HTTP and TCP Carey Williamson Department of Computer Science

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Presentation transcript:

HTTP and TCP Carey Williamson Department of Computer Science University of Calgary Winter 2018

Network View: HTTP and TCP TCP is a connection-oriented protocol SYN SYN/ACK ACK GET URL YOUR DATA HERE Web Server Web Client FIN FIN/ACK ACK

Example Web Page Harry Potter Movies As you all know, the new HP book will be out in June and then there will be a new movie shortly after that… “Harry Potter and the Bathtub Ring” hpface.jpg page.html castle.gif

C S TCP SYN TCP FIN page.html G The “classic” approach in HTTP/1.0 is to use one HTTP request per TCP connection, serially. TCP SYN TCP FIN hpface.jpg G TCP SYN TCP FIN castle.gif G

C S Concurrent (parallel) TCP connections can be used to make things faster. TCP SYN TCP FIN page.html G C S C S G hpface.jpg S F castle.gif G F S

C S TCP SYN page.html G The “persistent HTTP” approach can re-use the same TCP connection for Multiple HTTP transfers, one after another, serially. Amortizes TCP overhead, but maintains TCP state longer at server. hpface.jpg G castle.gif G TCP FIN Timeout

C S TCP SYN page.html G The “pipelining” feature in HTTP/1.1 allows requests to be issued asynchronously on a persistent connection. Requests must be processed in proper order. Can do clever packaging. GG hpface.jpg castle.gif TCP FIN Timeout

The major application on the Internet Client/server model: Summary of Web and HTTP The major application on the Internet Majority of traffic is HTTP (or HTTP-related) Client/server model: Clients make requests, servers respond to them Done mostly in ASCII text (helps debugging!) Various headers and commands Too many to go into detail here Many web books/tutorials exist (e.g., Krishnamurthy & Rexford 2001)