WO2005116855A1 - Dual web server system and method using host server in p2p web server configuration - Google Patents

Dual web server system and method using host server in p2p web server configuration Download PDF

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Publication number
WO2005116855A1
WO2005116855A1 PCT/KR2004/002220 KR2004002220W WO2005116855A1 WO 2005116855 A1 WO2005116855 A1 WO 2005116855A1 KR 2004002220 W KR2004002220 W KR 2004002220W WO 2005116855 A1 WO2005116855 A1 WO 2005116855A1
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WO
WIPO (PCT)
Prior art keywords
web
client pc
server
web server
central server
Prior art date
Application number
PCT/KR2004/002220
Other languages
French (fr)
Inventor
Han-Ju Kim
Original Assignee
Tnaru Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to KR10-2004-0038756 priority Critical
Priority to KR1020040038756A priority patent/KR100496172B1/en
Application filed by Tnaru Co., Ltd. filed Critical Tnaru Co., Ltd.
Publication of WO2005116855A1 publication Critical patent/WO2005116855A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L61/00Network arrangements or network protocols for addressing or naming
    • H04L61/15Directories; Name-to-address mapping
    • H04L61/1541Directories; Name-to-address mapping for service discovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/12Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00 characterised by the data terminal
    • H04L29/12009Arrangements for addressing and naming in data networks
    • H04L29/12047Directories; name-to-address mapping
    • H04L29/12113Directories; name-to-address mapping for service discovery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network-specific arrangements or communication protocols supporting networked applications
    • H04L67/02Network-specific arrangements or communication protocols supporting networked applications involving the use of web-based technology, e.g. hyper text transfer protocol [HTTP]

Abstract

Disclosed is a dual web service system and method wherein a central server for buffering data of a web server substitutes for a web server that cannot provide the web service. The system includes a requesting client for transmitting a domain name of a web server client to a central server to access web site, receiving actual network access information from the central server, and accessing the web site using the information to receive web service; the web server client periodically backing up web site data of the web site on the central server, and providing the web service through web site; and the central server checking, in real time, whether the web server client can provide the web service, buffering a backup web site received from the web server client, and transmitting network access information of the backup web site if the web server client cannot provide web service.

Description

DUAL WEB SERVER SYSTEM AND METHOD USING HOST SERVER IN P2P WEB SERVER CONFIGURATION

TECHNICAL FIELD The present invention relates to a dual web service system and method for

providing a web service in a web server in a P2P environment using a central server, and

more particularly to a dual web service system and method wherein a central server

backs up and buffers a web site provided by a web server which provides content through the web site, and the central server substitutes for the web server and provides

the web service through the backup web site when the web server cannot provide the

web service due to its failure.

BACKGROUND ART

As a network has been developed and a client/server model has been introduced,

the client can now obtain required information without the need to store the information

in its PC by accessing the server and retrieving and downloading the information from the server each time the client requires the information.

Recently, a peer-to-peer (P2P) model has been suggested as a modification of the

client/server model. The P2P model is a technology in which each computer on a network functions as a client or server as needed and is connected to each other

computer to allow the users to share files.

The P2P model is characterized in that it compensates for limited capacity and

overload of the server in conventional server-based computing environments and provides new concept services to users or corporations. That is, as a method to

overcome problems in the server-based system in which the server alone contains and

uses all data, the P2P model distributes data to be shared over the network, thereby ensuring efficient management of data. In the conventional P2P environment, a central server is provided at the center of a network which is established for client PCs connected to the central server, and

specific directories of the client PCs connected to the network are set as 'shared' so that

each client PC communicates data directly with each other.

However, in the conventional P2P environment, data of a client PC, which is not connected to the central server, cannot be shared. That is, data sharing of the client PC

in the network depends on whether or not the client PC is connected to the central

server.

The dependency on the connection to the central server causes some problems. For example, a web server may be implemented in a specific client PC in the P2P

environment so that it functions as a web server client PC and provides a web service to

other client PCs through a web site. However, if the web server of the web server client PC is inoperable for whatever reason, client PCs requesting access to the web

server client PC must wait indefinitely until the web service is restored. In addition, the conventional central server is provided as a simple medium for

implementing the network supporting the P2P service for data sharing, and has a limited function similar to that of a domain name server which converts the domain name to an

IP address and provides the IP address. In an environment in which the web server client PC, together with other PCs, is connected to a router, the web server client PC cannot be accessed from the outside with its IP address alone until a proper URL

address of the web server client PC is specified.

DISCLOSURE OF INVENTION Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a system and method for providing

a dual web service in a web server in a P2P environment using a central server, wherein

a central server is provided with a function to convert a domain name to an IP address or

a URL address so that each individual client PC can serve as a web server, and a

buffering function to back up data of a web server client PC, and the central server

substitutes for the web server client PC and serves as a web server when the web server

client PC cannot provide the web service for whatever reason.

In order to accomplish the above object, the present invention provides a dual

web service system supporting a web service function of individual client PCs (personal computers) in a P2P (peer-to-peer) environment, which includes a requesting client PC for transmitting a domain name of a web server client PC to a central server in order to

access a web site of the web server client PC and to request data from the web server

client PC, receiving actual network access information of the web site corresponding to the domain name from the central server, and accessing the web site using the network

access information to receive a web service; the web server client PC including the web site implemented therein, accessing the central server to register the domain name and

the actual network access information of the web site, periodically backing up data of

the web site on the central server, and providing the web service through the web site upon receiving a web service request from the requesting client PC; and the central

server checking, in real time, whether or not the web server client PC can provide the

web service, buffering a backup web site received from the web server client PC,

receiving the domain name from the requesting client PC, transmitting the network

access information of the web server client PC if the web server client PC can provide

the web service, and transmitting network access information of the backup web site if

the web server client PC cannot provide the web service, wherein, if the web server

client PC cannot provide the web service, the central server provides, in real time, a web

service, associated with the access to the web site and the request for the data, to the requesting client PC through the buffered web site.

In one aspect of the invention, the web server client PC includes a P2P

connection unit for logging into the central server and maintaining connection to the

central server; a web server unit for providing a web service through a web site; a web server driving unit for automatically driving the web server unit when logging into the

central server through the P2P connection unit, and transmitting both a web service availability state of the web server unit and a network access path of the web site of the

web server unit to the central server; and a backup unit for automatically accessing the

central server to back up data of the web site of the web server unit on the central server.

In addition, if the requesting client PC inputs a domain name for accessing the

web site of the web server client PC when the web server client PC can provide the web service, the central server transmits an IP address of the web server client PC corresponding to the input domain name or an address/path of the central server having

information of the web site of the web server client PC, as network access information, to the requesting client PC, and when the requesting client PC accesses the central

server using the address/path of the central server, the central server provides a frame

having information of the web site data of the web server client PC, whereby the central server allows the web server client PC to provide the web service through the frame

even when the web server client PC is inaccessible with the IP address of the web server

client PC alone.

In addition, the central server includes a P2P connection processor for processing P2P access requests from a plurality of client PCs; a URL converter for

receiving and storing a domain name and actual network access information from the

web server client PC, receiving a domain name from the requesting client PC, checking

whether or not the web server client PC can provide the web service, and transmitting, in real time, network access information of the web server client PC or network access

information of the central server to the requesting client PC according to whether or not

the web server client PC can provide the web service; a URL address DB for receiving and storing a domain name and an IP address/path of the web server client PC from the

URL converter; a server buffer for buffering backup data of an updated web site

received from the web server client PC; a web site backup DB for storing the backup web site data buffered by the server buffer; and a dual web server unit for substituting

for the web server client PC and providing the web service through the web site stored

in the web site backup DB when the web server client PC cannot provide the web

service. In addition, the central server determines that the web server client PC cannot

provide the web service when the web server unit of the web server client PC is inoperable or when the web server client PC is powered off or is not accessible due to

network failure after the central server receives a domain name of a web site from the

requesting client PC and accesses the web server client PC using network access

information including an actual address of the web site. In addition, the central server checks, in real time, whether or not the web server

client PC can provide the web service, converts the network access information to an

address of the backup web site data buffered by the central server if the web server

client PC cannot provide the web service, and the central server converts the network

access information to an actual address of the web site data of the web server client PC if the web server client PC can provide the web service, whereby, upon receiving a web

site data request, including the domain name of the web server client PC, from the web

server client PC, the central server provides, in real time, network access information,

which is always ready to provide the web service, to the requesting client PC.

In another aspect of the present invention, there is also provided a dual web service method in a central server supporting a web service function of individual client

PCs in a P2P environment, which includes the steps of: 1), by the central server, receiving and storing actual network access information including an IP address and a

domain name from a web server client PC; 2) periodically backing up and buffering updated web site data from the web server client PC; 3) receiving a domain name of a

web site of the web server client PC from a requesting client PC desiring to access the

web site of the web server client PC; and 4) checking whether or not the web server client PC can provide a web service and transmitting network access information of the web site of the web server client PC or network access information of the backup web site of the central server to the requesting client PC according to whether or not the web

server client PC can provide the web service.

In one aspect of the invention, the step 2) includes one of the steps of: 2-1), by

the central server, backing up and buffering the web site data from the web server client PC each time the web site data is updated in the web server client PC; 2-2) backing up

and buffering the web site data from the web server client PC each time the web server

client PC logs into the central server; and 2-3) backing up and buffering the web site

data from the web server client PC at a fixed time everyday.

In addition, the step 4) includes the steps of: 4-1), by the central server,

searching for network access information corresponding to the received domain name;

4-2) accessing the web server client PC and checking whether or not the web server

client PC can provide the web service; 4-3) transmitting the network access information

of the web server client PC to the requesting client PC if the web server client PC can

provide the web service; 4-4) transmitting the network access information of the backup

web site buffered by the central server to the requesting client PC if the web server client PC cannot provide the web service; and 4-5) providing the web service through

the buffered backup web site when the requesting client PC makes a web service request to the central server.

In addition, the step 4-3) includes the steps of: 4-3-1) transmitting an address/path of the central server having information of the web site of the web server

client PC, as network access information, to the requesting client PC if the requesting

client PC inputs a domain name for accessing the web site of the web server client PC; 4-3-2) providing a frame having information of the web site data of the web server client PC when the requesting client PC accesses the central server using the network access

information, whereby the central server allows the web server client PC to provide the

web service even when the web server client PC is inaccessible with the IP address of

the web server client PC alone. In the system and method for providing a dual web service in a web server in a

P2P environment using a central server according to the present invention, when the

requesting client PC requests access to the web site of the web server client PC through

the domain name in the P2P network, the central server determines whether or not the

web server client PC can provide the web service, and transmits network access

information of the web site of the web server client PC to the requesting client PC if the

web server client PC can provide the web service, and transmits network access

information of the backup web site of the central server to the requesting client PC if the web server client PC cannot provide the web service. Thus, there is an advantage in

that, when the web server client PC cannot provide the web service, the central server

provides the web service through the backup web site of the web server client PC buffered in the central server, thereby achieving a stable web service.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other features, aspects, and advantages of preferred embodiments of the present invention will be more fully described in the following detailed description,

taken accompanying drawings. In the drawings: Fig. 1 illustrates a functional structure of a dual web service system according to

an embodiment of the present invention; Figs. 2a and 2b illustrate a functional structure of the dual web service system according to the embodiment of the present invention when a web server client PC can

provide a web service;

Fig. 3 illustrates a functional structure of the dual web service system according to the embodiment of the present invention when the web server client PC cannot

provide a web service; Fig. 4 illustrates the configuration of a web server client PC according to an

embodiment of the present invention;

Fig. 5 illustrates the configuration of a central server according to an

embodiment of the present invention;

Fig. 6 is a flow chart illustrating how the central server operates in a method for

providing a dual web service according to an embodiment of the present invention;

Fig. 7 is a flow chart illustrating how the central server backs up web site data

according to an embodiment of the present invention; Fig. 8 is a flow chart illustrating how the central server transmits network access information according to an embodiment of the present invention; and

Fig. 9 is a flow chart illustrating how the central server transmits network access

information and provides frames according to an embodiment of the present invention.

BEST MODES FOR CARRYING OUT THE INVENTION

Preferred embodiments of the present invention will now be described in detail

with reference to the accompanying drawings. Fig. 1 illustrates a dual web service system according to an embodiment of the present invention. The dual web service system 1 according to the present invention

includes a requesting client PC 2, a web server client PC 3, and a central server 4.

The requesting client PC 2 transmits a domain name of the web server client PC

3 to the central server 4, receives network access information, as a response to the

transmitted domain name, from the central server 4, and accesses the web server client PC 3 or the central server 4 based on the received network access information to receive

a web service through a web site. The network access information is a URL including

an IP address for accessing a web site and downloading data therefrom.

The web server client PC 3 implements therein a web server containing a web site, transmits a service availability state to the central server 5, and backs up data of a

web site of the web server client PC 3 on the central server 5.

The central server 4 registers a domain name corresponding to the web site of

the web server client server PC 3 received from the web server client PC 3 and actual network access information corresponding to the domain name. The central server 4

determines, in real time, whether or not the web server client PC 3 can provide the web

service.

If the web server client PC 3 can provide the web service, the central server 4

transmits the network access information of the web server client PC 3 to the requesting

client PC 2 in response to the domain name transmission from the requesting client PC 2 so that the web server client PC 3 can provide the web service. If the web server

client PC 3 cannot provide the web service, the central server 4 transmits the network access information of the backup web site of the web server client PC 3, which has been

backed up and buffered in the central server 4, to the requesting client PC 2 in response to the domain name transmission from the requesting client PC 2 so that the central

server 4 can provide the web service. Accordingly, the present invention has an

advantage in that the central server 4 can stably maintain the web service of the web server client PC 3 in P2P environments. Fig. 2a illustrates how the central server responds with an IP address of the web

server client PC when the web server client PC can provide the web service in the dual

web service system according to the embodiment of the present invention. In Fig. 2a,

the dual web service system 1 is shown as functioning in the case where the web server

client PC 3 is assigned a unique IP address to allow access from the outside. The requesting client PC 2 transmits the domain name of the web server client

PC 3 to the central server 4, and the central server 4 determines whether or not the web

server client PC 3 can provide the web service. If the web server client PC 3 can

provide the web service, the central server 4 responds to the domain name received from

the requesting client PC 2 by transmitting an IP address of the web server client PC 3, as

network access information, to the requesting client PC 2. The requesting client PC 2

accesses the web site of the web server client PC 3 according to the network access information to receive the web service. Fig. 2b illustrates how the central server responds with its IP address and

provides frames when the web server client PC can provide the web service in the dual web service system according to the embodiment of the present invention. In Fig. 2b, the dual web service system 1 is shown as functioning in the case where the web server client PC 3 is connected to a router so that the web server client PC 3 is not accessible

from the outside with the IP address alone. The requesting client PC 2 transmits the domain name of the web server client

PC 3 to the central server 4, and the central server 4 determines whether or not the web

server client PC 3 can provide the web service. If the web server client PC 3 can

provide the web service, the central server 4 responds to the domain name from the

requesting client PC 2 by transmitting an IP address of the central server 4, as network

access information, to the requesting client PC 2. The requesting client PC 2 accesses the central server 4 according to the network access information, and the central server 4

provides frames, contents of which refer to the web site data of the web server client PC

3, to the request client PC 2. The requesting client PC 2 receives the web service from

the web server client PC 3 through the frames received from the central server 4. Fig. 3 illustrates how the dual web service system functions when the web server

client PC cannot provide the web service according to the embodiment of the present

invention.

If the central server 4 determines that the web server client PC 3 cannot provide the web service, the central server 4 transmits an address/path of the backup web site

data of the web server client PC 3, which has been backed up and buffered in the central

server, as network access information, to the requesting client PC 2. The requesting client PC 2 requests, using the received network access

information, that the central server 4 provide the backup web site data. In response to this request, the central server 4 temporarily substitutes for the web server client PC 3

and provides a dual web service using the backup web site data buffered in the central server 4.

Accordingly, the requesting client PC 2 can receive a stable web service from the backup web site through the central server 4 although the web server client PC 3, which

the requesting client PC 2 desires to access, cannot provide the web service. This

system can be effectively used for web sites of large corporations, large shopping malls,

public offices, governmental agencies, etc. Fig. 4 illustrates the configuration of a web server client PC according to an

embodiment of the present invention. The web server client PC 3 according to the

present invention includes a P2P connection unit 31, a web server unit 32, a web server driving unit 33, and a web site backup unit 34.

When the web server client PC 3 gains access to the central server 4 through the P2P connection unit 31, the web server client PC 3 can share data with other client PCs present on a P2P network implemented with the central server 4.

The web server unit 32 includes a web site and provides the web service to

requesting client PCs 2 that have accessed the web site.

When the web server client PC 3 accesses the central server 4 through the P2P connection unit 31, the web server driving unit 33 automatically drives the web server

unit 32 to switch the web server client PC 3 to a state in which it can provide the web service. The web server driving unit 33 responds, in real time, to an inquiry from the

central server 4 as to whether or not the web server client PC 3 can provide the web service, and transmits a network access path of the web site of the web server unit 32 to

the central server 4. Also when the IP address (for example, a dynamic IP address) of

the web server client PC 3 is changed, the changed IP address is reported, in real time, to the central server 4.

The web server client PC 3 can provide the web service when the web server client PC 3 remains connected to the central server 4 through the P2P connection unit 31

and the web server unit 32 is running. In this state, the web server client PC 3 itself

can process a web site access request received from the requesting client PC 2 and

provide the web site to the requesting client PC 2. However, the web server client PC3

cannot provide the web service when the web server client PC 3 is not connected to the

central server 4, for example, due to network failure or when the web server unit 32 is

not running although the web server client PC 3 remains connected to the central server

4. In this case, the central server 4 substitutes for the web server client PC 3 and provides the web service to the requesting client PC 2. The web site backup unit 34 periodically backs up web site data present in the

web server 32 through the P2P connection unit 31 according to a set condition. Thus,

the original web site data is stored in the web server client PC 3 and the backup web site data is dually stored in the central server 4.

Fig. 5 illustrates the configuration of a central server according to an

embodiment of the present invention. The central server 4 according to the present invention includes a P2P connection processor 41, a URL converter 42, a URL address DB 43, a server buffer 44, a web site backup DB 48, and a dual web server unit 46. The P2P connection processor 41 receives connection requests from client PCs

and allows them to join the P2P network service through login authentication. First, the URL converter 42 stores a domain name set by the web server client

PC 3 and an actual address/path corresponding to the domain name in the URL address

DB 43. Upon receiving the domain name from the requesting client PC 2, the URL

converter 42 obtains actual network connection information corresponding to the domain name with reference to the URL address DB 43, and accesses the web server client PC 3 corresponding to the network access information and checks whether or not

the web server client PC 3 can provide a web service.

When the checked result is that the web server client PC 3 can provide the web

service, the central server 4 transfers the network access information of the web server

client PC 3 to the requesting client PC 2 to allow the requesting client PC 2 to access the

web server client PC 3. Alternatively, the central server 4 transmits its network access

information to the requesting client PC 2, and provides frames to the requesting client

PC 2 when it accesses the central server 4 and then allows the requesting client PC 2 to

receive the web service from the web server client PC 3 through contents of the frames.

When the web server client PC 3 is inoperable, the web server client PC 3

cannot provide the web server, so that network access information of the backup web

site buffered in the central server 4 is transmitted to the requesting client PC 2. The

requesting client PC 2 determines that the received network access information is network access information of the server for providing the web site, and requests access to the backup web site of the central server 4. The central server 4 determines that the

web server client PC 3 cannot provide the web service when the web server unit of the

web server client PC 3 is inoperable or when the web server client PC 3 is powered off

or is not accessible due to network failure. The dual web server unit 46 of the central server 4 receives the web site request

of the requesting client PC 2, and provides the web service by providing the backup web

site of the web server client PC 3, already buffered in the central server 4.

Web site data for backup, uploaded by the web site backup unit 34 of the web server client PC 3, is transmitted to the central server 4, and the server buffer of the

central server 4 updates backup web site data in the web site backup DB 45 with that

received from the web server client PC 3.

The dual web service system 1 according to the present invention has been

described with reference to the procedure in which the requesting client PC 2 accesses the web site of the web server client PC 3 or the backup web site of the central server 4.

However, the dual web service system 1 according to the present invention can also be

implemented in a different manner in which the requesting client PC 2 can

automatically receive the web service in real time through the web site of the central

server 4 when the web server client PC 3 abruptly becomes unable to provide the web

service while the requesting client PC 2 is receiving the web service through the web

server client PC 3.

The real-time dual web service through the change of the server for providing

the web site is provided in such a manner that the central server 4 receives the domain name from the requesting client PC 2, checks whether or not the web server client PC 3

can provide the web service, and transmits network access information of the web server

client PC 3 or the central server 4 to the requesting client PC 2 according to the checked

result. Alternatively, the real-time dual web service can be provided in the following

manner. Regardless of the transmission of the domain name from the requesting client

PC 2, the central server 4 checks, in real time, whether or not the web server client PC 3 can provide the web service, and converts the network access information to an address

of the backup web site data buffered in the central server, so as to provide, in real time, network access information, which is always ready to provide the web service, to the

requesting client PC 2.

Fig. 6 is a flow chart illustrating how the central server operates in a method for

providing a dual web service according to an embodiment of the present invention. At step S10, which is a process of registering a domain name and network access

information, the central server 4 receives and stores actual network access information

of the web site and a domain name set by the web server client PC 3. The central

server 4 acts as a domain name server.

At step S20, which is a process of buffering web site data, the central server 4 periodically receives web site data from the web server client PC 3 so that the central

server 4 provides a substitute web service through the backup web site buffered in the

central server 4 when the web server client PC 3 cannot provide the web service. At step S30, which is a process of receiving a domain name, the central server 4

receives the domain name of the web server client PC 3 from the requesting client PC 2. At step S40, which is a process of transmitting network access information, the

central server 4 accesses the web server client PC 3 and checks whether or not the web server client PC 3 can provide the web service. The central server 4 transmits network

access information of the web server client PC 3 to the requesting client PC 2 if the result of the check is that the web server client PC 3 can provide the web service, and

transmits network access information of the central server 4 to the requesting client PC 2 if the web server client PC 3 cannot provide the web service. In the case where the

central server 4 previously sets network access information by checking, in real time, whether or not the web server client PC 3 can provide the web service, the central server 4 immediately responds with suitable network access information corresponding to the domain name transmitted from the requesting client PC 2.

Fig. 7 is a flow chart illustrating how the central server backs up web site data

according to an embodiment of the present invention. The user can arbitrarily set the time to back up web site data, for example, as in

one of the following steps.

At step S21, which is a process of backing up web site data during update, the

web server client PC 3 automatically uploads web site data to the central server 4 so that

the web site data is backed up on the central server 4 when the user of the web server

client PC 3 changes the web site data.

At step S22, which is a process of backing up web site data during login, the web

server client PC 3 automatically uploads web site data to the central server 4 when the

web server client PC 3 accesses the central server 4 and is subjected to a login

authentication process. At step S23, which is a process of backing up web site data at a fixed time, the

web server client PC 3 automatically uploads web site data to the central server 4 at a specific time set by the user everyday.

It is also desirable that the three steps S21 to S23 be used in conjunction to maintain match of the web site data. Fig. 8 is a flow chart illustrating how the central server transmits network access information according to an embodiment of the present invention.

At step S41 , which is a process of searching for network access information in the central server 4, the central server 4 searches for and finds network access information corresponding to a received domain name.

At step S42, which is a process of checking whether or not the web server client

PC 3 can provide the web service, the central server 4 accesses the web server client PC

3 based on the network access information found at step S41, and checks whether or not

the web service can be provided through the web site of the web server client PC 3. If the central server 4 can access the web server client PC 3 over the network and the web

server unit of the web server client PC 3 is running, the central server 4 determines that

the web server client PC 3 can provide the web service, otherwise the central server 4

determines that the web server client PC 3 cannot provide the web service. If the web server client PC 3 can provide the web service, the central server 4

transmits network access information of the web server client PC 3 to the requesting

client PC 2 at step S43. The requesting client PC 2 receives the web service through

the web site of the web server client PC 3 based on the received network access

information. If the web server client PC 3 cannot provide the web service, the central server 4

transmits network access information of a backup web site of the web server client PC, buffered in the central server 4, to the requesting client PC 2 at step S44. Upon

receiving a web site access request from the requesting client PC 2, the central server 4

provides the web service through the buffered backup web site at step S45 which is a

process of providing the web service. Fig. 9 is a flow chart illustrating how the central server transmits network access

information and provides frames according to an embodiment of the present invention. If the web server client PC 3 can provide the web service but the web server client PC 3 cannot be accessed properly with its IP address alone at step S43 which is

the process of transmitting network access information,, the central server 4 transmits

frames as follows, thereby making it possible to refer to proper data.

At step S431 , which is a process of transmitting an address/path of the central

server as network access information, the central server 4 transmits its network access

information to the requesting client PC 2 in response to the received domain name.

The requesting client PC 2 accesses the central server 4 based on the received network access information.

At step 432, which is a process of providing frames, the central server 4 provides

empty frames containing information of the contents of the web site of the web server client PC 3 to the requesting client PC 2. Web site data is received from the web

server client PC 3 to display the contents in the frames.

Accordingly, even if it is difficult to determine a proper address/path of

the web site of the web server client PC 3 with its IP address alone, for example, even if the web server client PC 3 is assigned the same IP address as other client PCs through a

router, the frame transmission makes it possible for the information in the frames to refer to the web site data from the web server client PC 3.

The present invention has been described in detail. However, it should be

understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will

become apparent to those skilled in the art from this detailed description. INDUSTRIAL APPLICABILITY

In a system and method for providing a dual web service in a central server in a

P2P environment using a central server, the central server provides a service to change a domain name to actual network access information for client PCs, so that a specific one

of the client PCs serves as a web server having a domain name.

If the web server client PC is inoperable, the central server transmits network

access information of the central server, as network access information corresponding to

the domain name, to the requesting client PC, and provides the web service through a

backup web site from the web server client PC, buffered in the central server, thereby

achieving a continuous web service through a dual web service operation of the central

server responsible for the web server function.

Claims

What is claimed is;
1. A dual web service system supporting a web service function of individual
client PCs (personal computers) in a P2P (peer-to-peer) environment, the system comprising: a requesting client PC for transmitting a domain name of a web server client PC
to a central server in order to access a web site of the web server client PC and to
request data from the web server client PC, receiving actual network access information
of the web site corresponding to the domain name from the central server, and accessing the web site using the network access information to receive a web service; the web server client PC including the web site implemented therein, accessing
the central server to register the domain name and the actual network access information
of the web site, periodically backing up data of the web site on the central server, and
providing the web service through the web site upon receiving a web service request from the requesting client PC; and the central server checking, in real time, whether or not the web server client PC
can provide the web service, buffering a backup web site received from the web server
client PC, receiving the domain name from the requesting client PC, transmitting the network access information of the web server client PC if the web server client PC can provide the web service, and transmitting network access information of the backup web
site if the web server client PC cannot provide the web service, wherein, if the web server client PC cannot provide the web service, the central server provides, in real time, a web service, associated with the access to the web site and the request for the data, to the requesting client PC through the buffered web site.
2. The dual web service system according to claim 1, wherein the web server
client PC comprises: a P2P connection unit for logging into the central server and maintaining
connection to the central server; a web server unit for providing a web service through a web site; a web server driving unit for automatically driving the web server unit when
logging into the central server through the P2P connection unit, and transmitting both a
web service availability state of the web server unit and a network access path of the
web site of the web server unit to the central server; and a backup unit for automatically accessing the central server to back up data of
the web site of the web server unit on the central server.
3. The dual web service system according to claim 1, wherein, if the requesting
client PC inputs a domain name for accessing the web site of the web server client PC
when the web server client PC can provide the web service, the central server transmits an IP address of the web server client PC corresponding to the input domain name or an address/path of the central server having information of the web site of the web server
client PC, as network access information, to the requesting client PC, and when the requesting client PC accesses the central server using the address/path
of the central server, the central server provides a frame having information of the web site data of the web server client PC, whereby the central server allows the web server client PC to provide the web
service through the frame even when the web server client PC is inaccessible with the IP
address of the web server client PC alone.
4. The dual web service system according to claim 1 , wherein the central server
comprises: a P2P connection processor for processing P2P access requests from a plurality
of client PCs; a URL converter for receiving and storing a domain name and actual network
access information from the web server client PC, receiving a domain name from the
requesting client PC, checking whether or not the web server client PC can provide the
web service, and transmitting, in real time, network access information of the web
server client PC or network access information of the central server to the requesting
client PC according to whether or not the web server client PC can provide the web
service; a URL address DB for receiving and storing a domain name and an IP address/path of the web server client PC from the URL converter; a server buffer for buffering backup data of an updated web site received from
the web server client PC; a web site backup DB for storing the backup web site data buffered by the server buffer; and a dual web server unit for substituting for the web server client PC and providing the web service through the web site stored in the web site backup DB when the web server client PC cannot provide the web service.
5. The dual web service system according to claim 1 or 4, wherein the central
server determines that the web server client PC cannot provide the web service when the
web server unit of the web server client PC is inoperable or when the web server client PC is powered off or is not accessible due to network failure after the central server
receives a domain name of a web, site from the requesting client PC and accesses the
web server client PC using network access information including an actual address of
the web site.
6. The dual web service system according to claim 1 or 4, wherein the central
server checks, in real time, whether or not the web server client PC can provide the web
service, converts the network access information to an address of the backup web site
data buffered by the central server if the web server client PC cannot provide the web service, and the central server converts the network access information to an actual address of
the web site data of the web server client PC if the web server client PC can provide the
web service, whereby, upon receiving a web site data request, including the domain name of
the web server client PC, from the web server client PC, the central server provides, in
real time, network access information, which is always ready to provide the web service,
to the requesting client PC.
7. A dual web service method in a central server supporting a web service
function of individual client PCs in a P2P environment, the method comprising the steps
of:
1 ), by the central server, receiving and storing actual network access information
including an IP address and a domain name from a web server client PC;
2) periodically backing up and buffering updated web site data from the web
server client PC;
3) receiving a domain name of a web site of the web server client PC from a
requesting client PC desiring to access the web site of the web server client PC; and 4) checking whether or not the web server client PC can provide a web service
and transmitting network access information of the web site of the web server client PC
or network access information of the backup web site of the central server to the
requesting client PC according to whether or not the web server client PC can provide
the web service.
8. The dual web service method according to claim 7, wherein the step 2)
includes one of the steps of:
2-1), by the central server, backing up and buffering the web site data from the
web server client PC each time the web site data is updated in the web server client PC; 2-2) backing up and buffering the web site data from the web server client PC each time the web server client PC logs into the central server; and 2-3) backing up and buffering the web site data from the web server client PC at a fixed time everyday.
9. The dual web service method according to claim 7, wherein the step 4) includes the steps of:
4-1), by the central server, searching for network access information
corresponding to the received domain name; 4-2) accessing the web server client PC and checking whether or not the web server client PC can provide the web service;
4-3) transmitting the network access information of the web server client PC to
the requesting client PC if the web server client PC can provide the web service;
4-4) transmitting the network access information of the backup web site buffered by the central server to the requesting client PC if the web server client PC cannot
provide the web service; and
4-5) providing the web service through the buffered backup web site when the requesting client PC makes a web service request to the central server.
10. The dual web service method according to claim 9, wherein the step 4-3) includes the steps of: 4-3-1) transmitting an address/path of the central server having information of
the web site of the web server client PC, as network access information, to the requesting client PC if the requesting client PC inputs a domain name for accessing the web site of the web server client PC; 4-3-2) providing a frame having information of the web site data of the web
server client PC when the requesting client PC accesses the central server using the network access information, whereby the central server allows the web server client PC to provide the web
service even when the web server client PC is inaccessible with the IP address of the web server client PC alone.
PCT/KR2004/002220 2004-05-29 2004-09-02 Dual web server system and method using host server in p2p web server configuration WO2005116855A1 (en)

Priority Applications (2)

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KR1020040038756A KR100496172B1 (en) 2004-05-29 2004-05-29 Dual web service system using host server in p2p web server configuration

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