Reading all data coming to my web browser

How can I read all data (low level data, encrypted data, etc.) coming to my web-browser? The data can be from different servers. Further I want to parse these data 开发者_运维技巧so it should be in some format. I just want to know the structure of data and how can I read and parse it (in "C" or "Java" languages). It is related to browser development.

Sounds like you could have a look at wireshark. Very nice program to find out about network data; and you can specify filters so it's not too hard to filter out everything going to a browser.

The HTTP specification tells you the "structure" of the data.

For intercepting it, you might be able to write a browser plugin (see, for example, FireBug). Otherwise, your best bet is with a local proxy that you configure your browser to talk to.

Or a network sniffing tool like tcpdump or wireshark.