Site Map Error, help

Hello,

We apologize for the issue you are facing with your sitemap. The error ‘Incorrect HTTP header content-type’ typically occurs when the server is returning a different content type than expected for your sitemap. Here are some steps you can take to resolve this issue:

1. Flush Permalinks

• Navigate to WordPress Dashboard → Settings → Permalinks.
• Click the Save Changes button without making any changes. This will flush your permalinks.

2. Flush Sitemap Settings

• Go to Rank Math SEO → Sitemap Settings in your WordPress admin area.
• Change the value in the Links Per Sitemap (e.g., if it is 200, change it to 201) and click Save Changes.

3. Exclude Sitemap from Caching

• Ensure that your sitemap is not being cached by any caching plugins. You can follow this tutorial to exclude your sitemap from caching.

4. Check Restrictions from Web Host

• If you can access the sitemap directly but encounter issues with external validators, check if your web host or a security plugin is blocking access to the sitemap. You may need to adjust settings or contact your web host for assistance.

5. Add Filter to Theme’s rank-math.php File

• If the above solutions do not work, you can add a filter to your theme’s rank-math.php file:

  add_filter( 'rank_math/sitemap/enable_caching', '__return_false');

• Make sure to back up your site before making changes to PHP files.

After trying these steps, please check your sitemap again using the validator. If you continue to experience issues, please reply to this ticket with your site URL so we can assist you further.

Sources:
How to Fix "Incorrect HTTP Header Content-Type" Error in Sitemaps » Rank Math