[Solr Wiki] Update of "FAQ" by TomasFernandezLobbe

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The "FAQ" page has been changed by TomasFernandezLobbe:
https://wiki.apache.org/solr/FAQ?action=diff&rev1=96&rev2=97

  There is a wiki page on some brainstorming on how to implement   tagging within Solr [UserTagDesign].
  
  == How can I get hold of HttpServletRequest object in custom first-component? ==
+ Set the attribute "addHttpRequestToContext" in the "requestParsers" element to "true" in your solrconfig.xml.
  
+ Use it in your custom componet like: 
- All the request for Solr are served by SolrDispatchFilter. You can extend this filter and override protected execute method to add request object to context in following way
-  1., Create a custom filter class by extending SolrDispatchFilter and override execute method.
- {{{#!java
- package com.custom;
- 
- public class CustomSolrDispatchFilter extends SolrDispatchFilter
- {
- 
- 	@Override
- 	protected void execute( HttpServletRequest req, SolrRequestHandler handler, SolrQueryRequest sreq, SolrQueryResponse rsp) {
- 
- 		sreq.getContext().put("httpRequest", req);
-   		super.execute(req, handler, sreq, rsp);
- 
- 	}
- 
- }
- }}}
-  2., Modify '''web.xml''' to map your filter class instead of SolrDispatchFilter. As custom filter is extended from SolrDispatchFilter everything else apart from execute method gets called from parent.
- {{{
- <filter>
-     <filter-name>CustomSolrDispatchFilter</filter-name>
-     <filter-class>com.custom.CustomSolrDispatchFilter</filter-class>
- </filter>
- <filter-mapping>
-  <filter-name>CustomSolrDispatchFilter</filter-name>
-  <url-pattern>/*</url-pattern>
- </filter-mapping>
- }}}
-  3., Rebuild Solr WAR
-  4., Now you can get hold of HttpServletRequest object in your custom first component in following way
  {{{#!java
  public class CustomSearchComponent extends SearchComponent {
  
@@ -379, +350 @@

  	}
  }
  }}}
+ See https://cwiki.apache.org/confluence/display/solr/RequestDispatcher+in+SolrConfig#RequestDispatcherinSolrConfig-requestParsersElement