'Args:
filename: string, absolute filename to read response from
headers: dict, header to return with response'

def __init__(self, filename=None, headers=None):

    if (headers is None):
        headers = {'status': '200'}
    if filename:
        f = open(filename, 'rb')
        self.data = f.read()
        f.close()
    else:
        self.data = None
    self.response_headers = headers
    self.headers = None
    self.uri = None
    self.method = None
    self.body = None
    self.headers = None
