Great Set of Sequence Diagrams Explaining HTTP over TCP/IP

eventhelix.com

72 points·sh1mmer··8 comments

The diagrams are informative and makes me appreciate the fact that I don't usually need to worry about UDP and TCP/IP low level things anymore (different in the 1980s, at least for the work I did back then).

BTW, a comment on UML sequence diagrams: I used to be a proponent of UML (Paul Harmon and I wrote a UML book together in ancient history) but sequence diagrams are the only type of UML diagram that I use anymore in my work: the most bang for the buck, communication wise.

i was expecting something about the tcp/ip illustrated volumes. i wish more people would read those.

I was looking for something on TCP/IP and this was the best I could find online:

a) with diagrams b) that weren't ascii

b) that weren't ascii

On the other hand PDF's don't let you extract structured information without effectively reverse OCR'ing it.

For example Alan Kay's Steps Toward the Reinvention of Programming project generates it's TCP/IP stack from the ascii art in RFC 791:

http://www.moserware.com/2008/04/towards-moores-law-software...

Header diagrams work just fine in ascii sequence diagrams, not so much.

They could release the original file formats in addition to the pdf. This is like a picture of a thing; it seems like you could get at it but you can't.

Also, after you said that I checked and they are on Safaribooks online :) http://search.safaribooksonline.com/0201633469

The web caching diagrams were super informative.

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