const crawler = require('crawler-request');
 
crawler("https://stackoverflow.com/").then(function(response){
    // handle response
    console.log(response.text.lenght);
});

const crawler = require('crawler-request');
 
crawler("http://careers.stackoverflow.com/stack_overflow_careers.pdf").then(function(response){
    // handle response
    console.log(response.text.lenght);
});

const crawler = require('crawler-request');
 
function response_text_size(response){
    response["size"] = response.text.length;
    return response;
}
 
crawler("https://stackoverflow.com/",response_text_size).then(function(response){
    // handle response
    console.log(response.size);
});