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What Is HSTS (HTTP Strict Transport Security) and How Is It Configured?

HSTS (HTTP Strict Transport Security) is a security protocol that enforces websites to operate exclusively over HTTPS. In this article, you can find detailed information about what HSTS is, how it works, how it is configured, and how it can be disabled.

What Is HSTS (HTTP Strict Transport Security) and How Is It Configured?
Digital Transformation Publication Date - Update Date
1.

What Is HSTS?

The HSTS protocol, designed as a security solution for websites, enforces communication with browsers exclusively over HTTPS connections. In this way, it aims to ensure user security by preventing attacks such as Man-in-the-Middle. By continuing to read, you can find answers to questions such as what is HSTS, what it does, how it is configured, how it is disabled, how errors are resolved, and gain a comprehensive understanding of the topic.

HSTS (HTTP Strict Transport Security), as briefly mentioned above, is a security policy that informs browsers that websites must only be accessed via HTTPS. The server enforces the use of a secure connection for a specified duration by sending a special "header" to the browser. As a result, once a user connects to a site via HTTPS for the first time, the browser will automatically use HTTPS instead of HTTP for subsequent visits. The primary purpose of HSTS is to eliminate vulnerabilities that may arise from unencrypted HTTP connections and to ensure the protection of user data. In this way, it aims to prevent data interception or manipulation attempts such as Man-in-the-Middle attacks. In short, HSTS prevents websites from being accessed over HTTP, thereby significantly reducing the likelihood of users being unintentionally redirected to an insecure connection.

What Is HSTS?
2.

What Does HSTS Do?

So, what does HSTS do? This protocol, whose primary purpose is to ensure user security on the internet, provides advantages in many areas, from automatic redirection to SSL stripping protection, from security certificate warnings to performance improvements. In the list below, you can see the advantages of HSTS itemized with explanations.

  • Automatic HTTPS Redirection: Ensures that browsers automatically switch to a secure connection on every visit to the site, eliminating the need for manual redirection.
  • SSL Protection: Although it does not perform data encryption itself, it enforces that all communication takes place over the encrypted SSL/TLS layer, thereby preventing attacks such as SSL Stripping.
  • Security Certificate Warnings: In cases of invalid or expired SSL certificates, it strictly prevents users from bypassing security warnings (via the "proceed anyway" option) (hard-fail), thereby ensuring uncompromising security.
  • Performance Improvement in Connections: Since connections are consistently established over HTTPS, redirection processes are reduced, leading to an indirect improvement in page load speed.
What Does HSTS Do?
3.

How Is HSTS Configured?

The answer to the question how is HSTS configured begins with obtaining an SSL certificate. After acquiring the certificate, all HTTP requests are redirected to HTTPS using a 301 redirect. Finally, the Strict-Transport-Security directive is added to the server response headers, completing the process. When these steps are implemented correctly, HSTS becomes active and significantly enhances site security.

  • Obtaining an SSL/TLS Certificate: A valid SSL/TLS certificate must be installed for the website to operate over a secure connection. This certificate forms the fundamental security layer by encrypting data communication.
  • Configuring HTTPS Redirection: All requests received over HTTP are redirected to HTTPS via a 301 redirect on the server side. This step ensures that users are automatically directed to a secure connection.
  • Adding the Header to the Server: The Strict-Transport-Security (HSTS) header is added to server responses, informing browsers that connections must be established exclusively over HTTPS for a specified period.
4.

How Is HSTS Disabled?

Another important question in this context is "how is HSTS disabled?". By continuing to read, you can see the detailed steps for this process across different browsers.

Google Chrome

To remove an HSTS entry in Google Chrome, type chrome://net-internals/#hsts into the address bar. On the page that opens, enter the relevant domain in the “Delete domain security policies” section and delete the record. After this process, the browser will start evaluating the site again without an HTTP/HTTPS policy.

Mozilla Firefox

In Mozilla Firefox, HSTS settings are generally managed through cookies and site data. For the affected site, clearing browsing history and site data can indirectly reset the HSTS record. If necessary, more advanced technical interventions can also be performed via the hidden settings page.

Safari

In Safari, HSTS records are not directly managed via the user interface. Therefore, it is usually necessary to clear browser history and site data. In advanced cases, the HSTS effect can be removed by clearing caches at the macOS level.

You may also be interested in our article titled Methods to Protect Your Business Against Cyber Attacks.

5.

Frequently Asked Questions

You cannot visit this site right now because it uses HSTS—what does it mean?

This warning indicates that the website you are trying to visit allows access only over a secure (HTTPS) connection due to its HSTS policy. When the browser attempts to access the site over an insecure connection (HTTP), it displays this error. This situation is typically caused by SSL certificate errors or misconfigured redirection settings.

How can an HSTS error be resolved?

To resolve an HSTS error, first ensure that the site’s SSL/TLS certificate is valid and properly configured. Then, check the redirections from HTTP to HTTPS and, if necessary, clear the HSTS record from the browser. The Strict-Transport-Security header on the server side should also be reviewed to ensure proper configuration.

Can a site be accessed via HTTP when HSTS is active?

No. When HSTS is active, the browser allows connections to the site only over HTTPS. All requests over HTTP are automatically blocked or redirected to HTTPS.

Is HSTS required for every website?

It is not mandatory for every website; however, it provides a strong security layer especially for websites that collect user data, have authentication systems, or conduct e-commerce operations. For simple content websites, it can be used optionally.

What happens if HSTS is misconfigured?

In case of misconfiguration, access to the site may be completely blocked, or the browser may continuously display security errors. In particular, if HSTS is enabled without an SSL certificate, users may not be able to access the site.

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