wsgi_extract.py

# standard wsgi middleware
def some_wsgi_middleware(app):
    def middleware(environ, start_response)
    
        def custom_start_response(status, headers, exc_info):
            # they get overwritten here from func args
            custom_start_response._status = status
            custom_start_response._headers = headers
    
        response = app(environ, custom_start_response)
        
        status = getattr(custom_start_response, '_status', '')
        headers = getattr(custom_start_response, '_headers', {})
        if status == '404':
            start_response('200', [])
            return 'something something'
        else:
            start_response(status, headers)
            return response
    return middleware