Client connection kept open longer than it should after forwarding response

[thc202]

The client side connection is kept open after forwarding a response without Content-Length making the client waiting for more data when there is none (and ZAP waiting for a new request), eventually ZAP times out and closes the connection.

From: https://groups.google.com/g/zaproxy-users/c/xmTsLCOLSvQ/m/ZAC_A_I2DAAJ

Happens in ZAP 2.11.x and weeklies.