Add body fields to NSMutableURLRequest

How would I add key value pairs to the body of a NSMutableURLRequest? I know I could use something like this:

NSURL *url = [[NSURL alloc] initWithString:@"http://localhost:8080/upload/"];
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];
[request setHTTPMethod:@"POST"];
NSString *bodyContents = @"fileName=";
[bodyContents stringByAppendingString:fileName];
[bodyContents stringByAppendingString:@"&"];
[bodyContents stringByAppendingString:@"deviceName="];
[bodyContents stringByAppendingString:deviceName];
[bodyContents stringByAppendingString:@"fileContents="];
[bodyContents stringByAppendingString:fileContents];

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But that seems like a lot of hassle, especially if I get to where I need to submit a lot of values in a request. I would hope apple would provide a method like

[request addBodyField:@"fileName":fileName] 

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or something equally useful, but I haven't been able to find one in the documentation. Is there one I'm missing or should I just stick to appending strings?
Curtis LongAsked:
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pgnatyukCommented:
Looks like you need:
[request setHTTPBody:data];
where data is an NSData object that can be made for example so:
NSString *text = @"param=first&param=second";
NSData *data = [text dataUsingEncoding:NSASCIIStringEncoding]];

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Curtis LongAuthor Commented:
That's what I'm thinking too, but I don't like building the string manually, but if that's all I've got access to then I guess it's what I'll use
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