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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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