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Monday, June 21, 2010

proxy server with filtering feature

Beside exploring San Diego, I had done some coding intermittently only. My apology if I do not update X2 with fresh new examples often enough.

Having said that, here is one network-related example: a minor tweak to the previous example of Qt-based proxy server. Basically it adds a minimalistic URL filtering support, in the form of blacklisting certain URLs which start with some predefined strings. The code is available in the usual place, X2 repository, under the directory network/filterproxy.

While major browsers support some variants of content blocking, be it via an extension like AdBlock or as a feature built-in into the browser itself, this new filterproxy should work with any browser that supports proxy. Alas, I did not bother to implement an AdBlock-compatible rule system because it would complicate the code. Again, consider this is a proof of concept only. A challenging exercise would be to fully support the most known subscription filters.

It is unheard that content filtering can dramatically improve your browsing experience. Because it cuts the bandwidth usage, it does translate to lower cost for those who are not lucky enough to get unlimited data plan. But most importantly, throwing garbage out of the web pages definitely speeds up the page loading. For this filterproxy example, I did a very unscientific benchmark and test it with news site (now you get the answer why the included blacklist.txt contains only some basic advertisement-laden sites). The screenshots below (click to enlarge) show the unfiltered version (left) and the filtered version (right). Notice also the whopping 40% of bandwith saving!

My promise was to post two variations from that simple proxy example. This counts as one of them, and when the time allows me to clean-up to the other, you'll know it. Stay tuned and happy proxying!

spring-to-summer: photo blog

Since I've not been blogging for a while, let me do a post on some pictures (plus the stories) instead.

On a weekend, Balboa Park is a very nice attraction. Rather than explaining it in details, I suggest to just drop the park a visit. Beside a lot of different types of museum, there is also this Japanese Friendship Garden. A small cafe there, the Tea Pavillion, is a very nice place to relax and enjoy the surrounding. They serve sencha and other types of tea. Hungry? Get a rice bowl:

rice bowl

If you are more a beach person instead, then there is a plenty of choices, for example Silver Strand Beach. It is rather small, but it is always a nice spot to enjoy the sunset.

silhouette @ sunset

When I was at Google IO, I took some pictures of the large overhang banners because I wanted to test the 8 megapixel camera of HTC EVO 4G that Google gave away (see more in the complete set):


Getting a fantastic gift for the Father's day? Thinking of something for the next Mother's Day? What about a beautiful pendant (get one from LuShae Jewelry) like what my other better half elegantly captured below?