Unlimited Backgrounding on iOS

Since iOS4, developers have the ability to perform background tasks with some limitations. Background tasks must fit one of the five different categories for background supported apps. Music and streaming apps can be backgrounded as long as they play music. Newsstand apps can wake once a day to download updates. Location aware apps can wake up once in a while to update their position. VOIP apps can have one socket (I found out the hard way that the one socket does not include listener sockets) connected in the background. General apps can request up to 10 minutes to finish some task. While this is enough for most backgrounding purposes, sometimes we need backgrounding for more advanced tasks. Specifically, I wanted to write a HTTP proxy server that runs on the device (in the future, this proxy server will work as an ad-blocking proxy) in the background. I will show you the steps of making this work. Please note that Apple will certainly reject any app that abuses their backgrounding policy so doing so would only be useful for personal and enterprise uses. Continue reading