无需浏览器即可以编程方式保持HTTP Session Alive

Question

For one of our requirements I am talking between two servers using HTTP protocol. The interaction is long running, where a user might not interact with the other site for pretty long intervals.

When they come to the page, the log in into the remote site. Every time user tried to interact with the remote site, internally I make a HTTP call (authetication is done based on sessionId).

I was wondering if there is a way to also refresh the session and ensure that it does not expire.

As per my limited understanding, browser handles this by passing keep-alive in header or cookie (which I don't understand completely). Can anyone suggest a programmatic way in Java to achieve keep-alive behavior

Answer 1

1.

 <session-config>
         <session-timeout>-1</session-timeout>
 </session-config>

Simply paste this piece if code in your deployment descriptor (DD).
If you want to keep your session alive for a particular duration of time replace -1 with any positive numeric value.
Time specified here is in minutes.

2.

If you want to change session timeout value for a particular session instance without affecting the timeout length of any other session in the application :

session.setMaxInactiveInterval(30*60);

** * ** * ** * ** * ** * ** * ** * *
Note :

1.In DD, the time specified is in minutes .
2.If you do it programatically, the time specified is in seconds .

Hope this helps :)

Answer 2

I guess below code can help you, if you can pass JSESSIONID cookie then your container will take responsibility to keep the session alive if its same session that might be created from some other browser.

find the link below that explained a lot.

Click Here

Code snippet from the link above

    BasicCookieStore cookieStore = new BasicCookieStore();
    BasicClientCookie cookie = new BasicClientCookie("JSESSIONID", "97E3D1012B3802114FA0A844EDE7B2ED");
    cookie.setDomain("localhost");
    cookie.setPath("/CookieTest");
    cookieStore.addCookie(cookie);
    HttpClient client = HttpClientBuilder.create().setDefaultCookieStore(cookieStore).build();

    final HttpGet request = new HttpGet("http://localhost:1234/CookieTest/CookieTester");

    HttpResponse response = client.execute(request);

Answer 3

Take a look of Apache HttpClient and see its tutorial . HttpClient supports keep alive headers and other features that should enable you to programmatically make an HTTP call.