介紹

web.ctx 是一個建基於 threadeddict class 的 code 來, 它是 thread-safe 的.

web.ctx holds variables for each request that contain specific information

成員

• env

A dictionary containing the standard WSGI environment variables (HTTP_ Variables)

Header

X-Forwarded-For

會變成

HTTP_X_FORWARDED_FOR

• home                   http://example.org/admin
• method                GET / POST
• homedomain        protocol + host
• protocol               http / https
• host                     example.org:8080
• ip                        xxx.xxx.xxx.xxx
  -----------------------------------------------------------
• path                    the path requested by the user, relative to the current application
• query                  (?fourlegs=good&twolegs=bad)
• fullpath                path + query

Example

Example1:

client_ip = web.ctx.ip

Example2:

referer = web.ctx.env.get('HTTP_REFERER', 'http://google.com')

This code uses web.ctx.env to access the HTTP_REFERER environment variable. If there isn't one, it defaults to google.com.

寫東西進 web.ctx

web.ctx can be set by a loadhoo()

function loadhook(h)

Converts a load hook into an application processor.

>>> app = auto_application()
>>> def f(): "something done before handling request"
...
>>> app.add_processor(loadhook(f))

應用例子: 寫 session 進去

In its default behavior, session information can only be shared from within the main application(app.py),

even if you 'import' the session from other modules.

app.py

session = web.session.Session(app, web.session.DiskStore('sessions'),
initializer = {'test': 'woot', 'foo':''})

def session_hook():
    web.ctx.session = session

app.add_processor(web.loadhook(session_hook))

sub-app.py

print web.ctx.session.test
web.ctx.session.foo = 'bar'