def post(self, slug):
    print self.request

OST /first/person/ HTTP/1.0 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 Accept-Language: en-US,en;q=0.8 Cache-Control: max-age=0 Connection: keep-alive Content-Length: 43 Content-Type: application/x-www-form-urlencoded Content_Length: 43 Content_Type: application/x-www-form-urlencoded Cookie: djdt=hide; csrftoken=09f29b2bfe9f51f16581bab7fe7c6f38; sessionid=49b995d954eae8d613cedc3f4e92a796 Host: 127.0.0.1:8080 Origin: http://127.0.0.1:8080 Referer: http://127.0.0.1:8080/person/1/

referer = self.request.headers['Referer']
            print referer

False Status: 200 Content-Type: text/html; charset=utf-8 Content-Length: 0 Cache-Control: no-cache

webapp2.redirect(self.request.referer)

def get(self):
    self.response.headers.add_header('Set-Cookie', 'referer=%s; Path=/' % self.request.referer)
    # render your html
def post(self):
    # your logic here
    referer = str(self.request.cookies.get('referer'))
    self.redirect(referer)