Forum OpenACS Development: Re: XML-RPC String limit
What we know now is that for whatever reason, an xml-rpc request with 100k size ends up as an empty string in xmlrpc::invoke. This means, that xmlrpc::get_content (called by the www/index.tcl returns empty). I would recommend to try to replace the body of xmlrpc::get_content by the single line (when you use NaviServer):
return [ns_getcontent -as_file false -binary false]
Let's hope this helps.