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You export your WordPress site to static HTML. Your contact form stops working. You see a 404 error in the console.

Contact Form 7 needs PHP. It uses a REST API to process data. Static sites have no PHP. No PHP means no REST API.

Some people blame CORS. A CORS header will not fix a missing server. You need a backend to handle the email.

If you use Simply Static Pro, check your file permissions. A missing JS file causes this error. Run this command:

chmod 644 /var/www/html/wp-content/plugins/simply-static-pro/assets/ssp-form-webhook-public.js

Run the export again.

Two ways to fix this:

How to debug:

Stop treating symptoms. Fix your architecture.

Source: https://dev.to/rahul_sharma_15bd129bc69e/why-contact-form-7-breaks-on-static-sites-and-what-to-do-about-it-jg5