Django snippets: Accept Header Middleware

Accept Header Middleware

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

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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.

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

Tools

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. :-)