How come the same response for a request comes up when it should be different?

data = {'doSearch': "Search"        }user_agent = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.3 Safari/605.1.1'cookies = {'ArtId': '*************'}headers = {'User-Agent': user_agent,'Cache-Control': 'no-cache, no-store, must-revalidate','Pragma': 'no-cache','Expires': '0'}def get_classes(src, dest):    unique_identifier = int(time.time())  # Unique timestamp    query = f'{src}+{dest}&ts={unique_identifier}'  # Append to make request unique    url = f'https://njtransfer.org/artweb/listeqs.cgi?{query}'    print(query)    r = requests.post(url, data=data, headers=headers, cookies=cookies)    return r.text

When I make a call to get_classes, I get the same response as one of the previous calls I made to get_classes function. For example, https://njtransfer.org/artweb/listeqs.cgi?AT+BS would have the same response as https://njtransfer.org/artweb/listeqs.cgi?OC+EN. All subsequent requests are a copy of one of the previous requests. I am not sure if this a caching issue. I added a header to prevent caching and a unique identifier just in case, but it doesn't fix issue.

I am expecting a different response for each different combination of parameters in the url post request. Instead I am getting the same one. Yet when I enter the different urls in the browser, I am getting different responses unlike my program.