httpfs depends on FUSE. Therefore it's important to have a working FUSE.
First you need the device, which root can build as follows:
mknod /dev/fuse c 10 229 chmod 666 /dev/fuse(That is hopefully already done by installation of FUSE.)
The properties must show up like this:
You have also to assure, that an unprivileged user can mount with fusermount:
chmod 4755 fusermount(This should also be unnecessary, if FUSE was proper installed.)
Since fusermount is called by httpfs (you don't call it yourself), it must be accessible in PATH.
Furthermore httpfs — actually FUSE — needs libfuse.so and a kernel module fuse.o on 2.4.x-kernels (Kernel 2.6.14 and up have build-in Fuse-support).
insmod fuse.oallows root to install it.
For your convenience — you need kernel headers to compile it yourself — you can download fuse.o(2.4.27) here. For kernel 2.4.26 you can visit http://www.damnsmalllinux.org.