Login

Accept Header Middleware

Author:
kioopi
Posted:
April 16, 2008
Language:
Python
Version:
.96
Tags:
middleware request accept
Score:
1 (after 1 ratings)

A middleware that parses the HTTP_ACCEPT header of a request.

The request gets a new method called "accepts" that takes a string and returns True if it was in the list of accepted mime-types.

It makes it possible to write views like:

def exampleview(request):
    if request.accepts('application/json'):
        # return a json representation

    if request.accepts('text/html'): 
        # return html

Please note that with this middleware the view defines the priority of the mime-types, not the order in which they where provided in the HTTP-Header.

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
import new

def accepts( self, mime ):
    return mime in self.accepted_types

class AcceptMiddleware(object):
    def process_request(self, request):
        acc = [a.split(';')[0] for a in request.META['HTTP_ACCEPT'].split(',')]
        setattr(request, 'accepted_types', acc )
        request.accepts = new.instancemethod(accepts, request, request.__class__)
        return None

More like this

  1. XhtmlDegraderMiddleware by dmh 7 years, 9 months ago
  2. Render Decorator by dahool 5 years, 8 months ago
  3. Other approach of making middleware (by decorators) by diverman 4 years, 2 months ago
  4. Improved Accept header middleware by ludvig.ericson 6 years, 8 months ago
  5. Decorator that limits request methods by schinckel 5 years, 10 months ago

Comments

ludvig.ericson (on September 10, 2008):

I'd say the new.instancemethod trickery is indeed uncalled for:

request.accepts = lambda type: type in acc

Not to mention the list comprehension. :-)

#

Please login first before commenting.