Error handler for a proxy server computer system

• US 6,134,680 A
• Filed: 06/22/1998
• Issued: 10/17/2000
• Est. Priority Date: 10/16/1997
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Yeomans, Andrew James Victor
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): Baderman, Scott T.
• Application Number:
  US09/102,501
• Time in Patent Office: 848 Days
• Field of Search: 714/48, 714/57, 714/4, 709/219, 709/239, 709/217, 709/244, 709/250
• US Class Current: 714/57
• CPC Class Codes: G06F 11/0709 in a distributed system consisting of a plurality of standalone computer nodes, e.g. clusters, client-server systems
• CPC Class Codes: G06F 11/0793 Remedial or corrective actions recovery from an exception in an instruction pipeline G06F9/3861; by retry G06F11/1402; for recovering from a failure of a protocol instance or entity H04L69/40
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

An error handler for a proxy server computer system receives a universal resource locator from a remote user terminal, accesses from a computer network a data file identified by the universal resource locator for supply to the user terminal, automatically modifies the universal resource locator in response to detection of a failure by the accessing means to access the data file, determines if a data file identified by the modified universal resource locator is accessible to the user terminal, and returns variable data indicating the error and offering remedial options to the user.

Claims

1. An error handler for a proxy server computer system, the error handler comprising:

means for receiving a universal resource locator from a remote user terminal;

means for accessing from a computer network a data file identified by the universal resource locator for supply to the user terminal;

means for automatically modifying the universal resource locator in response to detection of a failure by the accessing means to access the data file; and

,

means for determining if a data file identified by the modified universal resource locator is accessible to the user terminal.

2. An error handler as claimed in claim 1, comprising means for reporting to the user terminal that the data file identified by the modified universal resource identifier is accessible.

3. An error handler as claimed in claim 1, comprising a protocol store storing a plurality of protocols for insertion in the universal resource locator.

4. An error handler as claimed in claim 1, comprising a server name store storing a plurality of server names for insertion in the universal resource locator.

5. An error handler as claimed in claim 1, comprising a file extension store storing a plurality of file extensions for insertion in the universal resource locator.

6. A proxy server computer system comprising:

memory means;

a central processing unit;

first network adapter means for connecting the proxy server to a remote user terminal;

second network adapter means for connecting the proxy server to a network of server computer systems;

a bus architecture interconnecting the memory means and the central processing unit, the first network adapter means and the second network adapter means, and an error handler comprising;

means for receiving a universal resource locator from a remote user terminal;

means for accessing from a computer network a data file identified by the universal resource locator for supply to the user terminal;

means for automatically modifying the universal resource locator in response to detection of a failure by the accessing means to access the data file; and

,

means for determining if a data file identified by the modified universal resource locator is accessible to the user terminal.

7. A method for handling errors in a proxy server computer system comprising:

receiving a universal resource locator from a remote user terminal;

accessing from a computer network a data file identified by the universal resource locator for supply to the user terminal;

automatically modifying the universal resource locator in response to detection of a failure by the accessing process to access the data file; and

, determining if a data file identified by the modified universal resource locator is accessible to the user terminal.

8. A method as claimed in claim 7, comprising reporting to the user terminal that the data file identified by the modified universal resource identifier is accessible.

9. A method as claimed in claim 7, comprising storing a plurality of protocols for insertion in the universal resource locator.

10. A method as claimed in claim 7, comprising storing a plurality of server names for insertion in the universal resource locator.

11. An method as claimed in claim 7, comprising storing a plurality of file extensions for insertion in the universal resource locator.