怎么样上传音频文件（NSData方法）

http上传 把文件以body形式上传到服务器 

```

NSFileHandle* handler = [NSFileHandle fileHandleForReadingAtPath:_fileURL];

[handler seekToFileOffset:(unsigned long long)_range.location];

NSData* body = [handler readDataOfLength:_range.length];

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]];

[request setHTTPMethod:@"POST"];

[request setValue:@"video/mp4" forHTTPHeaderField:@"Content-Type"];

[request setValue:[NSString stringWithFormat:@"%d",body.length] forHTTPHeaderField:@"Content-Length"];

[request setValue:@"no-cache" forHTTPHeaderField:@"Cache-Control"];

[request setHTTPBody:body];

```

然后服务器接收body 二进制流