A Few Notes On HTTP

•

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A Few Notes On HTTP
It’s How The Web Works, Stupid!

Pierre Phaneuf <pphaneuf@gmail.com>

HTTP is core

Regular web browser

AJAX

XML-RPC, SOAP

WebDAV, CalDAV, Subversion

Atom Publishing Protocol

Caching

We all know HTTP caching is important, like
ﬂossing, and most of us leave it at that, like
ﬂossing —— David Heinemeier Hansson

Set the Expires header

Use 301 instead of 302 when applicable

But My Site Is Dynamic!

Set the Last-Modiﬁed header

Set the ETag header

But beware!

Frameworks are silly sometimes

Clustering (inode numbers)

Compression

It’s easy.

It’s good.

Keep Alive

Friend or Foe?

Memory usage on the server

A reverse-proxy can help

AJAX

Increased load on servers?

Decrease the load, if done right!

Fastest way to handle a request

Not handling it!

Content distribution network

A Golden Age

Static content

CGI dynamic content

In-process dynamic content (Apache, ISAPI)

Out-of-process dynamic content (FastCGI,
WSGI)

Tools

Firebug’s Net tab

How long it took

What is cached

Dependencies

Wireshark (and tcpdump)

Questions?
Thank you!

Pierre Phaneuf <pphaneuf@gmail.com>

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1. A Few Notes On HTTP It’s How The Web Works, Stupid! Pierre Phaneuf <pphaneuf@gmail.com>

2. HTTP is core Regular web browser AJAX XML-RPC, SOAP WebDAV, CalDAV, Subversion Atom Publishing Protocol

3. Caching We all know HTTP caching is important, like ﬂossing, and most of us leave it at that, like ﬂossing —— David Heinemeier Hansson Set the Expires header Use 301 instead of 302 when applicable

4. But My Site Is Dynamic! Set the Last-Modiﬁed header Set the ETag header But beware! Frameworks are silly sometimes Clustering (inode numbers)

5. Compression It’s easy. It’s good.

6. Keep Alive Friend or Foe? Memory usage on the server A reverse-proxy can help

7. AJAX Increased load on servers? Decrease the load, if done right!

8. Fastest way to handle a request Not handling it! Content distribution network

9. A Golden Age Static content CGI dynamic content In-process dynamic content (Apache, ISAPI) Out-of-process dynamic content (FastCGI, WSGI)

10. Tools Firebug’s Net tab How long it took What is cached Dependencies Wireshark (and tcpdump)

11. Questions? Thank you! Pierre Phaneuf <pphaneuf@gmail.com>