no connection to the server

    while executing
"my statementCreate Stmt::[incr statementSeq] [self] $sqlcode"
    (class "::tdbc::connection" method "prepare" line 2)
    invoked from within
"$connector prepare $sql"
    (object "::DIO::tdbc0" method "::DIO::Tdbc::exec" body line 9)
    invoked from within
"exec $req"
    (object "::DIO::tdbc0" method "::DIO::Database::forall" body line 4)
    invoked from within
"$dioObject forall  "select key_,data from $sessionCacheTable where package_='$packageName' and session_id='[$this id]'" a {
            dict set packa..."
    (object "::SESSION" method "::Session::load" body line 4)
    invoked from within
"$session_obj load status"
    invoked from within
"is_logged"
    (object "::Login" method "::rwdatas::NGIS::menu_list" body line 26)
    invoked from within
"$urlh menu_list $::rivetweb::current_page"
    (object "::rwpage::snigHome0" method "::rwpage::RWPage::prepare_content" body line 18)
    invoked from within
"$::rivetweb::current_page prepare_content     [::rwdatas::UrlHandler::current_handler]       $::rivetweb::language $argsqs"
    (in namespace eval "::rivetweb" script line 73)
    invoked from within
"namespace eval ::rivetweb {

    ::rivet::apache_log_error debug "running rivetweb request handler ([pwd])"

# determining if the 'rewrite_par' argume..."
    ("eval" body line 14)
    invoked from within
"eval $::rivetweb::handler_script"
    ("::try" body line 2)
OUTPUT BUFFER:
# -- before.tcl
#
#+
# This is where at every request most of the work is done to prepare a page. 
# rivet_before sets some Rivetweb status variables depending on the value
# of some typically urlencoded parameters.
# Code is running within the ::rivetweb namespace, but we keep to 
# fully qualify variables so to make explicit their role of status variables
# in the request processing
#
#-
#

namespace eval ::rivetweb {

    ::rivet::apache_log_error debug "running rivetweb request handler ([pwd])"

# determining if the 'rewrite_par' argument is in the query
# list of arguments and in case set the rewrite_links flag
# and the 'rewrite_code' free form code

    set rewrite_par [$::rivetweb::url_composer get_rewrite_par]
    set ::rivetweb::rewrite_links [::rivet::var_qs exists $rewrite_par]
    if {$::rivetweb::rewrite_links} {
        set ::rivetweb::rewrite_code [::rivet::var_qs get $rewrite_par]
    } else {
        set ::rivetweb::rewrite_code ""
    }

# we collect the URL-specified arguments and then we move on determining
# whether this has to be considered the home page of the web site (mostly
# to allow template specific determination)
# The is_homepage determination can be overridden in the site specific
# before script

    set argsqs [dict create {*}[::rivet::var_qs all]]
    set ::rivetweb::is_homepage [::rivet::lempty [::rivetweb::strip_sticky_args $argsqs]]

    # it's not clear whether determing the template key here
    # is useful. It's supposed to be in RWPage but since even
    # classes derived from RWWebService may use template_key
    # to generate HTML fragments we do determine this
    # control variable here
    #

    set template_key [::rivetweb::select_template]

# we determine the language for this request
# (keep in mind we are running within the ::rivetweb namespace)

    if {[::rivet::var exists lang]} {
        set language [::rivet::var get lang]
    } elseif {[::rivet::var exists language]} {
        set language [::rivet::var get language]
    } else {
        set language $::rivetweb::default_lang
    }

# site specific 'before' script (if any) runs here.

    if {$::rivetweb::site_before_script != ""} {
        ::rivet::apache_log_error debug "running specific 'before' script -> $::rivetweb::site_before_script"
        source $::rivetweb::site_before_script
    }

#
# the central point is exactly here: we determine which page we have to display
#

    $::rivetweb::logger log debug "registered handlers: [::rwdatas::UrlHandler::registered_handlers]"
    $::rivetweb::logger log debug "argsqs: $argsqs, language: $language"

    set ::rivetweb::current_page [::rwdatas::UrlHandler::select_page $argsqs]

    $::rivetweb::logger log debug "\[::rwdatas::UrlHandler::select_page $argsqs\] returned $::rivetweb::current_page"

#
# The three stage generation of a page
#
#    * page content preparation
#    * HTTP header generation and transmission
#    * page data transmission
#

    set ::rivetweb::page_content $::rivetweb::page_key
    set ::rivetweb::current_page  [$::rivetweb::current_page prepare_content    \
                                  [::rwdatas::UrlHandler::current_handler]      \
                                  $::rivetweb::language $argsqs]

# sending headers

    $::rivetweb::current_page send_headers

# let's proceed with the post processing and data generation

    $::rivetweb::current_page send_output $language
}