Nearly everyone on the earth know that China has a Great Fire Wall to monitor and control connections abroad. It block some web pages that should not be seen by teenagers or have politic issues. But it blocks some useful webs too. For example, *.blogspot.com where holds many technical blogs, http://chrome.google.com/extensions where you can extent you Chromium... It's unbearable for someone(like me, although I tolerated it for quite a long time) got "Connection Reset" now and then. So I decided and managed to get through it with Gappproxy.
Why Gappproxy?
It based on GAE(Google App Engine), which is free(within quotas) and powerful and 7x24 on line. Someone may found GAE has been blocked too. I will talk on it later. There are many ways to break walls such as buy a VPS abroad and use ssh tunnel through it or use VPN. But neither I don't have the money and time to buy a VPS nor many free VPN sites are not accessible, I choose Gappproxy as my way to embrace the free world.
There are some tutorials that could teach you how to setup a Gappproxy for yourself, search it on baidu.com will give you many results. (I nearly never search sensitive topic on Google because it would bring it into trouble) So I won't reinvent the wheel. One thing I want to mention is the Gappproxy main site was blocked too(not surprisingly). So you could not retrieve the source files unless you pass the wall... Here is a link for the tarballs and you may find it accessible behind the wall:
http://gappproxy.googlecode.com/files/gappproxy-1.0.0beta.tar.gz
In this tarball, fetchserver folder have the files that should be deployed to GAE, which is equivalent to the fetchserver tarball in most tutorials; in localproxy folder there is the client need to be run on your box. Don't forget to adjust them before you deploy/run :-)
After it was fully setup, set your browser's proxy to localhost:8000. I prefer to use a pac file to do the trick.(See below) After got it run successfully, you may need to update your Gappproxy to the latest version.
Access to GAE
Actually it's quite easy to do the trick. Following this link http://ftofficer.spaces.live.com/blog/cns!423B72634E2F6B7E!1073.entry (which is also blocked, but you can search "appspot www.google.cn" in baidu.com. It will be the third entry. Take snapshot with baidu you can know what he/she is saying about, in Chinese), you can edit your /etc/hosts to let your appspot point to a www.google.cn's IP. Now your GAE will be accessible. I hope GFW won't block www.google.cn ;-)
Use a pac file to setup proxy for your web browser
The last blog I mentioned above have taught me how to use a pac file to set up proxy for web browser. Why use pac file?
- It's plain text file with JavaScript syntax. So it will be editable with any of your favorite text editor. I know nothing about JavaScript but a pac file is rather easy to write and understand and thus, easy to extend.
- It's flexible and powerful. You can set different proxies for different urls or hosts. You can even tell the browser to connect to the web directly for some urls.
- It's browser-independent. It's not a fancy Firefox plugin which could not run on Chromium. It's a standard which is supported by most of the browsers, Firefox, Chromium, Opera... Maybe if you find a browser which does not support it, you should not use that browser ;-) (I haven't tested it in IE though.. ;)
There are tutorials teaching you what a pac file is and how to write a pac file [Ref1], [Ref2] , so I won't reinvent the wheel again ;)
Let me use one sentence to finish this article:
Standing on the Cloud, where is the Wall?
| [Ref1] | http://en.wikipedia.org/wiki/Proxy_auto-config |
| [Ref2] | http://code.google.com/p/gappproxy/wiki/UsingProxy_StepByStep# _2._使用_PAC_文件，强大、智能 |
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