FastHTTPUser determines StatusCode 304 as Failed

[nichero-h]

Prerequisites

• I am using the latest version of Locust
• I am reporting a bug, not asking a question

Description

The status code is less than 400, but it is Failed.
Run the same scenario with HttpUser, 304 will not be treated as an error.

$ locust -f test.py --headless -u 1 -r 1 --run-time 1s
...
Error report
# occurrences      Error                                                                                               
------------------|-------------------------------------------------------------------------------------------------------------------------------------------
18                 GET /en/stable/_static/css/theme.css: BadStatusCode('https://docs.locust.io/en/stable/_static/css/theme.css', code=304)
------------------|-------------------------------------------------------------------------------------------------------------------------------------------

Command line

locust -f test.py --headless -u 1 -r 1 --run-time 1s

Locustfile contents

from locust import FastHttpUser, task


class SampleScenario(FastHttpUser):
    host = "https://docs.locust.io"
    default_headers = {
        "Accept-Encoding": "gzip, deflate, br",
        "Accept-Language": "ja",
        "Connection": "keep-alive",
        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36 Edg/119.0.0.0",
        "sec-ch-ua": '"Microsoft Edge";v="119", "Chromium";v="119", "Not?A_Brand";v="24"',
        "sec-ch-ua-mobile": "?0",
        "sec-ch-ua-platform": '"Windows"',
    }

    @task
    def task_01(self):
        with self.client.get(
            url="/en/stable/_static/css/theme.css",
            headers={
                "Accept": "text/css,*/*;q=0.1",
                "If-Modified-Since": "Thu, 05 Oct 2023 21:35:33 GMT",
                "If-None-Match": 'W/"f14328d9217f8a6517a2c91eaca7764a"',
                "Referer": "https://docs.locust.io/en/stable/quickstart.html",
                "Sec-Fetch-Dest": "style",
                "Sec-Fetch-Mode": "no-cors",
                "Sec-Fetch-Site": "same-origin",
            },
            catch_response=True,
        ) as resp:
            pass

Python version

3.9.18

Locust version

2.19.1

Operating system

Rocky Linux 9