Hi Richard,
I have one customer using an old 3524XL running c3500xl-c3h2s-mz.120-5.WC17.bin. This IOS does have the no ip http server that is included in more modern switches; after applying the command it did turn off the web server. What IOS are you running? Here is the output for this switch:
CCT-3524XL#show ver
Cisco Internetwork Operating System Software
IOS (tm) C3500XL Software (C3500XL-C3H2S-M), Version 12.0(5)WC17, RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2007 by cisco Systems, Inc.
Compiled Tue 13-Feb-07 15:04 by antonino
Image text-base: 0x00003000, data-base: 0x00352924
ROM: Bootstrap program is C3500XL boot loader
CCT-3524XL uptime is 39 weeks, 2 days, 1 hour, 52 minutes
System returned to ROM by power-on
System restarted at 15:59:08 EDT Tue Jun 17 2014
System image file is "flash:c3500xl-c3h2s-mz.120-5.WC17.bin"
cisco WS-C3524-XL (PowerPC403) processor (revision 0x01) with 8192K/1024K bytes of memory.
Processor board ID FAB0536V288, with hardware revision 0x00
Last reset from power-on
Processor is running Enterprise Edition Software
Cluster command switch capable
Cluster member switch capable
24 FastEthernet/IEEE 802.3 interface(s)
2 Gigabit Ethernet/IEEE 802.3 interface(s)
32K bytes of flash-simulated non-volatile configuration memory.
Base ethernet MAC Address: 00:07:50:CE:48:40
Motherboard assembly number: 73-3904-11
Power supply part number: 34-0851-02
Motherboard serial number: FAB05362F31
Power supply serial number: PHI052806L0
Model revision number: A0
Motherboard revision number: D0
Model number: WS-C3524-XL-EN
System serial number: FAB0536V288
Configuration register is 0xF
CCT-3524XL#conf t
Enter configuration commands, one per line. End with CNTL/Z.
CCT-3524XL(config)#ip http ?
access-class Restrict access by access-class
authentication Set http authentication method
path Set base path for HTML
port HTTP port
server Enable HTTP server
