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A web micro-framework

Project description

Fresco, a web micro-framework for Python

  • Simple, powerful URL routing, request and response objects.
  • Lightweight and open to integration: you pick the templating and database libraries you want.
  • WSGI compliant: easy integration with your choice of web server, apps and middleware.

A minimal fresco web application:

from fresco import FrescoApp, GET, Response

def helloworld():
    return Response(["<h1>Hello World!</h1>"])

app = FrescoApp()
app.route('/', GET, helloworld)

Read the fresco documentation or visit the bitbucket repo for more info.



  • Request.cookies now maps names to values (not cookie objects), simplifying cookie handling and bringing us in line with how most other frameworks treat cookies. This change breaks backwards compatibility.
  • The maxage and http_only arguments to Cookie.__init__ and Response.add_cookie have been renamed to max_age and httponly respectively, reflecting the spelling used in the Set-Cookie header (‘Max-Age’ and ‘HttpOnly’). This change breaks backwards compatibility.
  • Changed FrescoApp’s constructor to have the same signature as RouteCollection. You can get the old behavior by using the views and path keyword arguments. This change breaks backwards compatibility.
  • Removed blinker dependency and associated signals. These were never documented and the application hooks added in this version provide a more flexible replacement. This change breaks backwards compatibility.
  • Removed the deprecated url method added to view functions This change breaks backwards compatibility.


  • Added request.is_secure property.
  • Added filters keyword argument to Route.
  • Calling Response() with no arguments now creates a 204 No Content response.
  • Calling Response('some string') no longer causes the string to be output byte-by-byte.
  • Added Response.add_vary method.
  • Response cookies have had the Version attribute removed, bringing them in line with RFC6265.
  • Added hooks to FrescoApp: process_request, process_response, process_view, process_exception, process_http_error_response, and finish_request.
  • Deprecated blinker signals in FrescoApp. FrescoApp.route_matched, FrescoApp.view_finished and FrescoApp.before_response should be replaced by the equivalent appliation hooks (process_request, process_view and process_response respectively).


  • Bugfix for FrescoApp.requestcontext_put and FrescoApp.requestcontext_patch which were raising a TypeError


  • Added FrescoApp.requestcontext_post, FrescoApp.requestcontext_put, FrescoApp.requestcontext_patch and FrescoApp.requestcontext_delete, to simplify direct testing of view functions.
  • Added a flag to disable middleware processing in requestcontext, eg FrescoApp.requestcontext(middleware=False). For middleware heavy stacks this may be used to speed up testing of individual views.


  • Added request.body and request.body_bytes properties
  • Added a request.get_json method to access JSON request payloads
  • Deprecated view_function.url()
  • Added RouteCollection.remove and RouteCollection.replace methods, making it easier to extend and modify RouteCollections.


  • Invalid character data in the request body no longer causes an exception.


  • fresco.decorators.extract_* methods are now deprecated in favour of the functions in fresco.routeargs
  • Fixed an error in RouteArg when using a conversion function and a value is not supplied
  • Added fresco.decorators.json_response
  • Added support for python 3.4 and dropped support for python 3.2


  • A new routearg function allows RouteArgs to be constructed dynamically
  • Renamed Route.decorate to Route.wrap
  • Added Route.filter to pipe the output of the view through a custom filter function


  • Bugfix for RouteArg when using a default value
  • Bugfix for urlfor when using positional arguments.
  • Added decorate method for Route objects.
  • Added fresco.routing.register_converter class decorator for simpler registration of routing pattern converters.
  • Added fresco.util.common.object_or_404.
  • Bugfix: fresco.util.urls.make_query no longer sorts key value pairs into alphabetical order, but preserves the original ordering.
  • fresco.static.serve_static_file now checks for certain malformed requests and returns an HTTP bad request status


  • Improved startup time for apps with lots of middleware

  • fresco.context no longer copies values from the parent when setting up a new request context. This makes it easier for libraries using fresco.context to cache resources per-request.

  • Bugfix for FrescoApp.requestcontext, which was creating duplicate context frames.

  • FrescoApp.view_finished signal now passes the request object to subscribers

  • Route objects can now take a tuple of positional args to pass to views:

    Route(POST, '/contact', args=('',))
  • The route class used by RouteCollection is now configurable, allowing apps to define custom routing classes.

  • fresco.routearg.RouteKwarg has been renamed to RouteArg and now works for positional arguments via Route(..., args=...)

  • Request.make_url now accepts two new optional arguments, query_add and query_replace. This facilitates building urls based on the current query string with selected values added or replaced.

  • Bugfix: improperly encoded paths now cause a 400 bad response to be returned rather than raising UnicodeDecodeError


  • FrescoApp.requestcontext() now invokes all registered middleware. This can be useful for testing views that rely on middleware to set environ keys or provide other services
  • RouteArg classes have been expanded and are now in a separate module, fresco.routeargs


  • Bugfix: Request.form was not handling unicode data in GET requests correctly
  • fresco.core.request_class has been moved to FrescoApp.request_class
  • Route arguments can take default arguments for url generation
  • Added tox for testing: fresco is now tested and works with Python 2.6, 2.7, 3.2 and 3.3


  • Bugfix: Request.make_url was double quoting URLs in some circumstances


  • Improved handling for ResponseExceptions raised during route traversal


  • Bugfix: routing arguments were being incorrectly converted to bytestrings in python2
  • Bugfix: urlfor works correctly with dynamic routes


Note that upgrading to this version will require changes to your application

  • View functions are no longer passed a request object as a positional argument
  • The syntax used to reference views by name has changed from urlfor('mymodule:view') to urlfor('mymodule.view').
  • Routing: named routes are now supported, eg Route('/', GET, myview, name='homepage'). These can later be accessed by eg urlfor('homepage'). The old route tagging facility has been removed.
  • Routing: Support for delegating paths to other routeable objects
  • fresco.exceptions.NotFoundFinal has been replaced by NotFound(final=True)
  • Experimental Python 3 support


  • Bugfix: setting the logger property on a FrescoApp no longer causes errors


  • FrescoApp objects now have an options dictionary for application level settings
  • Added serve_static_file function
  • Added support for signals with blinker
  • urlfor now requires fully qualified module names if called with a string argument


  • Bug: URL generation broken when HTTP_HOST does not contain port number


  • Bugfixes for beaker session support and broken URL generation when ‘X-Forwarded-SSL: off’ header supplied


  • Removed dependency on Pesto

0.1 (unreleased)

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