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Log Service

Last updated: 2025-01-25 15:05:13
    Notice:
    Field value "HTTP/3" for the HTTP protocol identifier (the 14th field in the offline log) in general logs will be in beta from September 13, 2021, which will not affect the CDN console and APIs. Please note that getting log data from offline log packages may require adjustment.<
    
    QUIC access has been in beta. For more details, see QUIC.

    Features

    After a domain name is connected to CDN, all requests will be scheduled to a CDN node. If the requested resource is cached on the node, the resource will be returned directly; otherwise, the request will be passed to the origin server to pull the requested resource.
    CDN nodes respond to most of the user requests. To facilitate access analysis, CDN packages access logs of the entire network at an hourly granularity and retains them for 30 days by default. These logs can also be downloaded.
    Note:
    Currently origin-pull logs are not provided. Only node access logs are provided.
    ECDN domain name offline logs cannot be queried by regions for now. For more information, see Log Management.

    Use Cases

    Access behavior analysis

    You can download access logs and analyze popular resources and active users.

    Service quality monitoring

    By downloading access logs, you can stay on top of the service status of all CDN nodes and calculate the average response time, average download speed, and other metrics.

    Directions

    How to use

    Log in to the CDN console, click Log Service on the left sidebar, and select a domain name and time range to query access logs. You can select multiple log packages and download them in batches:
    Note:
    The access logs are packaged by hour by default. If there is no request to the domain name for the hour, no log package will be generated for this hour.
    For the same domain name, logs of accesses from within and outside the Chinese mainland are packaged separately. Log packages are named in the format of "[time]-[domain name]-[acceleration region]".
    The access logs are collected from each CDN cache node, so the delay may vary. Generally, the delay for querying and downloading log packages is about 30 minutes. Log packages will be added continuously and will stabilize after around 24 hours.
    The access log packages of a domain name are retained for 30 days. You can use an SCF function to transfer the log packages to COS as instructed in Regularly Storing CDN Logs for permanent storage.

    Fields

    The fields (from left to right) in the logs are listed as below:
    No.
    Fields
    1
    Request time
    2
    Client IP
    3
    Domain name
    4
    Request path
    5
    Number of bytes accessed this time, including the size of the file itself and the size of the request header.
    6
    Province numbers for Chinese mainland logs; region numbers for logs outside the Chinese mainland (see the mapping table below).
    7
    ISP numbers for Chinese mainland logs; -1 will be used for logs outside the Chinese mainland (see the mapping table below).
    8
    HTTP status code
    9
    Referer information
    10
    Response time (in milliseconds), which refers to the time it takes for a node to return all packets to the client after receiving a request.
    11
    User-Agent information
    12
    Range parameter
    13
    HTTP method
    14
    HTTP protocol identifier
    15
    Cache hit/miss. A hit in a CDN edge server or parent node will be marked as hit.

    Region/ISP mappings

    

    Chinese mainland provinces

    Region ID
    Region
    Region ID
    Region
    Region ID
    Region
    22
    Beijing
    86
    Inner Mongolia
    146
    Shanxi
    1069
    Hebei
    1177
    Tianjin
    119
    Ningxia
    152
    Shaanxi
    1208
    Gansu
    1467
    Qinghai
    1468
    Xinjiang
    145
    Heilongjiang
    1445
    Jilin
    1464
    Liaoning
    2
    Fujian
    120
    Jiangsu
    121
    Anhui
    122
    Shandong
    1050
    Shanghai
    1442
    Zhejiang
    182
    Henan
    1135
    Hubei
    1465
    Jiangxi
    1466
    Hunan
    118
    Guizhou
    153
    Yunnan
    1051
    Chongqing
    1068
    Sichuan
    1155
    Tibet
    4
    Guangdong
    173
    Guangxi
    1441
    Hainan
    0
    Other
    1
    Hong Kong (China), Macao (China), and Taiwan (China)
    -1
    Outside the Chinese mainland
    
    
    
    

    Chinese mainland ISPs

    ISP ID
    ISP
    ISP ID
    ISP
    ISP ID
    ISP
    2
    China Telecom
    26
    China Unicom
    38
    CERNET
    43
    Great Wall Broadband Network
    1046
    China Mobile
    3947
    China Mobile Tietong
    -1
    ISPs outside the Chinese mainland
    0
    Other ISPs
    
    

    Regions outside the Chinese mainland

    Region ID
    Region
    Region ID
    Region
    Region ID
    Region
    2000000001
    Asia Pacific Zone 1 (service area)
    765
    Slovakia
    1613
    Angola
    2000000002
    Asia Pacific Zone 2 (service area)
    766
    Serbia
    1617
    Ivory Coast
    2000000003
    Asia Pacific Zone 3 (service area)
    770
    Finland
    1620
    Sudan
    2000000004
    Middle East (service area)
    773
    Belgium
    1681
    Mauritius
    2000000005
    North America (service area)
    809
    Bulgaria
    1693
    Morocco
    2000000006
    Europe (service area)
    811
    Slovenia
    1695
    Algeria
    2000000007
    South America (service area)
    812
    Moldova
    1698
    Guinea
    2000000008
    Africa (service area)
    813
    Macedonia
    1730
    Senegal
    -20
    Asia (client area)
    824
    Estonia
    1864
    Tunisia
    -21
    South America (client area)
    835
    Croatia
    1909
    Uruguay
    -22
    North America (client area)
    837
    Poland
    1916
    Greenland
    -23
    Europe (client area)
    852
    Latvia
    2026
    Taiwan (China)
    -24
    Africa (client area)
    857
    Jordan
    2083
    Myanmar
    -25
    Oceania (client area)
    884
    Kyrgyzstan
    2087
    Brunei
    35
    Nepal
    896
    Ireland
    2094
    Sri Lanka
    57
    Thailand
    901
    Libya
    2150
    Panama
    73
    India
    904
    Armenia
    2175
    Colombia
    144
    Vietnam
    921
    Yemen
    2273
    Monaco
    192
    France
    926
    Belarus
    2343
    Andorra
    207
    United Kingdom
    971
    Luxembourg
    2421
    Turkmenistan
    208
    Sweden
    1036
    New Zealand
    2435
    Laos
    209
    Germany
    1044
    Japan
    2488
    East Timor
    213
    Italy
    1066
    Pakistan
    2490
    Tonga
    214
    Spain
    1070
    Malta
    2588
    Philippines
    386
    United Arab Emirates
    1091
    Bahamas
    2609
    Venezuela
    391
    Israel
    1129
    Argentina
    2612
    Bolivia
    397
    Ukraine
    1134
    Bangladesh
    2613
    Brazil
    -
    -
    1158
    Cambodia
    2623
    Costa Rica
    417
    Kazakhstan
    1159
    Macao (China)
    2626
    Mexico
    428
    Portugal
    1176
    Singapore
    2639
    Honduras
    443
    Greece
    1179
    Maldives
    2645
    El Salvador
    471
    Saudi Arabia
    1180
    Afghanistan
    2647
    Paraguay
    529
    Denmark
    1185
    Fiji
    2661
    Peru
    565
    Iran
    1186
    Mongolia
    2728
    Nicaragua
    578
    Norway
    1195
    Indonesia
    2734
    Ecuador
    669
    United States
    1200
    Hong Kong (China)
    2768
    Guatemala
    692
    Syria
    1233
    Qatar
    2999
    Aruba
    704
    Cyprus
    1255
    Iceland
    3058
    Ethiopia
    706
    Czech
    1289
    Albania
    3144
    Bosnia and Herzegovina
    707
    Switzerland
    1353
    Uzbekistan
    3216
    Dominican
    708
    Iraq
    1407
    San Marino
    3379
    South Korea
    714
    Netherlands
    1416
    Kuwait
    3701
    Malaysia
    717
    Romania
    1417
    Montenegro
    3839
    Canada
    721
    Lebanon
    1493
    Tajikistan
    4450
    Australia
    725
    Hungary
    1501
    Bahrain
    4460
    Chinese mainland
    726
    Georgia
    1543
    Chile
    -15
    Asia - other
    731
    Azerbaijan
    1559
    South Africa
    -14
    South America - other
    734
    Austria
    1567
    Egypt
    -13
    North America - other
    736
    Palestine
    1590
    Kenya
    -12
    Europe - other
    737
    Türkiye
    1592
    Nigeria
    -11
    Africa - other
    759
    Lithuania
    1598
    Tanzania
    -10
    Oceania - other
    763
    Oman
    1611
    Madagascar
    -2
    Outside the Chinese mainland - other
    

    ISPs outside the Chinese mainland

    ISP ID
    ISP
    -1
    ISPs outside the Chinese mainland
    

    Notes

    The traffic/bandwidth data calculated based on the number of bytes recorded in the fifth field of an access log is different from the billable CDN traffic/bandwidth data for the following reason:
    Only application-layer data can be recorded in access logs. During actual data transfer, the traffic generated over the network is around 5-15% more than the application-layer traffic, including the following two parts:
    Consumption by TCP/IP headers: in TCP/IP-based HTTP requests, each packet has a maximum size of 1,500 bytes and includes TCP and IP headers of 40 bytes, which generate traffic during transfer but cannot be counted by the application layer. The overhead of this part is around 3%.
    TCP retransmission: during normal data transfer over the network, around 3% to 10% of packets are lost on the Internet and retransmitted by the server. This type of traffic, which accounts for 3-7% of the total traffic, cannot be counted at the application layer.
    As an industry standard, the billable traffic is the sum of the application-layer traffic and the overheads described above. Tencent Cloud CDN takes 10% as the overheads proportion, so the monitored traffic is around 110% of the logged traffic.

    Examples

    Sample log of accesses from within the Chinese mainland

    

    Sample log of accesses from outside the Chinese mainland

    
    
    
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