FastHttpUser is stricter than HttpUser about the host attribute

[pjenvey]

Prerequisites

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

Description

As a followup to #1222:

FastHttpUser has differences from HttpUser but is documented as a simple drop-in replacement for most cases. The fix for #1222 (#1227) was intended to relax FastHttpUser's host checking to be in line with HttpUser's however there's still a major difference between them: HttpUser doesn't validate the host url format, only ensuring it's not None:

https://github.com/locustio/locust/blob/68ffae8/locust/user/users.py#L252

I don't think there's a compelling reason for these types to differ in their host checks.

I'm using locust against a websocket service where it also uses the FastHttpUser client: in our case we would ideally use host to point to a websocket url but FastHttpUser's stricter check disallows this whereas HttpUser would.

So I think the stricter checking should be removed entirely to bring them into parity.

Command line

locust -f locustfiles/locustfile.py --websocket_url ws://localhost:9150

Locustfile contents

.

Python version

3.10

Locust version

2.19.1

Operating system

Linux