How to use the cornice.cors function in cornice

def reapply_cors(request, response):
    """Reapply cors headers to the new response with regards to the request.

    We need to re-apply the CORS checks done by Cornice, in case we're
    recreating the response from scratch.

    """
    service = request.current_service
    if service:
        request.info['cors_checked'] = False
        cors.apply_cors_post_request(service, request, response)
        response = cors.ensure_origin(service, request, response)
    else:
        # No existing service is concerned, and Cornice is not implied.
        origin = request.headers.get('Origin')
        if origin:
            settings = request.registry.settings
            allowed_origins = set(aslist(settings['cors_origins']))
            required_origins = {'*', decode_header(origin)}
            if allowed_origins.intersection(required_origins):
                origin = encode_header(origin)
                response.headers['Access-Control-Allow-Origin'] = origin

        # Import service here because kinto.core import utils
        from kinto.core import Service
        if Service.default_cors_headers:
            headers = ','.join(Service.default_cors_headers)

def reapply_cors(request, response):
    """Reapply cors headers to the new response with regards to the request.

    We need to re-apply the CORS checks done by Cornice, in case we're
    recreating the response from scratch.

    """
    service = request.current_service
    if service:
        request.info["cors_checked"] = False
        cors.apply_cors_post_request(service, request, response)
        response = cors.ensure_origin(service, request, response)
    else:
        # No existing service is concerned, and Cornice is not implied.
        origin = request.headers.get("Origin")
        if origin:
            settings = request.registry.settings
            allowed_origins = set(aslist(settings["cors_origins"]))
            required_origins = {"*", origin}
            if allowed_origins.intersection(required_origins):
                response.headers["Access-Control-Allow-Origin"] = origin

        # Import service here because kinto.core import utils
        from kinto.core import Service

        if Service.default_cors_headers:  # pragma: no branch
            headers = ",".join(Service.default_cors_headers)

def reapply_cors(request, response):
    """Reapply cors headers to the new response with regards to the request.

    We need to re-apply the CORS checks done by Cornice, in case we're
    recreating the response from scratch.

    """
    service = request.current_service
    if service:
        request.info["cors_checked"] = False
        cors.apply_cors_post_request(service, request, response)
        response = cors.ensure_origin(service, request, response)
    else:
        # No existing service is concerned, and Cornice is not implied.
        origin = request.headers.get("Origin")
        if origin:
            settings = request.registry.settings
            allowed_origins = set(aslist(settings["cors_origins"]))
            required_origins = {"*", origin}
            if allowed_origins.intersection(required_origins):
                response.headers["Access-Control-Allow-Origin"] = origin

        # Import service here because kinto.core import utils
        from kinto.core import Service

        if Service.default_cors_headers:  # pragma: no branch
            headers = ",".join(Service.default_cors_headers)
            response.headers["Access-Control-Expose-Headers"] = headers

def reapply_cors(request, response):
    """Reapply cors headers to the new response with regards to the request.

    We need to re-apply the CORS checks done by Cornice, in case we're
    recreating the response from scratch.

    """
    if request.matched_route:
        services = request.registry.cornice_services
        pattern = request.matched_route.pattern
        service = services.get(pattern, None)

        request.info['cors_checked'] = False
        response = cors.ensure_origin(service, request, response)
    return response

def reapply_cors(request, response):
    """Reapply cors headers to the new response with regards to the request.

    We need to re-apply the CORS checks done by Cornice, in case we're
    recreating the response from scratch.

    """
    service = request.current_service
    if service:
        request.info['cors_checked'] = False
        cors.apply_cors_post_request(service, request, response)
        response = cors.ensure_origin(service, request, response)
    else:
        # No existing service is concerned, and Cornice is not implied.
        origin = request.headers.get('Origin')
        if origin:
            settings = request.registry.settings
            allowed_origins = set(aslist(settings['cors_origins']))
            required_origins = {'*', decode_header(origin)}
            if allowed_origins.intersection(required_origins):
                origin = encode_header(origin)
                response.headers['Access-Control-Allow-Origin'] = origin

        # Import service here because kinto.core import utils
        from kinto.core import Service
        if Service.default_cors_headers:
            headers = ','.join(Service.default_cors_headers)
            response.headers['Access-Control-Expose-Headers'] = headers