Bottle Py: Enabling CORS for jQuery AJAX requests

Question

I\'m working on a RESTful API of a web service on the Bottle Web Framework and want to access the resources with jQuery AJAX calls.

Using a REST client, the resource

Answer 1

Here's a minor improvement on @ron.rothman's method #2 for installing the CORS handler globally. His method requires you to specify that the OPTIONS method is accepted on every route you declare. This solution installs a global handler for all OPTIONS requests.

@bottle.route('/<:re:.*>', method='OPTIONS')
def enable_cors_generic_route():
    """
    This route takes priority over all others. So any request with an OPTIONS
    method will be handled by this function.

    See: https://github.com/bottlepy/bottle/issues/402

    NOTE: This means we won't 404 any invalid path that is an OPTIONS request.
    """
    add_cors_headers()

@bottle.hook('after_request')
def enable_cors_after_request_hook():
    """
    This executes after every route. We use it to attach CORS headers when
    applicable.
    """
    add_cors_headers()

def add_cors_headers():
    if SOME_CONDITION:  # You don't have to gate this
        bottle.response.headers['Access-Control-Allow-Origin'] = '*'
        bottle.response.headers['Access-Control-Allow-Methods'] = \
            'GET, POST, PUT, OPTIONS'
        bottle.response.headers['Access-Control-Allow-Headers'] = \
            'Origin, Accept, Content-Type, X-Requested-With, X-CSRF-Token'

```