Feature Request: Add setMaxClients() to limit concurrent HTTP connections

[VladimirVecera]

Platform

ESP32

IDE / Tooling

Arduino (IDE/CLI)

What happened?

Feature Request: There is no way to limit concurrent HTTP connections.

On memory-constrained projects, rapid page navigation causes stack overflow
because too many connections are handled simultaneously.

I would like to request adding setMaxClients() method to AsyncWebServer class,
similar to how AsyncWebSocket has cleanupClients().

Stack Trace

Example crash when rapidly clicking through pages with CONFIG_ASYNC_TCP_STACK_SIZE=3200:

Guru Meditation Error: Core 0 panic'ed (Unhandled debug exception)
Debug exception reason: Stack canary watchpoint triggered (async_tcp)

Note: This is not a bug report - including stack trace only because field is required.
The crash is preventable by increasing stack size, but limiting max clients
would provide better memory control.

Minimal Reproductible Example (MRE)

...

I confirm that:

• I have read the documentation.
• I have searched for similar discussions.
• I have searched for similar issues.
• I have looked at the examples.
• I have upgraded to the lasted version of ESPAsyncWebServer (and AsyncTCP for ESP32).