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SQL Server Reporting Services
A SQL Server technology that supports the creation, management, and delivery of both traditional, paper-oriented reports and interactive, web-based reports.
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According to the official documentation, the custom header is applicable to Reporting Services 2019 and a higher version.
You may need a higher version of the Reporting Service to add the matching request of the "Strict-Transport-Security" field to the header.
For more information, you can refer to the examples in this document: Server Properties Advanced Page - Power BI Report Server & Reporting Services.
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Best regards,
Aniya