HttpClient处理服务器注销

Question

Class Site define a website that has methods to login and parse data. I have a separate class Browser that contains an httpclient class that is used extensively by all instances of Site.

What I would like to do is implement exception handling into Browser so that if Site is ever logged out (this would be determined by examining the response), it would attempt to log back in, and retry the same get request as if nothing ever happened. However, I am not sure how to structure this since the login method would be located in the Site object. Pseudo-code would be something like this

static class Browser
    static get_url(string url)
    try
    { 
        fetch url with http client; 
        if (session logged out) 
            throw logged out exception
    }
    catch (logged out exception)
    { 
        site.login, get_url(url) 
    }

class Site
    update(url)
    {
        content = Browser.get_url(url)
    }

Answer 1

What i would do is add some sort of ValidateLogin method before each execution of a GetUrl method. This can be a cached value which expires every X minutes, or can be a simply REST request send through the browser.

It would look along the lines of this:

public class Site
{  
   public void Update(string url)
   {
       var isLoggedIn = Browser.ValidateLogin();
       if (!isLoggedIn)
       {
          this.Login();
       }

       Browser.GetUrl(url);
   }
}