Mailchimp form in AMP pages

The form submission is going to another domain, yes?

I believe this is the same issue as reported here: https://github.com/ampproject/amp-wp/issues/4191

We have a fix in the works that will solve that problem by implementing a proxy endpoint: https://github.com/ampproject/amp-wp/pull/4212

First thanks for the fast response,
I believe I’m using the same domain, after subscribning *redirecting
and it appears on every post I have, like this:

VM8316:1 POST https://majana.blog/wp-json/mc4wp/v1/form?_gl=1*bq6z7r*_ga*NjMzNjcxOTM0LjE1OTg4MDAwNTY.&__amp_source_origin=https%3A%2F%2Fmajana.blog 406
(anonymous) @ VM8316:1
(anonymous) @ v0.js:139
Promise.then (async)
f.Lg @ v0.js:139
mg @ v0.js:140
f.fetch @ v0.js:141
push.f.k.ba @ amp-form-0.1.js:82
Gc @ amp-form-0.1.js:75
(anonymous) @ amp-form-0.1.js:74
Promise.then (async)
(anonymous) @ amp-form-0.1.js:74
Promise.then (async)
uc @ amp-form-0.1.js:74
(anonymous) @ amp-form-0.1.js:67
Promise.then (async)
push.f.k.Da @ amp-form-0.1.js:67
Hf @ v0.js:124
f.execute @ v0.js:118
Bh @ v0.js:188
v0.js:23 [amp-form] Form submission failed: Error: HTTP error 406???
    at gb (https://cdn.ampproject.org/v0.js:30:169)
    at ab.f.createError (https://cdn.ampproject.org/v0.js:25:149)
    at https://cdn.ampproject.org/v0.js:139:399
    at new Promise (<anonymous>)
    at kg (https://cdn.ampproject.org/v0.js:139:334)
    at https://cdn.ampproject.org/v0.js:141:276
eb @ v0.js:23
f.Ja @ v0.js:24
f.error @ v0.js:24
Ic @ amp-form-0.1.js:84
(anonymous) @ amp-form-0.1.js:84
Promise.then (async)
Nc @ amp-form-0.1.js:84
(anonymous) @ amp-form-0.1.js:75
Promise.then (async)
Gc @ amp-form-0.1.js:75
(anonymous) @ amp-form-0.1.js:74
Promise.then (async)
(anonymous) @ amp-form-0.1.js:74
Promise.then (async)
uc @ amp-form-0.1.js:74
(anonymous) @ amp-form-0.1.js:67
Promise.then (async)
push.f.k.Da @ amp-form-0.1.js:67
Hf @ v0.js:124
f.execute @ v0.js:118
Bh @ v0.js:188

I have Also check implement form submission proxy, but I didnt know where to put it exactly on my “class-amp-form-sanitizer.php”

and for the response header method, I couldnt find where this file is, is it in .htaccess file? or we-include? ? im sorry, but it is a little bit confusing to me and i cant find steps to follow

OK, thanks for that additional info.

In that case, I believe what you’re actually encountering is an issue with ModSecurity not being configured properly. In particular, your server is rejecting requests that have an __amp_source_origin query parameter present. Please review this documentation for more information: https://amp-wp.org/documentation/playbooks/handling-form-submissions/#dealing-with-modsecurity-failures

You’ll probably have to contact your host to get that exception put in place. We’ve had reports of this happening at Bluehost and the fix is simply to contact support to add that query parameter to the allowlist.