlstring:urlstring parameters:params constructingbodywithblock:^(id<afmultipartformdata> formdata) {     //    [formdata appendpartwithfiledata:[nsdata datawithcontentsofurl:[nsurl fileurlwithpath:path]]                                name:@"video"                            filename:[path lastpathcomponent]                            mimetype:@"video/mp4"]; } error:&error];  if ([account isauthenticated]) {;     nsstring *authheader = [nsstring stringwithformat:@"bearer %@", account.accesstoken];     [request setallhttpheaderfields:@{@"authorization": authheader}]; }  nsurlsessionuploadtask *task = [self uploadtaskwithstreamedrequest:request progress:progress completionhandler:^(nsurlresponse * __unused response, id responseobject, nserror *error) {     if (error) {      } else {      } }]; [task resume]; 

here header info request afnetworkingactivitylogger:

post 'http://127.0.0.1:8000/upload/': { "accept-language" = "en;q=1, fr;q=0.9, de;q=0.8, zh-hans;q=0.7, zh-hant;q=0.6, ja;q=0.5"; authorization = "bearer 270f985de7ebf0aa49b7ff1cad8377e007141f94"; "content-length" = 225974; "content-type" = "multipart/form-data; boundary=boundary+4597b504492e1006"; "user-agent" = "test/1.0 (ipad simulator; ios 7.1; scale/1.00)"; } (null) 

i'm using django on server side. here's test view:

class uploadview(view):  def post(self, request, *args, **kwargs):     logger.debug("files: {0} | data: {1}".format(request.files, request.post))     return httpresponse(content=json.dumps({"test": "2"}), content_type='application/json') 

but both files , post objects empty:

files: <multivaluedict: {}> | data: <querydict: {}> 

this works without multipart request- sending post request without file upload querydict populated. 1 thing i'm unsure fact body of request "(null)" according afnetworkingactivitylogger output.

any appreciated! i'm stumped.

from docs -[nsurlsession uploadtaskwithstreamedrequest:] (looks using):

... body stream , body data in request object ignored, , nsurlsession calls delegate’s urlsession:task:neednewbodystream: method provide body data.

have implemented delegate method?

https://developer.apple.com/library/ios/documentation/foundation/reference/nsurlsession_class/introduction/introduction.html#//apple_ref/doc/uid/tp40013435-ch1-sw28