Create a multipart for request for posting

gistfile1.m

Use like this:

NSData* fileData = UIImageJPEGRepresentation(profileImage, 0.8f);
NSMutableURLRequest *request = [self.httpClient requestWithMethod:@"POST" path:@"api/users/updateSettings" parameters:params];
[self setupMultipartRequest:request withParams:params data:fileData dataName:@"profileImage"];


-(void) setupMultipartRequest:(NSMutableURLRequest *) request withParams:(NSDictionary *) params data:(NSData *) data dataName:(NSString *) dataName {
  //Add the header info
	NSString *stringBoundary = @"0xKhTmLbOuNdArY";
	NSString *contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@",stringBoundary];
	[request addValue:contentType forHTTPHeaderField: @"Content-Type"];
	
	//create the body
	NSMutableData *postBody = [NSMutableData data];
	[postBody appendData:[[NSString stringWithFormat:@"--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
	
	//add key values from the NSDictionary object
	for (NSString *key in params.allKeys) {
		NSString *param = [params objectForKey:key];
		[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"\r\n\r\n", key] dataUsingEncoding:NSUTF8StringEncoding]];
		[postBody appendData:[[NSString stringWithFormat:@"%@",param] dataUsingEncoding:NSUTF8StringEncoding]];
		[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
	}
    
	//add data field and file data
//    Content-Disposition: form-data; name="imageData"; filename="image.jpg"
//    Content-Type: image/jpeg
	[postBody appendData:[[NSString stringWithFormat:@"Content-Disposition: form-data; name=\"%@\"; filename=\"image.jpg\"\r\n", dataName] dataUsingEncoding:NSUTF8StringEncoding]];
	[postBody appendData:[@"Content-Type: image/jpeg\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
	[postBody appendData:[NSData dataWithData:data]];
	[postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]];
	
	//add the body to the post
	[request setHTTPBody:postBody];
}