This plugin is meant to 'catch' broken URLs still listed in Google. If a 404 message comes up, this plugin checks for a referrer, and if that contains a search query (q=...) it redirects to the search plugin.
Installation:
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Upload files to /plugins
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Install through admin panel
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Optionally: edit search plugin (see below)
» Discuss here
The plugin passes the Google query to the search plugin, but since the current search plugin doesn't support queries though GET, it won't show them. If you want...