JPWO2014119180A1 - Content relay apparatus, content relay method, and content relay program - Google Patents

Abstract

Before the upload to the content server is completed, the content can be downloaded using the official storage location specifying information (for example, URI). A content relay device that relays content uploaded from an upload request source to a content server, and obtains identification information given to the content registered in the content server from the content server before the actual registration of the content If the download request source is notified and a download request for the content specified by the identification information is received from the download request source, the content relay device even before the content is registered in the content server The content that has been buffered is distributed to the download request source.

Description

  The present invention relates to a content relay apparatus, a content relay method, and a content relay program.

With the spread of FTTH (Fiber To The Home), a data communication service for homes using optical fibers, broadband access lines have been increasing. In mobile communication services, HSPA (High Speed Packet Access), LTE (Long Term), which have already been introduced.
(Evolution) is leading to wider broadband access lines, and the introduction of LTE-Advanced and WiMAX2 (Worldwide Interoperability for Microwave Access 2) standards for next-generation mobile communications (4th generation communications) Capacity communication will be possible.

  With the development of network services and wider bandwidth, various daily information exchanges can be easily performed via the network. For example, video content that was once recorded in analog form has been digitized, uploaded to a content server by an information provider, and can be easily delivered to viewers via a network. In particular, in recent years, with the spread of camera-equipped terminals such as smartphones and tablet PCs (Personal Computers), the number of users who upload still images and video content captured by the terminals to content servers and exchange information has increased.

  Representative examples of such applications include VoD (video on demand), online storage, and SNS (social networking service). VoD is a service that can be viewed when a user wants to view various video contents registered by an information provider. Online storage is a service that lends the disk space of a content server to users. Users can freely read and write to the allocated disk space via the network, and can also share and publish content. SNS is a community-type Web site that promotes and supports connections between people, and also functions as a content server that shares and publishes content.

  However, in these applications, there is a problem that it takes a long time for the content upload processing of the terminal due to delay or congestion of the network or server.

  The information provider would like to upload the content quickly and provide the content quickly to the user, and it would be nice if the user side could also access the content comfortably. And of course, telecommunications carriers and ISPs (Internet service providers) will want to provide users with a comfortable content transmission path.

  Cache technology is used for this purpose. In order to make a device that takes a long time to access appear at high speed, the cache temporarily stores information accessed once in a high-speed memory, and accesses the same device the second time when accessing the same information. Instead, the temporary stored contents are accessed. For example, instead of the CPU chip actually accessing the memory, a faster memory is built into the CPU chip and used as a cache, or frequently when the operating system accesses the disk drive. The data to be accessed is not actually accessed to the disk drive, but is cached in a semiconductor memory faster than that, and is used at various locations in various information processing devices.

  There is a cache server as an application example of the cache technology. The cache server stores a copy of the content provided on the network, and distributes the content in place of the original content server when requested by the user. By installing the cache server in the vicinity of the terminal on the network, it is possible to reduce the access time to the content and the load on the network server. Many conventional cache servers aim to reduce the access time when accessing the same content for the second time, but in recent years, cache servers aiming to shorten the upload time in addition to downloading have been seen.

  For example, Non-Patent Document 1 proposes a cache server technology that speeds up uploading. Specifically, a cache server is installed near a terminal on the network such as a wireless LAN (local area network) access point, and upload traffic is buffered. Thus, the terminal can finish the upload process quickly even when the network server is congested. Further, after uploading to the content server is completed, the cached content can be acquired from the cache server.

  Further, for example, in Patent Document 1, when transmitting a large-capacity content such as a video, the content is first temporarily registered in the content server, and then the main registration is performed. Content upload processing time can be shortened. In content temporary registration, content metadata (for example, information related to content such as creation date, creator, data format, title, and annotation) is registered with the content server, and authentication of the user who registers the information, Confirmation of the registration authority of the user to the content server and confirmation of free space for registering information in the content server. If there is an acquisition request for the content after provisional registration, the acquisition request is redirected to the upload terminal via the content server and distributed from the upload terminal. After the main registration of content, it is distributed from the content server.

JP 2002-351784 A

Yuncheng Zhu, Akihiro Nakao, "Upload Cache in EdgeNetworks", Proceedings of the 2012 IEEE 26th International Conference on Advanced Information Networking and Applications (AINA'12), pp.307-313, March2012

  The first problem is that the technology of Non-Patent Document 1 cannot obtain the formal URI of the content before the completion of uploading to the content server and notify the terminal. The content cannot be downloaded by URI.

  The reason is that it is configured to operate as a cache server after uploading to the content server is completed.

  The second problem is that the technology of Patent Document 1 can acquire the formal URI of the content and notify the terminal before completion of uploading to the content server without giving the terminal and the content server a special function. In other words, the terminal cannot download the content with the official URI before the upload to the content server is completed.

  The reason is that the terminal registers content metadata with the content server, and the content server authenticates the user who uploads the content, confirms the registration authority of the user to the content server, and registers information in the content server. This is because it is necessary to check the free space for performing the content, and a terminal and content server specialized for the content temporary registration function are required.

[Object of invention]
An object of the present invention is to enable downloading of content using formal storage location specifying information (for example, URI) before uploading is completed.

  The content relay device of the present invention is a content relay device that relays content uploaded from the upload request source to the content server, and uses the identification information given to the content registered in the content server as the actual content of the content. Obtained from the content server prior to registration and notified to the download request source, and upon receiving a download request for content specified by the identification information from the download request source, before registration of the content to the content server Even if it exists, the content buffered in the content relay device is distributed to the download request source.

  The content relay method of the present invention is a content relay method for relaying content uploaded from an upload request source to a content server, and the identification information given to the content registered in the content server is used as the actual content of the content. Obtained from the content server prior to registration and notified to the download request source, and upon receiving a download request for content specified by the identification information from the download request source, before registration of the content to the content server Even if it exists, the content buffered in the content relay device is distributed to the download request source.

  The content relay program of the present invention is a content relay program for causing a computer to function as a content relay device that relays content uploaded from an upload request source to a content server, and the computer is registered in the content server. The identification information given to the content to be acquired is acquired from the content server before the content is actually registered and notified to the download request source, and the download request of the content specified by the identification information from the download request source In response to this, even before the content is registered in the content server, the content buffered in the content relay device is made to function as a means for distributing to the download request source.

  According to the present invention, content can be downloaded using formal storage location specifying information (for example, URI) before uploading is completed.

It is a block diagram which shows the structure of the content relay system in the 1st and 2nd embodiment of this invention. It is a sequence diagram which shows operation | movement of the content relay system in the 1st Embodiment of this invention. It is a sequence diagram which shows operation | movement of the content relay system in the 2nd Embodiment of this invention. It is a sequence diagram which shows the specific example of operation | movement of the content relay system in the 1st Embodiment of this invention.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

[First embodiment of the present invention]

  Referring to FIG. 1, a content relay system 10 according to a first embodiment of the present invention includes a content relay device 100, a content server 200, an upload terminal 300, a download terminal 310, a WAN (Wide Area Network), a dedicated line, And a communication network 400 including access lines (FTTH, ADSL, 3G, LTE, WiMAX, WiFi, etc.).

  In the present embodiment, the content server 200 can be a computer having a Web server function. The content server 200 assigns specific storage location specifying information (for example, URI) to the uploaded content, and accumulates the content data in a location specified by the storage location specifying information. This accumulation of content data is also referred to as “content registration”. This unique storage location specifying information provided by the content server 200 is also referred to as “official” storage location specifying information. When the content registration is completed, the content server 200 notifies the content relay apparatus 100 of the official storage location specifying information. Thereafter, the content relay apparatus 100 transmits the storage location specifying information together with the content data to the content server 200, so that the content server 200 overwrites the received content data on the location specified by the storage location specifying information.

  The upload terminal 300 and the download terminal 310 can be various electronic devices such as a personal computer (PC) having a Web browsing function, a smartphone, a tablet PC, and a notebook PC.

  In the present embodiment, a configuration in which the upload terminal 300 registers content in the content server 200 via the content relay device 100 and the download terminal 310 acquires content via the content relay device 100 will be described. . In the following description, a URI representing a location of content in the content server 200 is used as the storage location specifying information.

In this embodiment, the above-described problem is solved by having the following functions.
The content relay apparatus 100 buffers and relays content upload traffic from the upload terminal 300 to the content server 200.
When the upload terminal 300 starts uploading to the content server 200, the content relay apparatus 100 registers dummy content of a small size or zero size in the content server 200 and responds to the “storage location specifying information” from the content server 200. Get the official URI.
The content relay apparatus 100 performs the main content registration so that the dummy content is overwritten after the dummy content is registered.
The content relay apparatus 100 notifies the upload terminal 300 of the official URI even if the content registration to the content server 200 is not completed.
When the download terminal 310 transmits a content acquisition request with a formal URI, the content relay apparatus 100 operates as a cache server and transmits content to the download terminal 310 even if content registration in the content server 200 is not completed. To do.

[Configuration of Content Relay Device 100]
Referring to FIG. 1, the content relay apparatus 100 includes an upload relay unit 101, a URI pre-acquisition unit 102, a URI pre-notification unit 103, and a content cache unit 104. Also, a means for receiving and buffering the uploaded content is provided (not shown).

  The upload relay unit 101 has a function of buffering and relaying upload traffic from the upload terminal 300 to the content server 200.

  The URI pre-acquisition means 102 has a function of registering a sufficiently small size or zero size dummy content in the content server 200 and securing a formal URI.

  The URI prior notification means 103 has a function of notifying the upload terminal 300 of a formal URI even if content registration from the upload terminal 300 to the content server 200 is not completed.

  Even if the content registration from the upload terminal 300 to the content server 200 has not been completed, the content cache unit 104 receives a request for the content being buffered and relayed by the upload relay unit 101 from the download terminal 310 and receives the content. It has a function of transmitting to the download terminal 310.

[Operation of First Embodiment]
Next, the operation of the content relay system 10 in the present embodiment will be described in detail with reference to the configuration diagram of FIG. 1 and the sequence diagram of FIG.

  When the upload terminal 300 starts content registration with the content server 200 (S1), the content relay apparatus 100 starts receiving this upload data and buffers it (S2).

  The content relay apparatus 100 registers dummy content having a sufficiently small size or zero size in the content server 200 (S4). The dummy content may be, for example, a thumbnail of content or zero-size data.

  Upon receiving the dummy content, the content server 200 generates a URI and registers the dummy content (S5).

  The content server 200 returns a dummy content upload completion response including the generated URI to the content relay apparatus 100 (S6). The content relay apparatus 100 acquires a URI (hereinafter simply referred to as “acquired URI”) included in this response.

  When the content relay apparatus 100 completes reception of the upload data from the upload terminal 300, the content relay apparatus 100 returns a response of content upload completion including the acquired URI to the upload terminal 300 (S3). Then, the content cache information is registered in association with the acquired URI (S8). Upon receiving the content upload completion response, the upload terminal 300 notifies the download terminal 310 of the acquired URI via, for example, an email or a website (S7).

  The content relay apparatus 100 starts content registration so as to overwrite the dummy content registered in the acquired URI of the content server 200 (S9). When the content registration is completed, the content server 200 returns a content upload completion response to the content relay device 100 (S11).

  After the registration of the cache information (S8), when the download terminal 310 transmits an acquisition request for the content of the acquisition URI (S12), the content relay apparatus 100 even before the content upload to the content server 200 is completed (S11). Relays the acquisition request, determines that the target of the acquisition request is the content registered in the cache, and starts transmitting content data to the download terminal 310 (S13). When the transmission of the content data is completed, a response is returned from the content relay device 100 to the download terminal 310 (S14).

[Effect of the first embodiment]
According to the present embodiment, it is possible to realize distribution by a formal URI for content that has not been uploaded from the upload terminal 300 to the content server 200. The reason is that the content relay apparatus 100 relays the upload traffic from the upload terminal 300 to the content server 200, acquires the formal URI immediately after the upload starts, and notifies the upload terminal 300 of it. Then, when a content download request for the official URI arrives from the download terminal 310 before the upload is completed, the content is distributed from the content relay device 100.

  Further, according to the present embodiment, the terminal (300, 310) that requests upload or download and the content server 200 are not given special functions, and the content that has not been uploaded to the content server 200 is officially Download distribution by simple URI can be realized. The reason is that the upload terminal 300 uploads content as usual, and the content server 200 only has to accept content registration as usual, so the terminals (300, 310) and the content server 200 need to have special functions. Because there is no.

[Second embodiment of the present invention]
Next, a second embodiment of the present invention will be described with reference to the configuration diagram of FIG. 1 and the sequence diagram of FIG. In the present embodiment, before the upload terminal 300 starts content upload (S21), the content relay apparatus 100 acquires a formal URI from the content server 200 in advance (S24, S25, S26), and uploads. It is characterized by preventing a decrease in response to the terminal 300 and the download terminal 310.

  The URI pre-acquisition means 102 is similar to the first embodiment in that it has a function of securing a formal URI by registering sufficiently small size or zero size dummy content in the content server 200. The timing for obtaining the formal URI is different. Specifically, the URI pre-acquisition unit 102 acquires a formal URI from the content server 200 in advance, and always reserves a single URI or a plurality of URIs. Then, when the upload terminal 300 starts upload registration, the traffic is relayed and the content is registered so as to overwrite one of the URIs reserved in advance. Therefore, it becomes possible to respond to the upload terminal 300 without causing a delay due to obtaining a formal URI.

  According to the present embodiment, in addition to the effects obtained in the first embodiment, the content relay device acquires a formal URI from the content server in advance before the upload terminal starts content upload. Thus, it is possible to prevent a decrease in response to the upload terminal and the download terminal. In addition, the processing time for uploading content from the upload terminal to the content server can be shortened.

  Next, the operation of the embodiment for carrying out the present invention will be described using specific examples. The overall operation of the present embodiment will be described in detail with reference to the configuration diagram of FIG. 1 and the sequence diagram of FIG.

In FIG. 4, as an example, IETF (Internet Engineering Task Force) RFC 2616 (Request
For Comment 2616) HTTP / 1.1 (Hyper
The operation when Text Transfer Protocol Version 1.1) is used is shown.

  When the upload terminal 300 starts content registration with the content server 200 by HTTP POST (S41), the content relay apparatus 100 starts receiving and uploading the upload data (S42).

  The content relay apparatus 100 registers a sufficiently small size or zero size dummy content in the content server 200 by HTTP POST (S44). The dummy content may be, for example, a thumbnail of content or zero-size data.

  Upon receiving the dummy content, the content server 200 generates a URI and registers the dummy content (S45).

  The content server 200 returns a dummy content upload completion response including the generated URI to the content relay apparatus 100 as HTTP 200 OK (S46). The URI is described in 200 OK, for example, in the Location header field. The content relay apparatus 100 acquires a URI (hereinafter simply referred to as “acquired URI”) included in this response.

  When the content relay apparatus 100 completes reception of the upload data of the upload terminal 300, the content relay completion response including the acquired URI is returned to the upload terminal 300 as HTTP 200OK (S43). The acquisition URI is described in 200 OK, for example, in the Location header field. Then, the content cache information is registered in association with the acquired URI (S48). Upon receiving the content upload completion response, the upload terminal 300 notifies the download terminal 310 of the acquired URI via e-mail or a website, for example (S47).

  The content relay apparatus 100 starts content registration using the HTTP PUT so as to overwrite the dummy content registered in the acquired URI of the content server 200 (S49). At this time, the acquired URI is described in the PUT, for example, in the Request-URI header field. When the content registration is completed, the content server 200 returns a content upload completion response as 200 OK to the content relay apparatus 100 (S51). The content registration start (S49) to the content server 200 does not necessarily have to be executed at the timing shown in FIG. 4 after the dummy content registration is completed (S46). For example, when the content server 200 is congested, the process may be started after waiting for a certain time in order to avoid the congestion, or may be started after it is available.

  After the cache information registration (S48), when the download terminal 310 transmits an HTTP GET as an acquisition request for the content of the acquisition URI (S52), the content is displayed even before the content upload to the content server 200 is completed (S51). The relay device 100 relays the acquisition request, determines that the content is registered in the cache, and starts transmitting content data to the download terminal 310 (S53). When the transmission of the content data is completed, a response is returned from the content relay apparatus 100 to the download terminal 310 (S54).

  The content relay apparatus and system described above can be realized by hardware, software, or a combination thereof. Further, the content relay method performed by the content relay device or system described above can also be realized by hardware, software, or a combination thereof. Here, “realized by software” means realized by a computer reading and executing a program.

  The program may be stored using various types of non-transitory computer readable media and supplied to a computer. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-ROMs. R, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (random access memory)). The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
A content relay device that relays content uploaded from an upload request source to a content server, and obtains identification information given to the content registered in the content server from the content server before the actual registration of the content If the download request source is notified and a download request for the content specified by the identification information is received from the download request source, the content relay device even before the content is registered in the content server A content relay apparatus that distributes the content buffered to a download request source.

(Appendix 2)
The content relay apparatus according to appendix 1, wherein the identification information is information for specifying a storage location of the content.

(Appendix 3)
Buffering means for receiving and buffering the uploaded content from the upload request source;
Reservation means for reserving registration of content in the content server with the content server and acquiring storage location specifying information for specifying a location where the content is stored by the content server;
The content buffered by the buffering means is transmitted to the content server, the content is stored in the storage location specified by the storage location specifying information acquired by the reservation means, and the content is stored in the content server. Registration means for requesting to register with the server;
Notification means for notifying the download request source of the storage location specifying information acquired by the reservation means;
If the download request of the content stored in the storage location specified by the storage location specifying information is received from the download request source before the registration of the content at the request of the registration means is completed, the storage location specifying information Distribution means for distributing buffered content corresponding to the content stored in the specified storage location to the download request source;
The content relay device according to appendix 1 or 2, characterized by comprising:

(Appendix 4)
The reservation unit transmits dummy content to the content server, registers the content in the content server, and obtains storage location specifying information added to the dummy content from the content server by the content server. 4. The content relay device according to 3.

(Appendix 5)
The registration unit transmits the content buffered by the buffering unit to the content server, and the content server overwrites the dummy content registered in the content server with the content. The content relay device according to appendix 4.

(Appendix 6)
The reservation means reserves content registration in the content server with the content server before receiving an upload request from the upload request source, and specifies a location where the content is stored by the content server 6. The content relay apparatus according to any one of appendices 3 to 5, wherein the specific information is acquired.

(Appendix 7)
7. The content relay device according to any one of appendices 3 to 6, wherein the storage location specifying information is a URI (Uniform Resource Identifier) indicating a storage location of the content.

(Appendix 8)
8. A content relay system comprising the content relay device according to any one of appendices 1 to 7, and a content server, an upload terminal, and a download terminal connected to the content relay device via a communication network.

(Appendix 9)
A content relay method for relaying content uploaded to a content server from an upload request source, wherein identification information given to the content registered in the content server is acquired from the content server before the actual registration of the content If the download request source is notified and a download request for the content specified by the identification information is received from the download request source, the content relay device even before the content is registered in the content server A content relay method comprising: distributing the content buffered to a download request source.

(Appendix 10)
The content relay method according to appendix 9, wherein the identification information is information for specifying a storage location of the content.

(Appendix 11)
A buffering step of receiving and buffering the uploaded content from the upload request source;
A reservation step of reserving content registration in the content server with the content server and acquiring storage location specifying information for specifying a location where the content is stored by the content server;
Transmitting the content buffered by the buffering means to the content server, storing the content in the storage location specified by the storage location specifying information acquired in the reservation step, and the content server; A registration step requesting registration on the content server;
A notification step of notifying the download request source of the storage location specifying information acquired in the reservation step;
When the download request for the content stored in the storage location specified by the storage location specifying information is received from the download request source before the registration of the content by the request in the registration step is completed, the storage location specifying information A distribution step of distributing the buffered content corresponding to the content stored in the storage location specified by the download request source;
The content relay method according to appendix 9 or 10, characterized by comprising:

(Appendix 12)
In the reservation step, dummy content is transmitted to the content server and registered in the content server, and storage location specifying information given to the dummy content is acquired from the content server by the content server. 11. The content relay method according to 11.

(Appendix 13)
In the registration step, the content buffered in the buffering step is transmitted to the content server, and the content server overwrites the dummy content registered in the content server with the content. The content relay method according to Supplementary Note 12.

(Appendix 14)
In the reservation step, before receiving an upload request from the upload request source, a storage location for reserving content registration in the content server with the content server and specifying a location where the content is stored by the content server 14. The content relay method according to any one of appendices 11 to 13, wherein specific information is acquired.

(Appendix 15)
15. The content relay method according to any one of appendices 11 to 14, wherein the storage location specifying information is a URI (Uniform Resource Identifier) representing a storage location of the content.

(Appendix 16)
A content relay program for causing a computer to function as a content relay device that relays content uploaded from an upload request source to a content server,
The computer,
The identification information given to the content registered in the content server is acquired from the content server and notified to the download request source before the actual registration of the content, and specified by the identification information from the download request source. In order to function as a means for distributing the content buffered in the content relay device to the download request source even when the content download request is received before the content is registered in the content server Content relay program.

(Appendix 17)
The content relay program according to appendix 16, wherein the identification information is information for specifying a storage location of the content.

(Appendix 18)
Said computer further
Buffering means for receiving and buffering the uploaded content from the upload request source;
Reservation means for reserving registration of content in the content server with the content server and acquiring storage location specifying information for specifying a location where the content is stored by the content server;
The content buffered by the buffering means is transmitted to the content server, the content is stored in the storage location specified by the storage location specifying information acquired by the reservation means, and the content is stored in the content server. Registration means for requesting to register with the server;
Notification means for notifying the download request source of the storage location specifying information acquired by the reservation means;
If the download request of the content stored in the storage location specified by the storage location specifying information is received from the download request source before the registration of the content at the request of the registration means is completed, the storage location specifying information Distribution means for distributing buffered content corresponding to the content stored in the specified storage location to the download request source;
The content relay program according to appendix 16 or 17, wherein the content relay program is made to function as:

(Appendix 19)
The reservation unit transmits dummy content to the content server, registers the content in the content server, and obtains storage location specifying information added to the dummy content from the content server by the content server. 18. The content relay program according to 18.

(Appendix 20)
The registration unit transmits the content buffered by the buffering unit to the content server, and the content server overwrites the dummy content registered in the content server with the content. The content relay program according to appendix 19.

(Appendix 21)
The reservation means reserves content registration in the content server with the content server before receiving an upload request from the upload request source, and specifies a location where the content is stored by the content server The content relay program according to any one of appendices 18 to 20, wherein the specific information is acquired.

(Appendix 22)
The content relay program according to any one of appendices 18 to 21, wherein the storage location specifying information is a URI (Uniform Resource Identifier) indicating a storage location of the content.

  This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2013-014342 for which it applied on January 29, 2013, and takes in those the indications of all here.

  The present invention can be applied to various daily information exchanges in services such as VoD (video on demand), online storage (SNS), and social networking service (SNS). The present invention can also be applied to a case where information is exchanged by uploading a still image or a moving image content captured by a camera-equipped terminal such as a smartphone or a tablet PC (Personal Computer) to a server.

DESCRIPTION OF SYMBOLS 10 Content relay system 100 Content relay apparatus 101 Upload relay means 102 URI prior acquisition means 103 URI prior notification means 104 Content cache means 200 Content server 300 Upload terminal 310 Download terminal 400 Communication network

Claims (10)

  A content relay device that relays content uploaded from an upload request source to a content server, and obtains identification information given to the content registered in the content server from the content server before the actual registration of the content If the download request source is notified and a download request for the content specified by the identification information is received from the download request source, the content relay device even before the content is registered in the content server A content relay apparatus that distributes the content buffered to a download request source.   The content relay apparatus according to claim 1, wherein the identification information is information for specifying a storage location of the content. Buffering means for receiving and buffering the uploaded content from the upload request source;
Reservation means for reserving registration of content in the content server with the content server and acquiring storage location specifying information for specifying a location where the content is stored by the content server;
The content buffered by the buffering means is transmitted to the content server, the content is stored in the storage location specified by the storage location specifying information acquired by the reservation means, and the content is stored in the content server. Registration means for requesting to register with the server;
Notification means for notifying the download request source of the storage location specifying information acquired by the reservation means;
If the download request of the content stored in the storage location specified by the storage location specifying information is received from the download request source before the registration of the content at the request of the registration means is completed, the storage location specifying information Distribution means for distributing buffered content corresponding to the content stored in the specified storage location to the download request source;
The content relay device according to claim 1, further comprising:   The reservation unit transmits dummy content to the content server, registers the content in the content server, and acquires storage location specifying information added to the dummy content from the content server by the content server. Item 4. The content relay device according to Item 3.   The registration unit transmits the content buffered by the buffering unit to the content server, and the content server overwrites the dummy content registered in the content server with the content. The content relay device according to claim 4.   The reservation means reserves content registration in the content server with the content server before receiving an upload request from the upload request source, and specifies a location where the content is stored by the content server 6. The content relay apparatus according to claim 3, wherein the specific information is acquired.   The content relay apparatus according to claim 3, wherein the storage location specifying information is a URI (Uniform Resource Identifier) representing a storage location of the content.   8. A content relay comprising: the content relay device according to claim 1; and a content server, an upload terminal, and a download terminal connected to the content relay device via a communication network. system.   A content relay method for relaying content uploaded to a content server from an upload request source, wherein identification information given to the content registered in the content server is acquired from the content server before the actual registration of the content If the download request source is notified and a download request for the content specified by the identification information is received from the download request source, the content relay device even before the content is registered in the content server A content relay method comprising: distributing the content buffered to a download request source. A content relay program for causing a computer to function as a content relay device that relays content uploaded from an upload request source to a content server,
The computer,
The identification information given to the content registered in the content server is acquired from the content server and notified to the download request source before the actual registration of the content, and specified by the identification information from the download request source. In order to function as a means for distributing the content buffered in the content relay device to the download request source even when the content download request is received before the content is registered in the content server Content relay program.

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