[SalesForce] “Too many SOQL queries: 101” – Apex error occurred while executing Site URL Rewriter

Here is the scenario, when I receive error message.

"Apex error occurred while executing Site URL Rewriter"

I have a link in my VF page to export records as excel. on click of this export link, I call VF page which has content type as "application/vnd.ms-excel#Test.xls"

After implementing URLRewrite, whenever I click on export, it ends up with the above error message. In the debug log it is logged as "Too many SOQL queries: 101"

Below is the URLRewrite class:
global class URLRedirect_URLRewriter implements Site.UrlRewriter {

    //Variables to represent the user-friendly URLs for     
    //foo pages 

    String FOO_PAGE = '/foo/';

    //Variables to represent my custom Visualforce pages     

    String FOO_VISUALFORCE_PAGE = '/FooDetails?fooid=';    
    String LIST_FOO_VISUALFORCE_PAGE = '/Foo';

    global PageReference mapRequestUrl(PageReference myFriendlyUrl)
    {
        String url = myFriendlyUrl.getUrl();        
        if(url.startsWith(FOO_PAGE) && !url.contains('&'))
        {
            String name = url.substring(FOO_PAGE.length(), url.length());
            IPFooObject grp;
            try
            {  
                grp = [select Id,Name,Name__c from IPFooObject where Name =:name LIMIT 1];
                if (grp != null)
                {
                    return new PageReference(FOO_VISUALFORCE_PAGE + grp.id);
                }
                else
                {
                    return new PageReference(LIST_FOO_VISUALFORCE_PAGE);
                }
            }
            catch(exception ex)
            {
                return new PageReference(LIST_FOO_VISUALFORCE_PAGE);
            }
        }
        //If the URL isn't in the form of a foo page, continue with the request 

        return null;
    }

    global List<PageReference> generateUrlFor(List<PageReference> mySalesforceUrls)
    {
        //A list of pages to return after all the links  
        //have been evaluated 

        List<PageReference> myFriendlyUrls = new List<PageReference>();

        //a list of all the ids in the urls 

        List<id> grpIds = new List<id>();

        // loop through all the urls once, finding all the valid ids 
        List<String> lstString = new List<String>();
        for(PageReference mySalesforceUrl : mySalesforceUrls)
        {
            lstString.add(mySalesforceUrl.getUrl());
        }

        for(PageReference mySalesforceUrl : mySalesforceUrls)
        {
            //Get the URL of the page     
            String url = mySalesforceUrl.getUrl();        
            if(url.startsWith(FOO_VISUALFORCE_PAGE) && !url.contains('&'))
            {
                //Extract the ID from the query parameter 
                //and store in a list 
                //for querying later in bulk. 
                string id= url.substring(FOO_VISUALFORCE_PAGE.length(),url.length());
                grpIds.add(id);
            }
        }

        // Get all the group names in bulk 
        List <IPFooObject> groups = [SELECT Name FROM IPFooObject WHERE Id IN :grpIds];
        // make the new urls 

        Integer counter = 0;

        // it is important to go through all the urls again, so that the order 
        // of the urls in the list is maintained.  

        for(PageReference mySalesforceUrl : mySalesforceUrls) 
        {
           //Get the URL of the page 
           String url = mySalesforceUrl.getUrl();

           if(url.startsWith(FOO_VISUALFORCE_PAGE)  && !url.contains('&'))
           {
                myFriendlyUrls.add(new PageReference(FOO_PAGE + groups.get(counter).name));
                counter++;
           } 
           else 
           {
                //If this doesn't start like a groups page,     
                //don't do any transformations     
                myFriendlyUrls.add(mySalesforceUrl);
           }
        }
        return myFriendlyUrls;
  }

}

While debugging I noticed that, below line is getting is executed more than once.
List groups = [SELECT Name FROM IPFooObject WHERE Id IN :grpIds];

Why is the line getting executed so many times? What's wrong with the code?

Here is the VFPage being called through commandLink:

<apex:page readOnly="false" controller="myController" contentType="application/vnd.ms-excel#{!IF(AND((ExportTitle <> null),(ExportTitle <> '')),ExportTitle,'Patents')}.xls" showHeader="false" standardStylesheets="false" action="{!PageLoad}" cache="true">
    <apex:stylesheet value="{!URLFOR($Resource.IVExchange_Styles, 'CSS/PageStyles.css')}" />
    <apex:form >
        <apex:outputPanel id="FooExport">
            <apex:dataTable value="{!lstFooInfo}" var="lst" id="FooListTable" styleClass="fullwidth" cellpadding="5" headerClass="userTableHeaderWidth" rowClasses="oddRow TextPriority10, evenRow TextPriority10" border="1">
                <apex:column >
                    <apex:facet name="header"><span class="userTableListHeader alignLeft">Group No.</span></apex:facet>
                    <apex:outputText value="{!lst.GroupNumber}"></apex:outputText>
                </apex:column>
                <apex:column >
                    <apex:facet name="header"><span class="userTableListHeader">Group Name</span></apex:facet>
                    <apex:outputText value="{!lst.GroupName}"></apex:outputText>
                </apex:column>
                <apex:column >
                    <apex:facet name="header"><span class="userTableListHeader">Issue Date</span></apex:facet>
                    <apex:outputText value="{0,date,yyyy'-'MM'-'dd}">
                        <apex:param value="{!lst.IssueDate}" />
                    </apex:outputText>
                </apex:column>
                <apex:column rendered="{!if((LOWER($CurrentPage.parameters.seltab) == 'licensed' && ($CurrentPage.parameters.grpid != '')),true,false)}">
                    <apex:facet name="header"><span class="userTableListHeader">Participating</span></apex:facet>
                    <apex:outputText value="{!lst.Participating}"></apex:outputText>                                                         
                </apex:column>
            </apex:dataTable>       
        </apex:outputPanel>
    </apex:form>
</apex:page>