本文探讨了在iOS项目中使用System.Net.WebRequest遇到NotSupportedException的问题。由于Unity主要支持WWW请求方式，作者提出了一些替代方案，包括使用System.Net和TCP Socket自行实现HTTP请求，或者通过原生代码插件使用NSURLRequest。
问：
Using System.Net.WebRequest on an iOS project results in a NotSupportedException.
Why is this? This is really crippling from my point of view, and really limits what can be done with web services within a Unity game.
Please don't tell me to use WWW, I can't even read a HTTP status code that, or set headers...
Is there a way around this, or am I going to be forced to write my own WebRequest class?
答1：
Okey so I'm not telling you to use WWW, you can always use System.Net and TCPSockets to pull it off yourself. The HTTP protocol is extremely easy actually.
Alternatively a native code plugin to NSURLRequest allows you to do it too.
As for WWW:
WWW uses the native NSURLRequest on iOS, the best and most stable form of request you can do.
.Net.WebRequests are basically nowhere supported by Unity (aside of perhaps standalone win / osx) as it focuses its usage on WWW which complies to the limitations of the various platforms (aot on iOS, security sandbox on webplayer etc), a thing that is not the case for WebRequests.
答2：
OK. Here is one laptop-battery-charge worth of coding. It still has a way to go, but it is starting to work.
http://code.google.com/p/unityweb/source/checkout
This project provides a replacement HTTP.Request class for Unity3D, based on System.Net.TcpClient, using Asynchronous IO.
TODO: Add proxy support, Gzip decompression, documentation and examples.
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