Adding support for http proxy will be a good new feature of Wikit.
I take autoproxy module from tcllib 1.7 (with dependencies: base64, uri, uri/urn-scheme)
and replace
package require http
in files lib/wikit/image.tcl and lib/wikit/db.tcl with
package require http
package require autoproxy
autoproxy::init
Diff file includes packages from tcllib 1.7, so it is not small (~54K)

Thanks! I've applied your changes. This is an excellent step forward IMO.