Locust webui is not overriding the default values if any defaults are provided (Locust 2.43.0 / Python 3.14.2)

[jkhouw]

I'm new to both Python and Locust so I could be doing something wrong but if I define custom parameters like this:

@events.init_command_line_parser.add_listener
def _(parser):
    parser.add_argument("--udv-var1", type=str, default="defaultValue",help="Variable 1")
    parser.add_argument("--udv-var2", type=str, default=None, help="Variable 2")  

Then try to get the values like this

@events.test_start.add_listener
def _(environment, **kw):
    print(f"Custom argument supplied: {environment.parsed_options.udv_var1}")
    print(f"Custom argument supplied: {environment.parsed_options.udv_var2}")

If i change the values on the webui between runs,
udv_var1 will ALWAYS be "defaultValue" no matter what I change it to on the webui.
udv_var2 is changeable and will take whatever value I set in the webUI

But that means I can't provide the user/test with default values. Am I doing something wrong?

[jkhouw]

Edit - i thought someone pointed me in the right direction, because by removing the hyphen it worked. Until it didn't. Completely random.

I guess the webUI just can't be relied on to change custom arguments.