Warning: Cannot modify header information – headers already sent

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You might receive an error message on your browser “Warning: Cannot modify header information – headers already sent by (output started at /path/wp_demo/wp-config.php:34)” right after upgrading your WordPress or a new WordPress installation.

Solution:

Remove spaces, new lines, or other garbage in wp-config.php

For instance,

Open wp-config.php from your root WordPress installation.

Now check and remove all spaces before <?php

and Scroll down to check and remove all spaces after ?>

*This error could happen on other files too. Read the error message carefully as it states the specific file name where the error occurred. For other files follow the same procedure.

WP Guru

WP Guru

Welcome to wpguru.co! I'm Dilip, the founder and chief WordPress expert at WP Guru. With over 10 years of experience in web development and WordPress, I've dedicated my career to helping individuals and businesses create, optimize, and maintain their WordPress websites. I specialize in custom theme and plugin development, plugin integrations, and performance optimization. I also have expertise in Headless WordPress with NextJS, providing modern and highly responsive web solutions. My mission is to empower you with the tools and knowledge you need to succeed online. Whether you're a blogger, an entrepreneur, or running a large enterprise, I'm here to support you every step of the way. Thanks for stopping by WP Guru. Let's make your WordPress journey exceptional together!

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