Request.Servervariables("HTTP_REFERER") versus BACK button on browser

[JJA]

When my webserver does not process a user's change because of an
invalid password, I inform the user and I want to present them a
button for a retry:

<TR id=continuebuttonrow>
<td width="05%">&nbsp;</td>
<TD width="90%" align=center valign=middle colspan=2>
<BUTTON TYPE=BUTTON
ONCLICK="location.href='<% =
Request.ServerVariables("HTTP_REFERER") %>';"
class=btnParms name=btnContinue ID="Button3">Try Again (Back)</BUTTON>
</td>

Yet if this button is clicked, they go back to the server and the page
is refreshed with original values.

If I click the browser's BACK button (rather than my button above), I
go back to the page (from cache I guess) I want (because it contains
the user changes). Here I can correct the password without having to
rekey the changes.

So, what is the Request.Servervariable needed for the equivalent of
the BACK button? Thanks.

 

[Aaron [SQL Server MVP]]

You would use client-side script only, e.g.

onclick='window.history.back();'