1import os 2 3 4def application(env, start_response): 5 vars = env.get('HTTP_X_VARIABLES').split(',') 6 7 body = ','.join([str(os.environ[var]) for var in vars if var in os.environ]) 8 body = body.encode() 9 10 start_response('200', [('Content-Length', str(len(body)))]) 11 return body 12