What is Referrer URL Restriction? – Help Center | Teachme Biz

Overview

The referrer restriction is a feature that limits access to Folders released outside in Teachme Biz and the Manuals within those folders, based on the referrer URL (the URL of the page from which the user navigated).

Folders released outside can be viewed by users who are not logged into Teachme Biz (i.e., users without an account), but this feature allows you to restrict the viewing path.

※This feature may not be available depending on your subscription plan.

Conditions for Viewing

You can access a folder or a Manual within a folder if either of the following conditions is met.

Access is made from a registered referrer (a page permitted as a referrer)
Within 5 minutes of condition 1 being fulfilled

If both conditions 1 and 2 are met, the following actions can be performed without going through the referrer each time.

Click the Manual list screen of the relevant folder to open a Manual within the folder
Click a link within a Manual to open another Manual within the folder
Click a link within a Manual to open the Manual list screen of the relevant folder

When Access is Revoked

Access to Manuals within a folder will be revoked if any of the following conditions apply.
To view again, you will need to access from the registered referrer.

More than 5 minutes have passed since accessing from the registered referrer
A different folder with a referrer restriction or Password restriction has been accessed
The "Referrer URL" setting of the folder has been changed

Registration Examples

To allow "xxx.example.com" and "yyy.example.com"
→ Register as "example.com"
To allow "xxx.example.com" and "yyy.example.com" but not "zzz.example.com"
→ Register as "xxx.example.com,yyy.example.com"
To allow viewing via a link placed on the page "https://xxx.example.com/portal/manual"
→ Register as "xxx.example.com" (do not include "/portal/manual")

Referrer Restriction Feature Limits

Number of Referrer URLs

Multiple entries can be registered by using a comma as a delimiter
However, the total combined length of all registered referrers, including the comma delimiters, is limited to 1,000 characters

Notes and Supplementary Information

Depending on the environment of the permitted referrer page, if referrer information is not retained, the referrer restriction feature cannot be used.
However, it may be possible to work around this issue by implementing a "meta referrer" tag, which can specify the sending of referrer information when navigating to another page via a link.
For details, please check with the provider of the environment for the permitted referrer page.
The specified referrer URL is evaluated based on the domain.
If you register without "https://", such as "example.com", access from that domain and its subdomains (e.g., xxx.example.com) will be permitted.
If you register starting with "https://", such as "https://example.com", only access from that exact domain will be permitted (subdomains are not included).
If a port number is included in the registration, access will only be permitted when the port number also matches.
Please register the Referrer URL up to the domain level (e.g., "example.com" or "https://example.com").
If you register a path such as "xxx.example.com/manual", or include a parameter starting with "?" such as "xxx.example.com/search?query=Search keywords", viewing will only be permitted when both the path and parameters match exactly.
Major Browsers, even with default settings, only send the domain as the referrer when navigating to a different site.
Therefore, if a path or parameter is included in the registration, it will not match, and viewing will not be possible even when navigating from the registered page.