topics = other half of web and http
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| are notion of multi-step exchanges of HTTP messages to complete a web transaction needed | show 🗑
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| what is not needed for a server or client to track in a multi-step exchange | show 🗑
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| show | independent
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| show | recover
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| what do websites and client browsers use to maintain some state between transactions | show 🗑
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| what are the four main components of a cookie | show 🗑
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| show | authorization / shopping carts / recommendations / user session state (web email)
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| show | protocol endpoints, help in maintain state at sender and receiver over multiple transactions / cookies, HTTP messages carry state
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| show | cookies permit sites to learn a lot about you on their site / third party persistent cookies allow common identity to be tracked across multiple websites
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| show | satisfy client request without involving origin server
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| how does web caches work | show 🗑
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| what happens when an object is in cache | show 🗑
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| if object in cache isn't returned. what happens | show 🗑
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| does web cache act as a client or a server | show 🗑
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| show | server for original requesting client / client to origin server
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| how is web cache installed | show 🗑
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| show | reduced response time for client request (because cache is closer to client) / reduced traffic on an institutions access link / internet is dense with caches (enables poor content providers to more effectively deliver content)
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| show | practice it eventually
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| show | don't send object if cache has up to date cached version (no object transmission delay / lower link utilization)
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| show | if-modified-since:<date>
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| what does a server do if cached copy is up to date | show 🗑
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| show | decreased delay in multi-object HTTP requests
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| what did HTTP1.1 introduce | show 🗑
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| how does the HTTP1.1 server work | show 🗑
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| show | head-of-line
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| show | it retransmits lost TCP which in turn stalls other object transmission
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| show | increased flexibility at server in sending objects to client
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| show | no
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| what method is used to transmit requests in HTTP/2 | show 🗑
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| show | yes
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| show | divide objects into frames and schedule the frames into mitigate
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| show | recovery from packet loss still stalls all object transmissions / opposite to HTTP1.1 browsers open multiple parallel TCP connections to reduce stalling and increase overall throughput
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| what type of security does HTTP/2 to HTTP/3 have | show 🗑
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| what does HTTP/3 add to HTTP/2 | show 🗑
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| next section = email / SMTP / IMAP | show 🗑
|
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