Accelerated domain name |
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Origin server |
- Address length: The address of an origin server cannot exceed 67 characters in length.
- Maximum number of origin servers: You can set a maximum of 20 origin server addresses for each accelerated domain
name.
- OSS Domain
- If you use an Object Storage Service (OSS) bucket as the origin server, you can enter
the public domain name of the OSS bucket, for example,
***.oss-cn-hangzhou.aliyundoc.com . Internal domain names of OSS buckets are not supported.
- You can view the public domain name of an OSS bucket in the OSS console. You can also select an OSS bucket that belongs to the current Alibaba Cloud account
from the Domain Name drop-down list.
- IP: Enter the public IP addresses of one or more servers. Public IP addresses of Alibaba
Cloud Elastic Compute Service (ECS) instances do not need to be reviewed.
- Site Domain: Enter the domain names of one or more origin servers.
Note
- The origin domain name must be different from the accelerated domain name. If the
origin domain name is the same as the accelerated domain name, a DNS resolution loop
occurs, and requests cannot be redirected to the origin server.
- The domain name must be in lowercase letters.
- If a domain name contains Chinese characters, such as 阿里云.网址, you must apply for an
ICP number for the domain name and use the Punnycode tool to convert the Chinese domain
name to an English domain name, such as xn--fiq****.xn--eq****.
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CNAME |
CNAMEs that are assigned by Alibaba Cloud CDN, DCDN, ApsaraVideo Live, ApsaraVideo
VOD, or Secure CDN (SCDN) are used only for domain name resolution. If Alibaba Cloud
discovers that your CNAME is used for malicious activities, Alibaba Cloud reserves
the right to close your Alibaba Cloud account and remove the domain names.
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Service quota |
- Accelerated domain name
Each Alibaba Cloud account can add up to 50 domain names to DCDN. If the average daily
peak bandwidth value exceeds 50 Mbit/s and your workloads are protected, you can submit a ticket to add more domain names to DCDN.
- Cache refresh
- URL refresh: 10,000 URLs per day for each Alibaba Cloud account.
- Directory refresh: 100 directories per day for each Alibaba Cloud account.
If the daily peak bandwidth value of your workloads exceeds 200 Mbit/s, you can submit a ticket to request a quota increase. After your application is approved, Alibaba Cloud increases
the quota based on your business requirements.
- File prefetch
You can prefetch files only by using URLs. Each Alibaba Cloud account can submit up
to 1,000 URLs per day.
If the daily peak bandwidth value of your workloads exceeds 200 Mbit/s, you can submit a ticket to request a quota increase. After your application is approved, Alibaba Cloud increases
the quota based on your business requirements.
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Content moderation |
Alibaba Cloud reviews the content of all accelerated domain names. Domain names that
cannot be accelerated by DCDN include but are not limited to:
- Websites whose content is inaccessible or does not provide valid information
- Servers that host pirated games
- Websites that provide multiplayer role-playing games and card games
- Websites that provide downloads of pirated software
- Websites that run peer-to-peer (P2P) lending
- Unofficial lottery websites
- Websites of unlicensed hospitals and pharmaceuticals
- Websites that contain pornography, drugs, and gambling content
Note
- You are legally responsible for the content hosted on your accelerated domain name.
DCDN regularly reviews the content of accelerated domain names. If illicit content
is detected from a domain name, DCDN immediately disables or blocks the domain name.
If the violation is severe, DCDN may even permanently block all domain names that
belong to the Alibaba Cloud account.
- If you add a wildcard domain name, for example,
*.example.com , to DCDN and a specific domain name, for example, a.example.com , that matches the wildcard domain name contains illicit content, DCDN disables the
wildcard domain name *.example.com .
- If a domain name fails the review, you can check the reason for rejection on the Domain
Names page in the DCDN console. Then, you can modify the content based on the rejection
details and submit the domain name for review again.
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Origin fetch |
- An HTTP request header cannot exceed 300 bytes.
- The timeout period.
By default, the timeout period for back-to-origin requests that are transmitted over
TCP is 10 seconds. The timeout period for back-to-origin requests that are transmitted
over HTTP is 30 seconds.
- Response header
If an origin server does not respond to Content-Type , DCDN automatically adds Content-Type:application/octet-stream .
- Automatic conversion from HEAD to GET for back-to-origin requests
By default, HEAD requests are sent to DCDN nodes before the requests are redirected
to origin servers. In this case, HEAD requests are converted to GET requests. If you
do not want to convert HEAD requests to GET requests, you can navigate to the Custom
Origin HTTP Header tab in the DCDN console, and configure custom HTTP headers for
back-to-origin requests. For more information, see Configure a custom origin HTTP header.
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Bandwidth throttling |
Based on the Alibaba Cloud International Website Product Terms of Service, if the metering method of your domain name is pay-by-data-transfer or pay-by-bandwidth
and the peak bandwidth value reaches 10 Gbit/s within 1 minute, Alibaba Cloud enables
bandwidth throttling for the domain name. Bandwidth throttling protects your domain
name from attacks and prevents unexpected high bills. If you want to disable bandwidth
throttling, you can contact Alibaba Cloud customer service or submit ticket.
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File |
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EdgeScript |
By default, you can configure only one script for each domain name. If you want to
configure more scripts, submit a ticket.
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Stress testing |
If you want to run stress tests on a domain name that is accelerated by DCDN, you
must submit ticket at least three days in advance. Otherwise, you may experience the following issues:
Stress tests on the number of queries per second (QPS) may trigger HTTP flood protection
rules of DCDN and the domain name is added to a sandbox.
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Length of URLs and HTTP request headers, and total length of URLs and HTTP request
headers
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HTTP/2:
- If the default setting of the NGINX directive is http2_max_field_size=32 KB, the length
of an individual HTTP request header or an individual URL cannot exceed 32 KB. Otherwise,
the HTTP 414 status code is returned.
- If the default setting of the NGINX directive is http2_max_header_size=128 KB, the
total length of all HTTP request headers and URLs cannot exceed 128 KB. Otherwise,
the HTTP 400 status code is returned.
HTTP/1.1: For the large_client_header_buffers directive, number is set to 4 and size
is set to 64 KB. In this case, the length of an individual HTTP request header or
an individual URL cannot exceed 64 KB. Otherwise, the HTTP 414 status code is returned.
The total length of all HTTP request headers and URLs cannot exceed 256 KB. Otherwise,
the HTTP 400 status code is returned.
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Request methods |
DCDN supports the GET , PUT , POST , and HEAD request methods.
Note
- If you want your website to support
DELETE and PATCH requests, use DCDN to enable acceleration for dynamic content delivery.
- Only HTTP
POST and PUT requests can carry a request body.
- By default, DCDN converts HEAD requests to GET requests before the requests are redirected
to the origin server. If you want to redirect HEAD requests to the origin server,
you can add a custom request header on the Custom Origin HTTP Header tab in the DCDN console. For more information, see Configure a custom origin HTTP header.
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Intelligent and Brotli compression |
Only files that are not smaller than 1 KB are compressed. |
API calls for each account |
The maximum number of times that each account can call DCDN API operations is 1,000
per second. If this upper limit is reached, the following message is returned:ErrorCode:Throttling
ErrorMessage:Request was denied due to flow control.
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