How Can I Force HTTPS Redirection Using a Web.config File?

Enforce HTTPS with Web.config for Enhanced Security

Seeking a comprehensive solution to redirect all traffic to HTTPS, a user encounters complexities when working with IIS and web.config files, particularly as they lack familiarity with ASP.NET. This article aims to provide a straightforward guide for effectively implementing HTTPS redirection using a web.config file.

The URL Rewrite module is an essential component for forcing HTTPS. Here's an example web.config configuration that ensures HTTPS for all resources through 301 Permanent Redirects:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <system.webServer>
        <rewrite>
            <rules>
                <clear />
                <rule name="Redirect to https" stopProcessing="true">
                    <match url=".*" />
                    <conditions>
                        <add input="{HTTPS}" pattern="off" ignoreCase="true" />
                    </conditions>
                    <action type="Redirect" url="https://{HTTP_HOST}{REQUEST_URI}" redirectType="Permanent" appendQueryString="false" />
                </rule>
            </rules>
        </rewrite>
    </system.webServer>
</configuration>

It's important to note that this redirection is not dependent on ASP.NET or PHP, relying solely on URL rewriting mechanisms that intercept requests before code execution. By implementing this solution, you can enhance the security of your website and ensure consistent HTTPS usage across all assets.

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