CN105978936A - CDN server and data caching method thereof - Google Patents
CDN server and data caching method thereof Download PDFInfo
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- CN105978936A CN105978936A CN201610262876.2A CN201610262876A CN105978936A CN 105978936 A CN105978936 A CN 105978936A CN 201610262876 A CN201610262876 A CN 201610262876A CN 105978936 A CN105978936 A CN 105978936A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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Abstract
Embodiments of the invention provide a CDN server and a data caching method thereof. The method comprises the following steps: a CDN server receives a first hypertext transfer protocol HTTP request message, wherein the first HTTP request message is used to access the data in a target range in a first file; dividing the target range into at least two sub ranges, and determining target sub ranges in which the data is not cached in the CDN server among the at least two sub ranges; for each target sub range, generating an HTTP request message used to request data in the target sub range; sending the generated HTTP request messages to a CDN source station; and receiving an HTTP response message including the data in the target sub ranges sent by the CDN source station, and caching the data in the target sub ranges. The CDN server can cache data in fragments.
Description
Technical field
The present embodiments relate to network communication field, particularly relate to a kind of CDN server and caching number thereof
According to method.
Background technology
Content distributing network (Content Delivery Network, CDN) relies on the edge being deployed in various places
Server, by functional modules such as the load balancing of central platform, content distribution, scheduling, makes user nearby
Obtain required content, reduce network congestion, improve user's access response speed and hit rate.The pass of CDN
Key technology mainly has content storage and distribution technology.
A node in CDN is a CDN server, and these CDN server are distributed to
User accesses in area or the network of Relatively centralized.When user accesses website, utilization overall situation load technology will
Accessing of user is pointed in closest CDN server working properly, is cached with in CDN server
During the data that user accesses, this CDN server can be asked directly in response to user, in CDN server not
When being cached with the data that user accesses, this CDN server, just to CDN source station request data, reduces
The load of CDN source station, described CDN source station refers to issue the original site of content.
In prior art, client can send HTML (Hypertext Markup Language) (HyperText Transfer
Protocol, HTTP) request message is to CDN server, for request data, if this CDN server
Be cached with the data of this client demand, then these data of caching are sent to this client by this CDN server
End, if the uncached data having this client demand of this CDN server, then this CDN server can be by
This HTTP request message sends to CDN source station, obtains the number of this client demand from this CDN source station
According to row cache of going forward side by side.
But, owing to the HTTP request message of client transmission to CDN server may only demand file
In part data, rather than the partial data of file, in this case, if multiple HTTP request message
But request is different in identical file the data that mutual is overlapping, and these overlapping part data will be by CDN
Server repeats caching, and such as, first HTTP request message requires to obtain 0 to 100MB in file
(Mbytes) data, second HTTP request message requires to obtain 4 to 100MB in identical file
Data, now, 4 to the 100MB data in this document can be repeated caching, waste by CDN server
The cache resources of CDN server.
Summary of the invention
The embodiment of the present invention provides a kind of CDN server and data cached method thereof, to solve existing skill
The cache resources of CDN server is wasted bigger defect by art, it is achieved data are carried out fragment cache memory.
The embodiment of the present invention provides a kind of method that CDN server is data cached, including:
CDN server receives the first HTTP request message, a described HTTP
Request message is for the data accessed in the first file in target zone；
Described target zone is divided at least two subrange by described CDN server, and described at least
Two subranges determine the target subrange that data do not cache in described CDN server；
Described CDN server generates one for each described target subrange and is used for asking described target
In the range of the HTTP request message of data；
The described HTTP request message generated is sent to CDN source station by described CDN server；
Described CDN server receives the data including in described target subrange that described CDN source station sends
Http response message, and the data in described target subrange are cached.
The embodiment of the present invention provides a kind of CDN server, including:
First receives unit, for receiving the first HTTP request message, and described first
HTTP request message is for the data accessed in the first file in target zone；
Division unit, for described target zone being divided at least two subrange, and described at least
Two subranges determine the target subrange that data do not cache in described CDN server；
Signal generating unit, is used for asking described target for generating one for each described target subrange
In the range of the HTTP request message of data；
Transmitting element, sends to CDN source station for the described HTTP request message that will generate；
Second receive unit, for receive described CDN source station send include described target subrange in
The http response message of data；
Buffer unit, for caching the data in described target subrange.
A kind of CDN server of embodiment of the present invention offer and data cached method thereof, described CDN takes
The target zone of request, after receiving described first HTTP request message, is divided at least two by business device
Subrange, and determine, in described at least two subrange, the mesh that data do not cache in described CDN server
Mark subrange；Described CDN server generates one for each described target subrange and is used for asking described
The HTTP request message of the data in target subrange；The described HTTP that described CDN server will generate
Request message sends to CDN source station；Described CDN server receives including of described CDN source station transmission
The http response message of the data in described target subrange, and the data in described target subrange are entered
Row cache.It is to say, the target data that HTTP request message is asked is divided into less by CDN server
The data fragmentation of granularity stores, and so, described CDN server receives in multiple request identical file
But during the different HTTP request message of the data that mutual is overlapping, described CDN server is for overlapping
Part data carry out the data of fragment cache memory, it is not necessary to obtain from described CDN source station again,
Avoid and these part data are repeated caching, and, data granularity is the least, can in two data fragmentations
The repetition data that can exist are the fewest, reduce the waste to CDN processor cache resource.
Accompanying drawing explanation
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, institute in embodiment being described below
The accompanying drawing used is needed to briefly introduce, it should be apparent that, the accompanying drawing in describing below is only the present invention's
Some embodiments, from the point of view of those of ordinary skill in the art, in the premise not paying creative work
Under, it is also possible to other accompanying drawing is obtained according to these accompanying drawings.
The flow process signal of the method that a kind of CDN server that Fig. 1 provides for the embodiment of the present invention is data cached
Figure；
The flow process of the method that another kind of CDN server that Fig. 2 provides for the embodiment of the present invention is data cached is shown
It is intended to；
The structural representation of a kind of CDN server that Fig. 3 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the present invention, is not
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
The every other embodiment obtained under property work premise, broadly falls into the scope of protection of the invention.
In order to make those skilled in the art be easier to understand the technical scheme that the embodiment of the present invention provides, below
First the correlation technique that the present embodiments relate to simply is introduced.
HTTP is the rule that a set of computer is communicated by network, uses HTTP client by sending out
Sending the HTTP request message can be to http server solicited message and service, described HTTP client can
Thinking Web browser, described http server can be Web server.
HTTP request message is made up of three parts: request row (Request Line), message header (Message
Headers) and message body (Entity Body), wherein, divided by null between message header and message body
Every.
Specifically, request row is made up of three labellings: requesting method, Uniform Resource Identifier (Uniform
Resource Identifier, URI) and HTTP version, such as: GET/news.asp HTTP/1.1.With
In upper code, " GET " represents requesting method, and "/news.asp " represents URI, and " HTTP/1.1 " represents agreement version
This.What deserves to be explained is, URI intactly specifies the Internet resources in http server to be accessed,
As long as generally providing the relative directory of the root relative to server.
Message header allows HTTP client to http server transmission about request or about client
Additional information.Message header includes the fields such as Host header field, Referer header field, and wherein, Host header field represents
The main frame of request resource and port numbers, Referer header field allows client to specify the resource ground, source of request URI
Location.What deserves to be explained is, Range is a header field newly-increased in HTTP/1.1, and range header field allows
One or more subrange of client request entity.So, if HTTP request message includes unified
Resource identifier and range information, then the target zone of the data asked is should unified resource mark
Know the scope of this range information instruction in the file of symbol, if this HTTP request message includes unified resource
Identifier does not include range information, then the target zone of the data asked is should uniform resource identifier
The scope of the partial data in the file of symbol.
Message body for carrying and asking the data that are associated, the parameter etc. that such as some requests need.By disappearing
Content-length Content-Type and content type Content-Length in breath head indicate.
In prior art, CDN server is for the data that still mutual is overlapping different in request identical file
The process of multiple HTTP request message, cause CDN server to repeat these part data that caching is overlapping,
Waste cache resources.
The embodiment of the present invention provides a kind of method that CDN server is data cached, as it is shown in figure 1, the party
Method includes:
Step 100, CDN server receive the first HTTP request message, and described
One HTTP request message is for the data accessed in the first file in target zone.
Wherein, described first HTTP request message includes the Uniform Resource Identifier of described first file.Institute
State the position that the first HTTP request message can also include indicating data to be read in described first file
Range information, in this case, described target zone this range information i.e. instruction scope, institute
Stating the first HTTP request message and can not also include range information, now, described target zone is institute
State the scope of partial data in the first file.
Described target zone is divided at least two subrange by step 101, described CDN server, and
The target subrange that data do not cache is determined in described CDN server in described at least two subrange.
Alternatively, described CDN server can be described target zone to be divided according to default burst rule
For at least two subrange.In the specific implementation, can according to the actual requirements described burst rule be set
Fixed, such as, preset the size of each burst, or, preset the quantity of each burst.
What deserves to be explained is, described CDN server before receiving described first HTTP request message,
May there is the partial data of described first file by fragment cache memory, it is also possible to fragment cache memory has had described
Part data in first file, therefore, described target zone is divided at least by described CDN server
After two subranges, the caching of described CDN server there may be the data in some subrange.Right
Subrange in data have been buffered in described CDN server, described CDN server is right without generating
The HTTP request message answered, it is to avoid again obtain from CDN source station, and then avoid and again cache,
Reduce cache resources waste.
Step 102, described CDN server generate one for each described target subrange and are used for asking
The HTTP request message of the data in described target subrange.
Specifically, the uniform resource identifier in each HTTP request message that described CDN server generates
Symbol is first file Uniform Resource Identifier in CDN source station, with described first HTTP request message
In Uniform Resource Identifier identical, and, described CDN server generate each HTTP request disappear
Breath also includes the range information for indicating described subrange.
The described HTTP request message generated is sent to CDN source by step 103, described CDN server
Stand.
What step 104, the described CDN server described CDN source station of reception sent includes the sub-model of described target
Enclose the http response message of interior data, and the data in described target subrange are cached.
What deserves to be explained is, existing CDN source station includes the HTTP request of range information receiving
During message, the http response message that this CDN source station returns is except carrying the model of this range information instruction
Enclosing interior data, the answer code also carried is 206.
In embodiments of the present invention, described CDN server can include described http response receiving
After message, the answer code 206 included according to described http response message is to the number in described target subrange
According to caching.
Using said method, described CDN server receives different still mutuals in multiple request identical file
During the HTTP request message of overlapping data, described CDN server is in overlapping part data
The data of fragment cache memory are carried out, it is not necessary to obtain from described CDN source station again, it is to avoid to this portion
Divided data repeat caching, and, data granularity is the least, repeat number that may be present in two data fragmentations
According to the fewest, reduce the waste to CDN processor cache resource.
In order to enable those skilled in the art to be more clearly understood that the technical scheme that the embodiment of the present invention provides,
Below by specific embodiment, a kind of CDN server providing the embodiment of the present invention is data cached
Method is described in detail, as in figure 2 it is shown, the method includes:
The first HTTP request message that step 200, CDN server reception client sends, described first
HTTP request message target zone in request the first file is the data of 0 to 99MB.
Illustratively, described first HTTP request message includes the Uniform Resource Identifier of this first file, also
Range information including as follows: Range:bytes=0-99MB.
It is equal that the target zone of described 0 to 99MB is divided into size by step 201, described CDN server
10 subranges for 10MB.
It is to say, target zone 0 to 100MB is divided into 0 to 9MB, 10 to 19MB, 20 to
29MB, 30 to 39MB, 40 to 49MB, 50 to 59MB, 60 to 69MB, 70 to 79MB,
80 to 89MB, 90 to 99MB totally 10 subranges.
Step 202, described CDN server determine uncached described 10 the sub-models of described CDN server
Data in enclosing.
Step 203, described CDN server generate one for each subrange in described 10 subranges
The HTTP request message of individual correspondence.
Illustratively, for subrange 0 to 9MB, the range information in the HTTP request message of generation is:
Range:bytes=0-9MB；For subrange 10 to 19MB, the range in the HTTP request message of generation
Information is: Range:bytes=10-19MB；For subrange 20 to 29MB, the HTTP request of generation
Range information in message is: Range:bytes=20-29MB；For subrange 30 to 39MB, raw
Range information in the HTTP request message become is: Range:bytes=30-39MB；For subrange
40 to 49MB, the range information in the HTTP request message of generation is: Range:bytes=40-49MB；
For subrange 50 to 59MB, the range information in the HTTP request message of generation is:
Range:bytes=50-59MB；For subrange 60 to 69MB, in the HTTP request message of generation
Range information is: Range:bytes=60-69MB；For subrange 70 to 79MB, the HTTP of generation
Range information in request message is: Range:bytes=70-79MB；For subrange 80 to 89MB,
Range information in the HTTP request message generated is: Range:bytes=80-89MB；For subrange
90 to 99MB, the range information in the HTTP request message of generation is: Range:bytes=90-99MB.
Further, the HTTP request message that above-mentioned all CDN server generate all includes described first file
Uniform Resource Identifier.
The above-mentioned dividing mode to target zone is only a kind of possible implementation of the embodiment of the present invention,
When being embodied as, user can pre-set dividing mode according to the actual requirements, including for each subrange
The setting of size, or, the setting of antithetical phrase number of ranges, this is not limited by the present invention.
The described HTTP request message generated is sent to CDN source by step 204, described CDN server
Stand.
What deserves to be explained is, multiple HTTP request that the embodiment of the present invention generates for CDN server disappear
The transmission order of breath does not limits, and can also asynchronous transmission with synchronized transmission.
Step 205, described CDN source station obtain described 10 according to the described HTTP request message received
Data in individual subrange.
Each http response of data that step 206, described CDN source station will include in each subrange
Message is respectively sent to described CDN server.
Specifically, 10 HTTP request message sent for above-mentioned CDN server, described CDN
Source station will send 10 corresponding http response message to described CDN server, each http response
Message includes the data in the subrange of correspondence.
Step 207, described CDN server receive the described http response of described CDN source station transmission and disappear
Breath, and cache the data in the range of described 10 sons respectively.
Illustratively, each http response message except include correspondence subrange in data, also include ring
After answering code 206, described CDN server often to receive a http response message, according to described HTTP
Answer code 206 in response message caches the data in the range of a son, it is achieved that the mesh to 0 to 99MB
The burst storage of the data in mark scope.
The data that step 208, described CDN server merge in the range of described 10 sons obtain target zone
Data in 0 to 100MB, and described data are sent to described client.
Step 209, described CDN server receive the second HTTP request message that described client sends,
Described second HTTP request message target zone in request the first file is the data of 0 to 96MB.
The scope of described 0 to 89MB is divided into size and is 10MB by step 210, described CDN server
9 subranges, remaining 90 to 96MB is the 10th subrange.
Specifically, described size be scope 0 that 9 subranges of 10MB are specially in the first file to
9MB, 10 to 19MB, 20 to 29MB, 30 to 39MB, 40 to 49MB, 50 to 59MB,
60 to 69MB, 70 to 79MB, 80 to 89MB.
Step 211, described CDN server determine that being cached with described size in described CDN server is
Data in data in 9 subranges of 10MB, and uncached described 10th subrange.
Step 212, described CDN server generate for asking data in described 10th subrange
HTTP request message.
From above-mentioned steps 200 to step 207, described CDN server has been cached with the first file
0 to 9MB, 10 to 19MB, 20 to 29MB, 30 to 39MB, 40 to 49MB, 50 to 59MB,
Data in 60 to 69MB, 70 to 79MB, 80 to 89MB totally 9 subranges, the most individually cache
Data in the range of 90 to 96MB.Therefore, described CDN server is without for above-mentioned 9 subranges
Generate corresponding HTTP request message, it is to avoid again obtain from CDN source station, and then avoid again
Caching, reduces cache resources waste.
The described HTTP request message generated is sent to described CDN by step 213, described CDN server
Source station.
What step 214, the described CDN server described CDN source station of reception sent includes described 10th
The http response message of the data in subrange, and cache the data in described 10th subrange.
What deserves to be explained is, in step 207, in the range of described CDN server is cached with 90 to 99MB
Data, in step 214, described CDN server caching 90 to 96MB in the range of data, twice
In caching, the data in the range of 90 to 96MB are repeated caching, but, owing to data fragmentation is less, weight
Multiple data volume is less, the most respectively caching 0 to 99MB in the range of data and 0 to
Data in the range of 96MB, the embodiment of the present invention reduces the waste of cache resources.
Step 215, described CDN server merge data in described 9 subranges with described 10th
Data in subrange, obtain the data in described target zone 0 to 96MB, and described data are sent
To described client.
Using said method, the target data that HTTP request message is asked is divided into by described CDN server
The data fragmentation of smaller particle size stores, and reduces the waste of CDN cache resources, and, more granule
Degree data buffer storage be conducive to improving buffer efficiency, and, each data fragmentation of the data of identical file it
Between asynchronous buffer, it is to avoid after only the partial data at described file all caches, client just can carry out
The defect accessed, improves the response speed to client.
What deserves to be explained is, for said method embodiment, in order to be briefly described, therefore it is all expressed as one
The combination of actions of series, but those skilled in the art should know, and the present invention is not by described action
The restriction of order.Secondly, those skilled in the art also should know, embodiment described in this description is equal
Belong to preferred embodiment, necessary to the involved action not necessarily present invention.
The embodiment of the present invention also provides for a kind of CDN server 30, and being used for implementing said method embodiment provides
A kind of method data cached for CDN, as it is shown on figure 3, described CDN server 30 includes:
First receives unit 31, for receiving the first HTTP request message, and described the
One HTTP request message is for the data accessed in the first file in target zone；
Division unit 32, for described target zone being divided at least two subrange, and described at least
Two subranges determine the target subrange that data do not cache in described CDN server；
Signal generating unit 33, is used for asking described target for generating one for each described target subrange
In the range of the HTTP request message of data；
Transmitting element 34, sends to CDN source station for the described HTTP request message that will generate；
Second receive unit 35, for receive described CDN source station send include described target subrange in
The http response message of data；
Buffer unit 36, for caching the data in described target subrange.
Wherein, described first HTTP request message can include range information, in this case, institute
State the data to be read scope in described first file that target zone is the instruction of described range information.
Described first HTTP request message can not also include range information, in this case, described
Target zone is the scope of the partial data of described first file.
Alternatively, described division unit 32 specifically for: according to default burst rule by described target zone
It is divided at least two subrange.In the specific implementation, can according to the actual requirements described burst rule be entered
Row sets, and such as, presets the size of each burst, or, preset the quantity of each burst.
Alternatively, the described HTTP request message that described signal generating unit 33 generates includes for indicating described
The range information of target subrange.With reference to above-mentioned retouching the step 203 in embodiment of the method shown in Fig. 2
Stating, here is omitted.
Alternatively, described http response message also includes answer code 206；Described buffer unit 36 is specifically used
In: according to described answer code 206, the data in described target subrange are cached.
What deserves to be explained is, existing CDN server is after receiving http response message, if this HTTP
The answer code carried in response message is 206, and the data do not carried this http response message are delayed
Deposit, and the CDN server that the embodiment of the present invention provides can the answer code in http response message be
When 206, also data are cached.
Use above-mentioned CDN server, the number of targets that HTTP request message is asked by described CDN server
Storing according to the data fragmentation being divided into smaller particle size, so, described CDN server receives multiple requests
In identical file during the different but HTTP request message of the data that mutual is overlapping, described CDN server
For overlapping part data have carried out the data of fragment cache memory, it is not necessary to again from described CDN source station
Obtain, it is to avoid these part data are repeated caching, and, data granularity is the least, two data
In burst, repetition data that may be present are the fewest, reduce the waste to CDN processor cache resource.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, only with above-mentioned
The division of each functional module is illustrated, and in actual application, can above-mentioned functions be divided as desired
Join and completed by different functional modules, the internal structure of device will be divided into different functional modules, with complete
Become all or part of function described above.The specific works process of each unit of foregoing description, Ke Yican
State the corresponding process in embodiment of the method before examination, do not repeat them here.
Device embodiment described above is only schematically, wherein said illustrates as separating component
Unit can be or may not be physically separate, and the parts shown as unit can be or also
Can not be physical location, i.e. may be located at a place, or can also be distributed on multiple NE.
Some or all of module therein can be selected according to the actual needs to realize the mesh of the present embodiment scheme
's.Those of ordinary skill in the art, in the case of not paying performing creative labour, are i.e. appreciated that and implement.
Through the above description of the embodiments, those skilled in the art is it can be understood that arrive each enforcement
Mode can add the mode of required general hardware platform by software and realize, naturally it is also possible to pass through hardware.
Based on such understanding, the part that prior art is contributed by technique scheme the most in other words is permissible
Embodying with the form of software product, this computer software product can be stored in computer-readable storage medium
In matter, such as ROM/RAM, magnetic disc, CD etc., including some instructions with so that a computer equipment
(can be personal computer, server, or the network equipment etc.) performs each embodiment or embodiment
The method described in some part.
Last it is noted that above example is only in order to illustrate technical scheme, rather than it is limited
System；Although the present invention being described in detail with reference to previous embodiment, those of ordinary skill in the art
It is understood that the technical scheme described in foregoing embodiments still can be modified by it, or to it
Middle part technical characteristic carries out equivalent；And these amendments or replacement, do not make appropriate technical solution
Essence departs from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (10)
1. the method that a CDN server is data cached, it is characterised in that including:
CDN server receives the first HTTP request message, a described HTTP
Request message is for the data accessed in the first file in target zone；
Described target zone is divided at least two subrange by described CDN server, and described at least
Two subranges determine the target subrange that data do not cache in described CDN server；
Described CDN server generates one for each described target subrange and is used for asking described target
In the range of the HTTP request message of data；
The described HTTP request message generated is sent to CDN source station by described CDN server；
Described CDN server receives the data including in described target subrange that described CDN source station sends
Http response message, and the data in described target subrange are cached.
Method the most according to claim 1, it is characterised in that described first HTTP request message
Including read range range information, described target zone is the data to be read of described range information instruction
Scope in described first file.
Method the most according to claim 1, it is characterised in that described first HTTP request message
Not including read range range information, described target zone is the scope of the partial data of described first file.
4. according to the method described in any one of claims 1 to 3, it is characterised in that described CDN service
Described target zone is divided at least two subrange by device, including:
Described target zone is divided into the sub-model of at least two according to default burst rule by described CDN server
Enclose.
5. according to the method described in any one of claims 1 to 3, it is characterised in that described CDN service
The described HTTP request message that device generates includes the range information for indicating described target subrange.
6. a CDN server, it is characterised in that including:
First receives unit, for receiving the first HTTP request message, and described first
HTTP request message is for the data accessed in the first file in target zone；
Division unit, for being divided at least two subrange, and described at least two by described target zone
Individual subrange determines the target subrange that data do not cache in described CDN server；
Signal generating unit, is used for asking the sub-model of described target for generating one for each described target subrange
Enclose the HTTP request message of interior data；
Transmitting element, sends to CDN source station for the described HTTP request message that will generate；
Second receive unit, for receive described CDN source station send include described target subrange in
The http response message of data；
Buffer unit, for caching the data in described target subrange.
CDN server the most according to claim 6, it is characterised in that a described HTTP please
Asking message to include read range range information, described target zone is continuing of described range information instruction
Fetch data the scope in described first file.
CDN server the most according to claim 6, it is characterised in that a described HTTP please
Asking message not include read range range information, described target zone is the partial data of described first file
Scope.
9. according to the arbitrary described CDN server of claim 6 to 8, it is characterised in that described division
Unit specifically for: according to default burst rule described target zone is divided at least two subrange.
10. according to the arbitrary described CDN server of claim 6 to 8, it is characterised in that described life
The described HTTP request message becoming unit to generate includes the range information for indicating described target subrange.
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