Systems and methods of using the refresh button to determine freshness policy

• US 8,701,010 B2
• Filed: 03/12/2007
• Issued: 04/15/2014
• Est. Priority Date: 03/12/2007
• Status: Active Grant

• Current Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Original Assignee: Citrix Systems, Inc. (Cloud Software Group)
• Inventors: Plamondon, Robert
• Primary Examiner(s): Ng, Amy
• Assistant Examiner(s): Takele, Meseker
• Application Number:
  US11/685,141
• Publication Number:
  US 20080229025A1
• Time in Patent Office: 2,591 Days
• Field of Search: 715/736, 715/734, 715/859, 709/202, 709/217, 709/219
• US Class Current: 715/736
• CPC Class Codes: G06F 12/0862 with prefetch
• CPC Class Codes: G06F 2212/1044 Space efficiency improvement
• CPC Class Codes: H04L 67/10 in which an application is distributed across nodes in the network software deployment G06F8/60; multiprogramming arrangements G06F9/46
• CPC Class Codes: H04L 67/2885 Hierarchically arranged intermediate devices, e.g. for hierarchical caching
• CPC Class Codes: H04L 67/56 Provisioning of proxy services store-and-forward switching systems in data switching networks H04L12/54
• CPC Class Codes: H04L 67/5681 Pre-fetching or pre-delivering data based on network characteristics
• CPC Class Codes: H04L 67/5682 Policies or rules for updating, deleting or replacing the stored data

Abstract

The present solution provides a variety of techniques for accelerating and optimizing network traffic, such as HTTP based network traffic. The solution described herein provides techniques in the areas of proxy caching, protocol acceleration, domain name resolution acceleration as well as compression improvements. In some cases, the present solution provides various prefetching and/or prefreshening techniques to improve intermediary or proxy caching, such as HTTP proxy caching. The acceleration and optimization techniques described herein may be deployed on the client as a client agent or as part of a browser, as well as on any type and form of intermediary device, such as an appliance, proxying device or any type of interception caching and/or proxying device.

Claims

1. A method for updating an expiration period of a cached object responsive to one or more requests to refresh the object on a page, the method comprising:

(a) intercepting, by a device intermediary to a plurality of clients and a server, a request from a client of the plurality of clients to the server to refresh a page identifying an object, the device having a cache storing the object from the server'"'"'s response to a previous request in the cache with an expiration period, the device serving the object from the cache to requests for the object from the plurality of clients to the server;

(b) identifying, by the device, a number of refresh requests intercepted by the device for the page;

(c) determining, by the device in response to detecting that the request is to refresh the page, that the expiration period of the cached object is to be shortened and creating a second expiration period for the cached object that corresponds to a difference between the expiration period and a predetermined amount based on the number of refresh requests; and

(d) changing, by the device, the expiration period for the cached object in the cache to a value of the second expiration period.

2. The method of claim 1, wherein step (b) comprises setting, by the device in response to the request, the second expiration period shorter than the expiration period.

3. The method of claim 1, wherein step (a) comprises intercepting, by the device, the request to refresh a page, the request generated by selecting a refresh button provided by a browser application.

4. The method of claim 1, wherein step (a) comprises intercepting, by the device, the request to refresh a page generated by a user selecting a button of a browser application.

5. The method of claim 1, further comprising intercepting, by the device, a plurality of requests to refresh the page.

6. The method of claim 5, comprising determining, by the device in response to the plurality of requests, to decrease the expiration period of the cached object by a predetermined threshold.

7. The method of claim 1, wherein step (a) further comprises intercepting, by the device, the request to refresh the page after a predetermined time threshold.

8. The method of claim 7, further comprising intercepting, by the device, the request to refresh the page beyond a predetermined time after forwarding the page to a requester.

9. The method of claim 7, further comprising intercepting, by the device, the request to refresh the page beyond a predetermined time after receiving a previous request to refresh the page.

10. The method of claim 1, wherein the device comprises one of the client, the server, or an appliance intercepting and forwarding communications between the client and the server.

11. A device intermediary to a plurality of clients and a server for updating an expiration period of a cached object responsive to one or more requests to refresh the object on a page, the device comprising:

a cache storing one or more objects from a server'"'"'s response to a previous request with an expiration period, the device configured to serve an object from the cache to requests for the object from the plurality of clients to the server;

means for intercepting a refresh request from a client of the plurality of clients to a server of the at least one server to refresh a page identifying an object, the object from the server'"'"'s response to a previous request stored in the cache with an expiration period;

means for identifying a number of refresh requests intercepted by the device for the page;

means for determining, in response to detecting that the request is to refresh the page, that the expiration period of the cached object is to be shortened and creating a second expiration period for the cached object that corresponds to a difference between the expiration period and a predetermined amount based on the number of refresh requests; and

means for changing the expiration period for the cached object in the cache to a value of the second expiration period.

12. The device of claim 11, wherein the device sets the second expiration period shorter than the expiration period in response to the request.

13. The device of claim 12, wherein the device in response to the plurality of requests decreases the expiration period of the cached object by a predetermined threshold.

14. The device of claim 11, wherein the request to refresh a page comprises a request generated by selecting a refresh button provided by a browser application.

15. The device of claim 11, wherein the request to refresh a page is generated by a user selecting a button of a browser application.

16. The device of claim 11, wherein the device intercepts a plurality of requests to refresh the page.

17. The device of claim 11, wherein the device intercepts the request to refresh the page after a predetermined time threshold.

18. The device of claim 17, wherein the request to refresh the page is received by device beyond a predetermined time after forwarding the page to a requester.

19. The device of claim 17, wherein the request to refresh the page is received by device beyond a predetermined time after intercepting a previous request to refresh the page.

20. The device of claim 11, wherein the device is one of the client, the server, or an appliance intercepting and forwarding communications between the client and the server.

21. A method for decreasing expiration period of a cached object in response to a refresh request for a page corresponding to the object, the method comprising:

a) identifying, by a device intermediary to a plurality of clients and a server, that an intercepted request of a client of the plurality of clients to the server for a page identifying an object is a request to refresh the page, the object stored in a cache of the device from the server'"'"'s response to a previous request and the object having an expiration period, the device serving the object from the cache to requests for the object from the plurality of clients to the server;

(b) identifying, by the device, a number of refresh requests intercepted by the device for the page;

c) determining, by the device in response to identifying that the request is a request to refresh the page, that the expiration period is to be shortened; and

d) serving, by the device responsive to the request, the object from the cache and decreasing, by the device in response to the determination, the expiration period of the object stored in the cache by a predetermined amount based on the number of refresh requests.

22. The method of claim 21, further comprises determining that a number of requests to refresh the page received by the device has reached a predetermined threshold and responsive to reaching the predetermined threshold, determining that the expiration period is to be shortened.