Method and system for providing improved URL mangling performance using fast re-write

• US 7,917,523 B2
• Filed: 04/05/2006
• Issued: 03/29/2011
• Est. Priority Date: 04/05/2006
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Somasundaram, Mahadev, Dixit, Vineet, Jayasenan, Siva S.
• Primary Examiner(s): Ali; Mohammad
• Assistant Examiner(s): Shmatov; Alexey
• Application Number:
  US11/399,013
• Publication Number:
  US 20070239732A1
• Time in Patent Office: 1,819 Days
• Field of Search: 707/10, 707/206, 707/999.01, 707/999.206, 707/756, 707/693
• US Class Current: 707/756
• CPC Class Codes: G06F 16/9566 URL specific, e.g. using aliases, detecting broken or misspelled links

Abstract

Method and system for providing improved uniform resource locator (URL) mangling performance using fast re-write including scanning a web page, detecting an absolute URL in the web page, and modifying the detected absolute URL to a corresponding relative URL in the web page, is disclosed.

Claims

1. A method of providing uniform resource locator (URL) mangling, comprising the steps of:

receiving a web page requested by a client terminal at a gateway;

scanning the web page at the gateway;

detecting an absolute URL in the web page, the absolute URL having a transmission protocol portion, and a colon located after the transmission protocol portion;

placing at least a portion of the detected absolute URL in a packet buffer of a forwarding path at the gateway; and

modifying, by the gateway, the at least a portion of the detected absolute URL in the packet buffer so as to convert the absolute URL into a corresponding relative URL in the web page, the modifying including;

removing a selected character of the detected absolute URL and adding a “

/”

before the transmission protocol portion of the detected absolute URL,

replacing the colon located after the transmission protocol portion of the detected absolute URL with a predetermined character,

maintaining a same number of characters in the relative URL as found in the detected absolute URL, and

retaining the at least a portion of the detected absolute URL in the packet buffer of the forwarding path during the modifying.

2. The method of claim 1 wherein the step of detecting an absolute URL includes the step of detecting the colon in the URL.

3. The method of claim 1 wherein the predetermined character includes an alphanumeric character.

4. The method of claim 1 further comprising the step of transmitting the web page from the gateway to the client terminal, after the modifying step.

5. The method of claim 1 wherein the modifying further comprises:

locating the transmission protocol portion of the detected absolute URL.

6. The method of claim 1 wherein the modifying further comprises:

substituting a “

http;

//”

portion of the detected absolute URL with “

httpX//”

, wherein “

X”

is a predetermined character.

7. The method of claim 1 wherein the modifying further comprises:

substituting a “

http;

”

portion of the detected absolute URL with “

/http”

.

8. The method of claim 1 wherein the modifying further comprises:

scanning only a limited number of characters located at the beginning of the detected absolute URL; and

based on the scanning of only the limited number of characters, modifying the detected absolute URL.

9. The method of claim 1 wherein the gateway is a secure socket layer virtual private network (SSLVPN) gateway coupled to one or more private networks, and configured to provide secure access to the one or more private networks.

10. A method of performing URL mangling, comprising:

receiving, at a gateway, an access request from a client terminal for a web page;

receiving the requested web page at the gateway;

detecting a URL in the web page, the URL having a transmission protocol portion, and a colon located after the transmission protocol portion;

placing at least a portion of the detected URL in a packet buffer of a forwarding path at the gateway; and

mangling the at least a portion of the detected URL, by the gateway, to create a relative URL, by removing a selected character and adding a “

/”

before the transmission protocol portion, and replacing the colon with a predetermined character, while

maintaining a same number of characters in the relative URL as found in the detected URL, and

retaining the at least a portion of the detected URL in the packet buffer of the forwarding path during the mangling.

11. The method of claim 10 wherein the transmission protocol portion includes an indication of hyper text transmission protocol.

12. The method of claim 10 wherein the access request is received over a public data network.

13. The method of claim 10 wherein the requested web page is received over a private data network.

14. The method of claim 13 wherein the requested web page is received from a web server in the private data network.

15. A method of providing URL mangling, comprising:

detecting an absolute URL in a web page received at a gateway from a web server, the web page having been requested by a client terminal;

storing at least a portion of the detected absolute URL in a packet buffer of a forwarding path at the gateway, the detected absolute URL having a transmission protocol portion, and a colon located after the transmission protocol portion; and

performing URL mangling on the detected absolute URL at the gateway before providing the web page to the client terminal, the URL mangling modifying the at least a portion of the detected absolute URL so as to convert the detected absolute URL into a relative URL by;

removing a selected character of the detected absolute URL and adding a “

/”

before the transmission protocol portion of the detected absolute URL, and

replacing the colon located after the transmission protocol portion of the detected absolute URL with a predetermined character, while

maintaining a same number of characters in the relative URL as found in the detected absolute URL, and

retaining the at least a portion of the detected absolute URL in the packet buffer of the forwarding path during the URL mangling.

16. The method of claim 15 wherein the predetermined character includes an alphanumeric character.

17. The method of claim 15 wherein the step of detecting the absolute URL includes the steps of:

scanning the web page; and

identifying the colon in the URL.

18. The method of claim 17 wherein the colon is located immediately following a transmission protocol portion of the URL.

19. The method of claim 18 wherein the transmission protocol portion includes an indication of hyper text transmission protocol (http).

20. A system for providing URL mangling, comprising:

a web server; and

a gateway operatively coupled to the web server via a network connection, the gateway configured to

receive a web page from the web server,

scan the received web page to detect an absolute URL in the webpage,

store at least a portion of the detected absolute URL in a packet buffer of a forwarding path at the gateway, the detected absolute URL having a transmission protocol portion, and a colon located after the transmission protocol portion, and

modify the at least a portion of the absolute URL in the web page so as to convert the absolute URL into a relative URL by;

removing a selected character of the detected absolute URL and adding a “

/”

before the transmission protocol portion of the detected absolute URL, and

replacing the colon located after the transmission protocol portion of the detected absolute URL with a predetermined character, wherein the relative URL has a same number of characters as found in the absolute URL in the web page, and the modifying is performed while the at least a portion of the URL is maintained in the packet buffer of the forwarding path.

21. The system of claim 20 wherein the gateway includes a secure socket layer virtual private network (SSLVPN) gateway.

22. The system of claim 20 wherein the gateway is operatively coupled to a private data network including the web server.

23. The system of claim 20 further including a client terminal operatively coupled to the gateway over a public data network.

24. The system of claim 23 wherein the gateway is configured to transmit the web page with relative URL to the client terminal.

25. The system of claim 20 wherein the gateway is configured to modify the absolute URL in the web page to the relative URL by being configured to substitute a “

http;

//”

portion of the absolute URL with “

httpX//”

, wherein “

X”

is a predetermined character.

26. The system of claim 20 wherein the gateway is configured to modify the absolute URL in the web page to the relative URL by being configured to substitute a “

http;

”

portion of the detected absolute URL with “

/http”

.

27. The system of claim 20 wherein the gateway is configured to modify the absolute URL in the web page to the relative URL by being configured to scan only a limited number of characters located at the beginning of the absolute URL and based on the scan of only the limited number of characters, modify the absolute URL.

28. A system for providing URL mangling, comprising:

means for receiving a web page requested by a client terminal at a gateway;

means for scanning the web page at the gateway;

means for detecting an absolute URL in the web page, the absolute URL having a transmission protocol portion, and a colon located after the transmission protocol portion;

means for storing at least a portion of the detected URL in a packet buffer of a forwarding path at the gateway; and

means for modifying, at the gateway, the at least a portion of the detected absolute URL so as to convert the detected absolute URL into a corresponding relative URL in the web page, the modifying include;

removing a selected character of the detected absolute URL and adding a “

/”

before the transmission protocol portion of the detected absolute URL,

replacing the colon located after the transmission protocol portion of the detected absolute URL with a predetermined character,

maintaining a same number of characters in the relative URL as found in the detected absolute URL, and

retaining the at least a portion of the detected URL in the packet buffer of the forwarding path during the modification.