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Yesterday, I have a discussion with my colleagues about HTTP. It is asked why HTTP is designed in plain text way. Surely, it can be designed in binary way just like TCP protocol, using flags to represents different kinds of method(POST, GET) and variables (HTTP headers). So, why HTTP is designed in such way? Is there any technical or historical reasons?
A reason that’s both technical and historical is that text protocols are almost always preferred in the Unix world.
Well, this is not really a reason but a pattern. The rationale behind this is that text protocols allows you to see what’s going on on the network by just dumping everything that goes through. You don’t need a specialized analyzer as you need for TCP/IP. This makes it easier to debug and easier to maintain.
Not only HTTP, but many protocols are text based (e.g., FTP, POP3, SMTP, IMAP).
You might want to take a look at The Art of Unix Programming for a much more detailed explanation of this Unix thing.