fetching layer 7 samples with tcp mode frontend

[Dmitry Sivachenko]

Hello!

Consider the following config excerpt:

frontend test-fe
    mode tcp
    use_backend test-be1 if { path -i -m end /set }

What is the notion of "path" sample at frontend working in TCP mode?

We experimented with haproxy-1.5.18 on Linux sending HTTP queries with path 
ending with "/set" and found that this condition sometimes hit, sometimes not.  
So the behaviour is random.

Is it expected?  At the first glance, I'd expect a warning or even an error 
when parsing such a config.
What am I missing?

Thanks.