There are several popular web server compliance standards that organizations can adhere to in order to ensure security, privacy, and regulatory compliance. Some of the widely recognized compliance standards for web servers include:

1. Payment Card Industry Data Security Standard (PCI DSS): PCI DSS is a set of security standards established by major credit card companies to protect cardholder data. It applies to organizations that handle payment card transactions and mandates specific security controls for web servers involved in payment processing.
2. General Data Protection Regulation (GDPR): GDPR is a European Union regulation that governs the protection of personal data. While it is not specific to web servers, compliance with GDPR is essential for organizations that collect, process, or store personal data of individuals within the EU.
3. Health Insurance Portability and Accountability Act (HIPAA): HIPAA sets standards for the protection of sensitive healthcare information in the United States. Web servers that handle healthcare data must comply with HIPAA regulations to ensure the privacy and security of patient information.
4. Federal Information Security Management Act (FISMA): FISMA is a US federal law that outlines security requirements for federal agencies’ information systems. It sets guidelines for risk management, security controls, and continuous monitoring of web servers and other IT systems.
5. ISO 27001: ISO 27001 is an international standard for information security management systems (ISMS). It provides a framework for organizations to establish, implement, maintain, and continually improve their information security processes. Compliance with ISO 27001 demonstrates a commitment to protecting sensitive information, including data hosted on web servers.
6. National Institute of Standards and Technology (NIST) Cybersecurity Framework: The NIST Cybersecurity Framework provides a voluntary framework for organizations to manage and improve their cybersecurity posture. It offers guidelines and best practices for securing web servers and other IT assets.
7. Sarbanes-Oxley Act (SOX): SOX is a US federal law that mandates financial reporting and auditing requirements for publicly traded companies. Web servers hosting financial systems or data must comply with SOX controls to ensure the accuracy, integrity, and security of financial information.
8. Web Content Accessibility Guidelines (WCAG): WCAG is a set of international guidelines developed by the World Wide Web Consortium (W3C) to ensure web content accessibility for people with disabilities. While not strictly a compliance standard, adherence to WCAG is important for web servers hosting public-facing websites to ensure accessibility for all users.

It’s important to note that compliance requirements may vary based on the industry, region, and specific organizational needs. Organizations should assess their specific compliance obligations and consult with legal and cybersecurity professionals to determine the applicable standards and ensure compliance with relevant regulations.