URL validation failed error

(@kerm131)

@jamesosborne sorry, the mentioned plugin is turned off. AMP works again

James Osborne

(@jamesosborne)

@kerm131 As you’re using the plugin in standard mode all those validation errors are handled by the plugin. Can you share your full Site Health information and we can investigate the notice you’ve been encountering?

Thread Starter

(@kerm131)

@jamesosborne


### wp-core ###

version: 5.4.1
site_language: ru_RU
user_language: ru_RU
timezone: +03:00
permalink: /%category%/%postname%/
https_status: true
user_registration: 0
default_comment_status: open
multisite: false
user_count: 1
dotorg_communication: true

### wp-paths-sizes ###

wordpress_path: /home/prodaite/bkb.by
wordpress_size: 45,79 MB (48014452 bytes)
uploads_path: /home/prodaite/bkb.by/wp-content/uploads
uploads_size: 27,98 MB (29335626 bytes)
themes_path: /home/prodaite/bkb.by/wp-content/themes
themes_size: 8,58 MB (9001653 bytes)
plugins_path: /home/prodaite/bkb.by/wp-content/plugins
plugins_size: 40,11 MB (42058415 bytes)
database_size: 7,13 MB (7479416 bytes)
total_size: 129,59 MB (135889562 bytes)

### wp-active-theme ###

name: Authentic (authentic)
version: 6.1.2
author: Code Supply Co.
author_website: http://codesupply.co
parent_theme: none
theme_features: editor-style, post-thumbnails, align-wide, title-tag, html5, automatic-feed-links, responsive-embeds, post-formats, canvas-disable-section-responsive, powerkit-post-format-ui, powerkit-post-featured-ui, jetpack-responsive-videos, amp, widgets, menus
theme_path: /home/prodaite/bkb.by/wp-content/themes/authentic

### wp-themes-inactive (3) ###

Twenty Nineteen: version: 1.5, author: Команда WordPress
Twenty Seventeen: version: 2.3, author: Команда WordPress
Twenty Twenty: version: 1.2, author: Команда WordPress

### wp-plugins-active (13) ###

Absolute Reviews: version: 1.0.4, author: Code Supply Co.
Advanced Popups: version: 1.0.3, author: Code Supply Co.
AMP: version: 1.5.3, author: AMP Project Contributors
Canvas: version: 2.0.2.2, author: Code Supply Co.
Contact Form 7: version: 5.1.7, author: Takayuki Miyoshi
Kirki Customizer Framework: version: 3.1.2, author: David Vongries
Loco Translate: version: 2.3.3, author: Tim Whitlock
One Click Demo Import: version: 2.5.2, author: ProteusThemes
Powerkit: version: 2.1.3.1, author: Code Supply Co.
Regenerate Thumbnails: version: 3.1.3, author: Alex Mills (Viper007Bond)
SearchWP Live Ajax Search: version: 1.4.6.1, author: SearchWP, LLC
VDZ Yandex Metrika Plugin: version: 1.4.5, author: VadimZ
Yoast SEO: version: 14.0.4, author: Team Yoast

### wp-plugins-inactive (2) ###

Accelerated Mobile Pages: version: 1.0.47, author: Ahmed Kaludi, Mohammed Kaludi
Autoptimize: version: 2.7.1, author: Frank Goossens (futtta)

### wp-media ###

image_editor: WP_Image_Editor_GD
imagick_module_version: Не доступно
imagemagick_version: Не доступно
gd_version: 2.2.5
ghostscript_version: 9.25

### wp-server ###

server_architecture: Linux 3.10.0-962.3.2.lve1.5.28.el7.x86_64 x86_64
httpd_software: LiteSpeed
php_version: 7.4.5 64bit
php_sapi: litespeed
max_input_variables: 1000
time_limit: 30
memory_limit: 512M
max_input_time: -1
upload_max_size: 200M
php_post_max_size: 64M
curl_version: 7.62.0 OpenSSL/1.0.2k
suhosin: false
imagick_availability: false
htaccess_extra_rules: true

### wp-database ###

extension: mysqli
server_version: 10.1.44-MariaDB-cll-lve
client_version: mysqlnd 7.4.5

### wp-constants ###

WP_HOME: undefined
WP_SITEURL: undefined
WP_CONTENT_DIR: /home/prodaite/bkb.by/wp-content
WP_PLUGIN_DIR: /home/prodaite/bkb.by/wp-content/plugins
WP_MAX_MEMORY_LIMIT: 512M
WP_DEBUG: false
WP_DEBUG_DISPLAY: true
WP_DEBUG_LOG: false
SCRIPT_DEBUG: false
WP_CACHE: false
CONCATENATE_SCRIPTS: undefined
COMPRESS_SCRIPTS: undefined
COMPRESS_CSS: undefined
WP_LOCAL_DEV: undefined
DB_CHARSET: utf8
DB_COLLATE: undefined

### wp-filesystem ###

wordpress: writable
wp-content: writable
uploads: writable
plugins: writable
themes: writable

### amp_wp ###

amp_mode_enabled: standard
amp_templates_enabled: post, page, attachment, is_singular, is_front_page, is_home, is_archive, is_author, is_date, is_search, is_404, is_category, is_tag
amp_serve_all_templates: true
amp_css_transient_caching_disabled: false
amp_css_transient_caching_threshold: 5000 transients per day
amp_css_transient_caching_sampling_range: 14 days
amp_css_transient_caching_transient_count: 134
amp_css_transient_caching_time_series: 
	20200508: 134

Plugin Author

(@westonruter)

Humm. In the past I saw this happen when a site had a plugin that tried injecting an HTML comment at the end of the response, and this caused the JSON to break.

That doesn’t seem to be the case here, however.

I have a debugging plugin for you which should help identify where the failure is.

Please install this extension plugin: https://gist.github.com/westonruter/48e546e4636bec5fafd8a29e0fc7a001

Once you activate, you’ll see two new menu items under the AMP admin bar menu item:

Debug AMP validation response directly
Debug AMP validation response w/ loopback request

When clicking either of those and things are working properly, you should see valid JSON data being returned in both cases.

I suspect the loopback request check (2) is going fail with the response_not_json issue. The direct request (1) should then reveal what exactly is in the JSON that is causing the problem.

Thread Starter

(@kerm131)

Errors: https://bkb.by/lombardy/kak-poluchit-bolee-vygodnyj-kredit-v-lombarde/?amp&amp_validate=1ce27565c666f968b3dda0e5d063310b

@westonruter Hello! Just installed plugin. Results:

[2] Debug AMP validation response w/ loopback request
{
“success”: false,
“results”: {
“errors”: {
“response_not_json”: [
“”
]
},
“error_data”: []
}
}

[1] Debug AMP validation response directly

Plugin Author

(@westonruter)

@kerm131 please copy to the output of the second one into a Gist, for example. And then share the URL to the Gist.

Thread Starter

(@kerm131)

@westonruter sorry for delay, here’s the link:https://gist.github.com/kerm131/781c698b20491e8f14014747e116853f

Plugin Author

(@westonruter)

@kerm131 Interesting. I don’t actually see any JSON validation error. I’m able to pass that into json_decode() locally in PHP and it parses fine.

The code in question that is failing in the plugin is this:

if ( '{' !== substr( $response, 0, 1 ) ) {
	return new WP_Error( 'response_not_json' );
}

So the first byte in the response is not { somehow. If I try getting the contents of the non-AMP page and pass it into a hex viewer like so:

curl -s https://bkb.by/lombardy/kak-poluchit-bolee-vygodnyj-kredit-v-lombarde/ | xxd | head -n 3

The first three lines I get back are the following:

00000000: efbb bf3c 2144 4f43 5459 5045 2068 746d  ...<!DOCTYPE htm
00000010: 6c3e 3c68 746d 6c20 6c61 6e67 3d22 7275  l><html lang="ru
00000020: 2d52 5522 3e3c 6865 6164 3e3c 6d65 7461  -RU"><head><meta

Notice the three dots before the doctype. The three dots correspond to these bytes: 0xEF, 0xBB, 0xBF. These are the infamous UTF-8 byte order mark (BOM). It seems the issue is that one of your PHP files was saved with this character and the result is it getting added to the beginning of the response, which is then breaking the JSON parsing.

Two things to do here:

1) On your side, try to identify what is causing that BOM character to be added.
2) On our side, we’ll make it so that this character is stripped out.

Plugin Author

(@westonruter)

I’ve filed an issue in the AMP plugin to address this: https://github.com/ampproject/amp-wp/issues/4678

I’ve also opened a pull request with a fix, including a test build you can use: https://github.com/ampproject/amp-wp/pull/4679#issuecomment-626375292

Nevertheless, you should still remove the BOM from your site as it can cause WordPress to be unable to send the HTTP response headers.

Thread Starter

(@kerm131)