Access to a WLAN-Client (Web-Server) in RaspAP-WLAN via Eth0

[rk-sTEk]

I want to connect from my eth-Network to a little Web-Server running on a WLAN-Client.
I can ping the client from my eth-Network, but nothing happens when I try to get the HTTP-Connection via browser.
With another WLAN-client in the RaspAP-WLAN everything works. And a connection from WLAN clients to Eth-clients or the internet (http, https, ntp) works, too.

I don't want to work as bridged AP, because I need a different subnet.

Are there still iptable-entries or anything else to make?

eth: 10.0.1.0/24 ; Gateway 10.0.1.250
wlan: 10.0.2.0/24 ; Gateway is RaspAp

WLAN-Client: 10.0.2.150
Raspi: eth - 10.0.1.42 | wlan - 10.0.2.250
Eth-Client: 10.0.1.23

Ethernet with Router and static route: 10.0.2.0/24 - Gateway 10.0.1.42

ping from Eth-Client to the WLAN-client ... works
http from Eth-Client to the WLAN-client in browser ... no response