JP4750151B2 - Web content conversion editing system - Google Patents

Description

  The present invention relates to a web content conversion / editing system for a mobile station in a mobile communication network to acquire content from an application server of a content provider located on the web.

  In general, analog mobile communication systems of the 1980s (NTT, AMPS (Advanced Mobile Phone Service), TACS (Total Access Communications System), etc.) are called the first generation, and digital mobile communication systems of the 1990s ( PDC (Personal Digital Cellular telecommunication system), GSM (global system for mobile communication), IS-54, IS-95, etc.) are called the second generation (hereinafter referred to as “2G system”). The spread of these mobile communication systems is remarkable, and in Japan, the number of mobile telephones has reached 60 million. Such mobile phones are widely used as mobile phones, and sending and receiving Internet mail and acquiring web contents from a server on the Internet are being performed using the mobile phone as a terminal.

  Designed on the assumption that general web browsers installed in personal computers in offices and homes, and various contents published on websites are displayed on large display devices such as personal computers Is provided. On the other hand, since portable telephones place importance on portability, a message display area on a display and a memory area for storing acquired data are limited. Most mobile phones have a general web browsing function, but do not have all the rich functions of a web browser installed in a personal computer or the like. Therefore, there has been a problem that even when trying to acquire various contents published on the Internet from a mobile phone, the contents may not be completely acquired. In addition, when various contents are acquired, there is a problem that even if the contents cannot be displayed or are displayed, the display is abnormal.

  Therefore, an object of the present invention is to provide a web content conversion editing system that can absorb restrictions on a mobile station.

In order to achieve the above object, a web content conversion / editing system according to the present invention is a web content conversion / editing system that performs conversion / editing processing of a message transmitted / received between a mobile station and a content provider. A first control unit that processes a request message for requesting content from the server and transmits the request message to the content provider; and processes a response message acquired from the content provider in response to the request message and transmits the response message to the mobile station And the second control means, and when the file type of the content requested from the mobile station is a file type not subject to the conversion editing process, the first control means sends a file in the request message. transmitted to the content provider without editing the request header for designating the type of the A when the file type of the requested content from dynamic station is the file type of the target of the conversion editing process, the request header that range to be retrieved by specifying a part of the content is designated if it is a, the first control means is to be transmitted to the content provider by deleting a portion range in the request header is specified.

  In the web content conversion / editing system of the present invention, the second control means includes a request message from the mobile station in the content of the response message obtained from the content provider in response to the edited request message. A part of contents specified in the above may be sent to the mobile station.

According to the present invention as described above, only when a part of the content of the file type to be subjected to the conversion editing process is requested from the mobile station, all the contents are acquired from the content provider, and the specified one is obtained. Part of the content is sent to the mobile station. As a result, the mobile station can acquire a part of content without causing data inconsistency, and can prevent a reduction in communication efficiency .

FIG. 1 shows a schematic configuration of a network including a web content conversion editing system according to an embodiment of the present invention.
The network shown in FIG. 1 has a mobile communication network and another network such as the Internet. The mobile communication network is shown as a mobile station (MS) 10 that is a mobile phone, for example, and a wireless communication path 11. Yes. Other networks are shown as application servers 13a, 13b, 13c located on the network. A web content conversion / editing system 12 according to the present invention is arranged between a mobile communication network and another network, and is transmitted and received between the mobile station 10 and the application servers 13a to 13c which are content providers. The conversion editing is done.

  The mobile station 10 transmits an HTTP (HyperText Transport Protocol) request (Request) to the application servers 13a to 13c when content is acquired from any of the application servers 13a to 13c. Upon receiving this HTTP request, the application servers 13 a to 13 c send an HTTP response (Response) having the requested content as an entity body to the mobile station 10. In this case, the web content conversion editing system 12 according to the present invention, which is arranged between the mobile station 10 and the application servers 13a to 13c, executes various processes to be described later regarding web content conversion editing described below.

  One of the web content conversion editing processes executed by the web content conversion editing system 12 is a page size check process. This page size check process is a process of checking the byte length of the entity body that is the content in the HTTP response sent from any of the application servers 13a to 13c when the mobile station 10 acquires the content. . By performing this page size check process, it is possible to prevent the mobile station 10 from inadvertently acquiring large contents from the application servers 13a to 13c on the content providing side, and to effectively use the resources of the wireless communication path 11. Become. The upper limit byte length to be set in advance in the page size check process is the page size check definition for each content type (text, image, application, etc.) specified in the HTTP / 1.1 response header. It is set in a file.

  In this page size check definition file, the content type and its size length are shown with “,” in between. For example, “text / x-mml, 1024” means that the upper limit of the byte length of a text file whose content is an x-mml type is less than 1024 bytes. When the byte length is 1024 bytes or more, a check error is transmitted. “Text / *, 0” means that if the content is text-based content other than that defined in the page size check definition file, error transmission is performed as non-permitted content. Furthermore, “image / png.2048” means that the upper limit of the byte length of PNG (Portable Network Graphics) type image files is less than 2048 bytes, and the byte length of the type is 2048 bytes or more. If so, send a check error. The size lengths for other content types can be similarly interpreted in the corresponding definition file in the page size check definition file shown in FIG.

  In the page size check process in the content conversion editing process executed by the web content conversion editing system 12, the byte length information of the entity body is obtained when the content is acquired from any of the application servers 13a to 13c. Then, referring to the page size check definition file, the content type and size length set in this definition file are compared with the content type of the acquired content and the byte length of the entity body. Here, when the content types of the content acquired from any of the application servers 13a to 13c do not match, an error message indicating that the content types are different is transmitted to the mobile station 10 instead of the requested content. In addition, when it is determined that the byte length of the entity body is greater than or equal to the set size length, an error message indicating that the size of the prepared content is too large is replaced with the requested content, and the mobile station 10 Send to. In the HTTP / 1.1 response header, if the content is a program such as CGI (Common Gateway Interface) and the content size is not specified, the size of the entity body part is calculated and the byte length is calculated. The page size check process is performed based on the calculation result.

Here, a flowchart of the page size check process executed by the web content conversion / editing system 12 is shown in FIG.
When the page size check process starts, a content type (Content-Type) such as text / HTML is acquired from the response header in the HTTP response acquired in response to the HTTP request from any of the application servers 13a to 13c in step S10. . Next, in step S11, the content type acquired from the response header is compared with the content type set in the page size check definition file to determine whether the content type matches. If it is determined that they match, the process branches to step S13 to determine whether or not the set value of the content type size set in the page size check definition file is “0”. If it is determined that the setting value of the size of the content type is “0”, the content type is not supported, and the process branches to step S20 to display a page indicating “unsupported content” as a mobile station. 10 and the page is displayed on the display unit of the mobile station 10. In this case, the content is not acquired and is not sent to the mobile station 10.

  If it is determined in step S14 that the set value of the content type is not “0”, the process proceeds to step S14 to determine whether or not the content size (Content-Length) is set in the response header. Is done. If it is determined that the content size (Content-Length) is set in the response header, the process proceeds to step S15, and the content size (Content-Length) such as “1236” is acquired from the response header. The If it is determined in step S14 that the content size (Content-Length) is not set in the response header, the process branches to step S16 to calculate and substitute the size of the entity body part of the HTTP response. However, in the case of chunked transfer coding in which content is divided and sent, the divided content is combined, and then the size of the entity body part is calculated and substituted.

  When the processing in step S15 or step S16 is completed, it is determined whether or not the content size acquired or calculated in step S17 is equal to or larger than the size of the content type set in the page size check definition file. The Here, when it is determined that the content type is smaller than the size of the content type set in the page size check definition file, the size of the content in the HTTP response is a size that matches the specifications of the mobile station 10. In step S18, the acquired HTTP response is transmitted to the mobile station 10 as it is without being edited. If it is determined that the content type is larger than the size set in the page size check definition file, the process proceeds to step S19, where the content size in the HTTP response is too large and deviates from the specification of the mobile station 10. Therefore, a page stating that “the content size is too large” is transmitted to the mobile station 10 instead of the content, and the page is displayed on the display unit of the mobile station 10. If it is determined in step S11 that the content type does not match the content type set in the page size check definition file, the condition for limiting the content type is not set. In step S12, the acquired HTTP response is transmitted to the mobile station 10 as it is without being edited.

  In the above-described page size check process, when chunked transfer coding is specified in which content is divided and sent, the content is divided and acquired from any of the application servers 13a to 13c, and the web content conversion editing is performed. When the system 12 sends the message to the mobile station 10, the page size check process is performed for the entire size obtained by combining the divided contents. Note that the setting contents of the page size check definition file that defines the content type and size can be changed.

  Next, one of the web content conversion editing processes executed by the web content conversion editing system 12 is a range request handling process. A range request is a request for specifying a range in content and acquiring only that range. By the way, when the content is subjected to compression processing or the like, the form of the content compression processing may be different with the web content conversion / editing system 12 interposed therebetween. On the content provider side, physical entities such as content size may differ. Then, when the mobile station 10 requests partial content by a range request, there is a possibility that data inconsistency may occur between the requested partial content and the acquired partial content.

  Therefore, in order to prevent this, the web content conversion editing system 12 designates this range when there is a header for designating a range in the header in the HTTP request received from the mobile station 10 (range request). The header of the range request is deleted and sent to the application servers 13a to 13c, and all contents are received as responses from the application servers 13a to 13c. Then, the web content conversion / editing system 12 sends the partial content in the range specified in the header of the range request among all the received content to the mobile station 10. As a result, it is possible to prevent the possibility of data inconsistency between the requested partial content and the acquired partial content. However, if all the range request requests from the mobile station 10 are rejected, all the contents are always transmitted from the application servers 13a to 13c, and the communication efficiency is lowered. Therefore, a file type that does not normally cause a data inconsistency between the requested partial content and the acquired partial content is defined as a file outside the range request target process. An example of this Range request target out-of-process definition file is shown in FIG. When the extension of the file type of the content requested by the HTTP request matches the defined extension shown in FIG. 5, the range request is transmitted as it is to the application servers 13a to 13c. Thereby, it is possible to prevent a decrease in communication efficiency.

Here, a flowchart of the Range request handling process is shown in FIG.
When the range request handling process is started, an extension indicating the file type of the content is acquired from the request header of the HTTP request in step S30. Next, in step S31, it is determined whether or not the extension acquired from the request header matches the extension set in the Range request target non-process definition file. An example of a Range request target non-processing definition file is shown in FIG. 5, and an extension indicating a file type that is not a range request compatible processing target is set. If it is determined in step S31 that the extension acquired from the request header matches the extension set in the Range request non-process definition file, the file type of the requested content corresponds to the range request. The file type is not subject to processing. Therefore, the process branches to step S35 and is transmitted from the web content conversion editing system 12 as it is to the application servers 13a to 13c without editing the request header. In this case, even if the request is a range request, the HTTP request is transmitted to the application servers 13a to 13c as they are.

  If it is determined in step S31 that the extension acquired from the request header does not match the extension set in the definition file outside the Range request target process, the file type of the requested content is File type for which range request handling processing is performed. Therefore, the process proceeds to step S32, and it is determined whether or not the request is a range request in which the range is specified in the request header of the HTTP request. If it is determined that the HTTP request is a range request, the process branches to step S34, the range portion is deleted from the request header, and the edited HTTP request is transmitted to the application servers 13a to 13c.

  As a result, the HTTP responses of all the contents are transmitted from the application servers 13a to 13c which are the content providing sources, and the web content conversion editing system 12 receives all the contents as the HTTP response. Then, the web content conversion / editing system 12 sends the partial content in the range specified in the range request among all the received content to the mobile station 10. If it is determined in step S32 that the range is not specified in the request header and it is determined that the request is not a range request, the process proceeds to step S33, and the request header is not edited, and the request is directed to the application servers 13a to 13c. To send an HTTP request.

  In this way, when a file type that does not delete the range part from the request header of the range request is set in the definition file outside the Range request target process and a range request of the corresponding file type is received, the range request header The range portion is sent to the application servers 13a to 13c without being deleted. Thereby, it is possible to prevent a decrease in communication efficiency. Note that the file types that are not subject to the Range request handling process set in the definition file outside the Range request target process are the contents on the mobile station 10 side and the content providing side of the application servers 13a to 13c as shown in FIG. Jpeg and png file types are less likely to have different physical entities such as the size of the file.

Next, one of the web content conversion editing processes executed by the web content conversion editing system 12 is an HTTP entity body compression process.
The compression processing of the HTTP entity body is performed in order to reduce the amount of data transferred between the mobile station 10 side and the application servers 13a to 13c that provide content, and to effectively use the resources of the wireless communication path 11. In the HTTP response received from the application servers 13a to 13c, the web content conversion editing system 12 compresses the entity body (content) in response to a request from the mobile station 10 and transmits the compressed entity body (content) to the mobile station 10 side. If the compressed entity body is sent from the application servers 13a to 13c, the compression type may not be accepted by the mobile station 10. Therefore, the entity body compressed by the web content conversion editing system 12 is decompressed. Therefore, the processing efficiency is reduced. In order to prevent this, the web content conversion editing system 12 receives an uncompressed entity body as an HTTP response from the application servers 13a to 13c. Then, in the web content conversion / editing system 12, the content is converted and edited, and then the compression processing is performed.

  By the way, the mobile station 10 designates a compression type to be accepted by an Accept-Encoding header in the HTTP request. In this accept encoding header, when the value of the designated compression type is a NULL value (or “identify”), content compression is not allowed in the mobile station 10. In addition, when one of the compression types is specified, and when the accept encoding header is not specified, content compression is permitted in the mobile station 10, and only in this case web content In the conversion / editing system 12, the compression-type entity body that is accepted by the mobile station 10 is compressed.

  In this case, in order to notify the content providing side that the content is not compressed and transmitted, the web content conversion editing system 12 accepts an HTTP request from the mobile station 10 with a NULL value (or “identify”) set. An encoding header is added and transmitted to the application servers 13a to 13c on the content providing side. As a result, HTTP responses from the application servers 13a to 13c are not compressed. If the specified compression type value is a NULL value (or “identify”) in the accept encoding header in the HTTP request from the mobile station 10, content compression is not permitted as described above. Therefore, the web content conversion / editing system 12 does not perform content compression. As the compression type performed by the web content conversion / editing system 12, the DEFLATE format or the GZIP format is generally used.

Here, FIG. 6 shows a flowchart of HTTP entity body compression processing 1 executed by the web content conversion / editing system 12. In this HTTP entity body compression process 1, the header of the HTTP request from the mobile station 10 is edited.
When the HTTP entity body compression process 1 starts, Accept-Encoding that specifies the compression type in the request header of the HTTP request from the mobile station 10 is acquired in step S40. Next, it is determined whether or not a compression type is designated in the acquired Accept-Encoding. Here, when it is determined that the compression type is not specified in Accept-Encoding, this is a case where content compression is permitted in the mobile station 10, and the process branches to step S44. In step S44, a NULL value (or “identify”) is set in Accept-Encoding in the request header, and is transmitted to the application servers 13a to 13c on the content providing side. As a result, HTTP responses from the application servers 13a to 13c are not compressed.

  If it is determined in step S41 that the compression type is specified by Accept-Encoding, the process proceeds to step S42, and whether or not a NULL value (or “identify”) is set in Accept-Encoding in the request header. Is judged. Here, when it is determined that a NULL value (or “identify”) is set in Accept-Encoding, this is a case where content compression is not permitted in the mobile station 10, and the process branches to step S45. In step S45, it is transmitted to the application servers 13a to 13c on the content providing side without editing the Accept-Encoding of the request header. As a result, HTTP responses from the application servers 13a to 13c are not compressed.

  If it is determined in step S42 that a compression type that is not a NULL value (or “identify”) is set in Accept-Encoding, content compression of the compression type set in the mobile station 10 is allowed. The process proceeds to step S43. In step S43, a NULL value (or “identify”) is set in Accept-Encoding in the request header, and is transmitted to the application servers 13a to 13c on the content providing side. As a result, HTTP responses from the application servers 13a to 13c are not compressed. In this way, HTTP responses from the application servers 13a to 13c on the content providing side are not compressed and are received by the web content conversion / editing system 12. Then, the web content conversion editing system 12 transmits an HTTP response obtained by compressing the entity body with a compression type corresponding to the designation of Accept-Encoding of the request header in the HTTP request from the mobile station 10 to the mobile station.

  By the way, whether the content type and the byte length of the entity body exceed the content type set in the page size check definition file and the set size length may be compressed. In this case, the page size check definition file that defines the content type to be compressed and the size length can be changed. Furthermore, the web content conversion editing system 12 adds a content encoding (Content-Encoding) header to the HTTP response in which the entity body is compressed, thereby specifying the compression type and transmitting it to the mobile station 10. ing. The value set in this content encoding is, for example, “DEFLATE” or “GZIP”. Since image files are usually compressed, they are excluded from the content types to be compressed.

Here, a flowchart of HTTP entity body compression processing 2 executed by the web content conversion / editing system 12 is shown in FIG. In this HTTP entity body compression process 2, the entity body of the acquired HTTP response is compressed.
When the HTTP entity body compression process 2 starts, the content type (Content-Type) is acquired from the response header of the HTTP response from the application servers 13a to 13c on the content providing side in step S50. Next, in step S51, the content type acquired from the response header is compared with the content type set in the page size check definition file to determine whether the content type matches. If it is determined that they match, the process branches to step S53, and the content size (Content-Length) such as “1236” is acquired from the response header.

  Next, it is determined whether or not the content type is larger than the size set in the page size check definition file. Here, when it is determined that the content type is smaller than the size of the content type set in the page size check definition file, the size of the content in the HTTP response is a size that matches the specifications of the mobile station 10. In step S55, the entity body of the acquired HTTP response is transmitted to the mobile station 10 as it is without being compressed. If it is determined that the content type is equal to or larger than the size of the content type set in the page size check definition file, the content size in the HTTP response is too larger than the specification of the mobile station 10, and thus the process proceeds to step S56 and the HTTP response The entity body is compressed. In this case, the entity body of the HTTP response is compressed in, for example, the DEFLATE format or the GZIP format, and the value of the compression type is set as content encoding (Content-Encoding) and transmitted to the mobile station 10. Accordingly, even when the content size in the HTTP response exceeds the specification of the mobile station 10, the mobile station 10 can acquire the content by clearing the content size condition by compression.

If the content request is a range request and content compression is specified, the web content conversion / editing system 12 edits the request header of the HTTP request for requesting all uncompressed content at the content provider. It transmits to a certain application server 13a-13c. Thereby, the HTTP response from the application servers 13a to 13c becomes all uncompressed contents. Therefore, the web content conversion editing system 12 performs compression processing of the compression type specified for the content in the specified range, and transmits it to the mobile station 10.
As described above, according to the present invention, when a part of content is requested from a mobile station, all contents are acquired from the content provider, and the specified part of the content is sent to the mobile station. Yes. Thereby, the mobile station can acquire a part of content without causing data inconsistency.

In the present invention, when the acquired content type and size are not set, information indicating that may be sent to the mobile station instead of the content. In this way, content that cannot be acquired due to restrictions of the mobile station is not acquired and the user can be notified of this. In addition, since content that cannot be acquired is not sent to the mobile station, it is possible to prevent wasteful use of limited radio resources.
Furthermore, when a compressed content is requested from the mobile station, uncompressed content may be acquired from the content provider, and compressed into a designated compression type and sent. In this way, it is possible to eliminate the need to perform further compression processing after decompressing the content acquired from the content provider, and to prevent a reduction in processing efficiency. Further, restrictions on the specifications of the mobile station can be absorbed as much as possible, and usability in web communication at the mobile station can be improved.

It is a figure which shows schematic structure of a network provided with the web content conversion edit system of embodiment of this invention. It is a flowchart of the page size check process performed with the web content conversion edit system of embodiment of this invention. It is a page size check definition file set in the web content conversion editing system according to the embodiment of the present invention. It is a flowchart of the range request corresponding | compatible process performed with the web content conversion edit system of embodiment of this invention. It is a Range request corresponding process exclusion target definition file set in the web content conversion editing system of the embodiment of the present invention. It is a flowchart of the HTTP entity body compression process 1 performed with the web content conversion edit system of embodiment of this invention. It is a flowchart of the HTTP entity body compression process 2 performed with the web content conversion edit system of embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mobile station, 11 Wireless communication channel, 12 Web content conversion edit system, 13a Application server

Claims (2)

A web content conversion editing system that performs conversion editing processing of messages transmitted and received between a mobile station and a content provider,
First control means for processing a request message for requesting content from the mobile station and transmitting the request message to the content provider;
A second control means for processing a response message acquired from the content provider in response to the request message and transmitting the response message to the mobile station;
When the file type of the content requested from the mobile station is a file type that is not subject to the conversion and editing process, the first control unit edits a request header for specifying the file type in the request message The content file type requested from the mobile station is the file type that is the target of the conversion and editing process, and a part of the content is specified and acquired. When the request header is designated with a range for the first header , the first control unit deletes the portion of the request header with the designated range and transmits the request header to the content provider. A web content conversion editing system characterized by the above.   The second control means includes a part of the content specified in the request message from the mobile station in the response message acquired from the content provider in response to the edited request message. The web content conversion editing system according to claim 1, wherein the web content conversion editing system is sent to:

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