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Allow/block the incoming request based on the request header in IIS/Sharepoint server
String clientId=Request.getHeaderValue('clientID');
String userAgent=Request.getHeaderValue('useragent');

//If clientId and userAgent are empty abort the request

 if(clientId.equals('') && userAgent.equals('')){

//Abort the request
}

//If clientId is not empty but is not matching my expected value,then abort the    request.
if(!clientId.equals('') && !clientId.equals('1234'){

//Abort the request
}

//If userAgent is not matching my expected value ,then abort the request.
if(!userAgent.equals('myfavbroswer')){

//Abort the request

}