Content-Type with version information is not properly parsed

[andrew-potachits]

Prerequisites

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

Description

My app API uses versioning (Microsoft.AspNetCore.Mvc.Versioning) with version info in the media type Content-Type header).
Thus, the responses are like this:

Content-Type: application/json; charset=utf-8; api-version=3.0

however, the FastResponse.text doesn't expect that Content-Type can have anything else after the charset=utf-8; and uses the rest of the value as content encoding.

self.encoding = self.headers.get("content-type", "").partition("charset=")[2] or "utf-8"

Getting this error:

LookupError: unknown encoding: utf-8; api-version=3.0

[2023-10-06 19:37:47,444] Andrews-Mac-Studio.local/ERROR/locust.user.task: unknown encoding: utf-8; api-version=3.0
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.11/site-packages/locust/user/task.py", line 347, in run
    self.execute_next_task()
  File "/opt/homebrew/lib/python3.11/site-packages/locust/user/task.py", line 378, in execute_next_task
    self.execute_task(self._task_queue.pop(0))
  File "/opt/homebrew/lib/python3.11/site-packages/locust/user/task.py", line 499, in execute_task
    task(self.user)
  File "/Users/andrew/Dev/temp.py", line 10, in index
    with self.rest("POST",
  File "/opt/homebrew/Cellar/python@3.11/3.11.5/Frameworks/Python.framework/Versions/3.11/lib/python3.11/contextlib.py", line 137, in __enter__
    return next(self.gen)
           ^^^^^^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/locust/contrib/fasthttp.py", line 379, in rest
    if resp.text is None:
       ^^^^^^^^^
  File "/opt/homebrew/lib/python3.11/site-packages/locust/contrib/fasthttp.py", line 465, in text

Command line

locust -f temp.py --headless --host http://localhost:8888 -u 1 -r 1

Locustfile contents

from locust import FastHttpUser, between, task

class WebsiteUser(FastHttpUser):
    @task
    def index(self):
        with self.rest("POST", 
                       "/versioned-api") as res:
            pass
        self.stop()

Python version

Python 3.11.5

Locust version

locust 2.17.0 from /opt/homebrew/lib/python3.11/site-packages/locust (python 3.11.5)

Operating system

Mac OS 14.0 (23A344)