Merge pull request #242 from righettod/master

Fix broken ref.

Author: riramar

tab_casestudies.md

@@ -56,7 +56,7 @@ https://owasp.org/www-project-secure-headers/index.html#div-technical_php
 * [Zoom](https://developers.zoom.us/docs/zoom-apps/security/owasp/).
 * [VeraCode](https://docs.veracode.com/r/enable-security-headers).
 * [Ivanti](https://forums.ivanti.com/s/article/HTTP-Security-Headers-X-Frame-Options-X-XSS-Protection-X-Content-Type-Options).
-* [Government Technology Agency of Singapore GovTech](https://info.standards.tech.gov.sg/control-catalog/as/).
+* [Government Technology Agency of Singapore GovTech](https://info.standards.tech.gov.sg/control-catalog/cybersecurity/as/).
 * [HCL Volt MX](https://opensource.hcltechsw.com/volt-mx-docs/docs/documentation/Foundry/voltmx_Foundry_deployment_guide/Content/Hardening_Guide.html).
 * [Missouri State Website](https://assets.mo.gov/samples/security/security-headers.html).
 * [SAS](https://documentation.sas.com/doc/en/sasadmincdc/v_054/viyaov/p0i3vcgjpciz45n1of1v4vkffwbn.htm).

tab_headers.md

@@ -215,7 +215,6 @@ X-Permitted-Cross-Domain-Policies: none
 ### References
 
 * [https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/xdomain.html](https://www.adobe.com/devnet-docs/acrobatetk/tools/AppSec/xdomain.html "SKIP_VALIDATION")
-* <https://rorsecurity.info/portfolio/new-http-headers-for-more-security>
 
 ## Referrer-Policy