How Can I Force HTTPS on My Website Using IIS 7.5 and web.config?

Force HTTPS with web.config: A Beginner's Guide for IIS 7.5

Enforcing HTTPS on your website ensures secure data transmission and enhances user privacy. While familiarizing yourself with IIS and web.config files may seem daunting, it's relatively straightforward to achieve HTTPS redirection using a web.config file.

Solution: Utilize URL Rewrite Module

To redirect all website resources to HTTPS, you'll require the URL Rewrite module, ideally version 2. Here's how to implement it:

1. In your web.config file, add the following content:

<?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>

This code instructs the URL Rewrite module to redirect all non-HTTPS requests (pattern="off") to their HTTPS counterparts using a permanent 301 redirect. Note that this solution is language-agnostic and works with any web content.

Additional Considerations

• Remember to replace {HTTP_HOST} with your website's domain name in the redirect action.
• This approach forces HTTPS globally, affecting all assets, including images, CSS, and JavaScript.
• Be aware that HTTPS requires a valid SSL certificate for your server.

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