There is a bad actor hacking sites to create //1000 links, their software is creating links to various-urls//1000 (found in search) I'm assuming https://anpoopicj.sarahsdelight.co.uk/post/window-curtain-rods-without-nails/50880017 got hit by the bad actor and created the link.

It is best the link to example.com/valid-url//1000 results in a 404 page and example.com/valid-url continues to work as normal.

Google is aware of the bad actor ... https://www.seroundtable.com/google-search-console-404-error-report-1000-urls-36728.html ... twitter has many, many reports being sent to Google.

The standard protocol for links from bad actors is to not link back, the links to a 404 page will be harmless. Google has advised no need to disavow in mass. For this //1000 link spam.

I'm extra cautious

The .htaccess to 404 any page with // in the URL is:

RewriteEngine On
RewriteCond %{THE_REQUEST} \s[^?]*//
RewriteRule (.*) /$1 [L,R=404]

I'm doing this because I have 301 redirects in use for moved content and I don't want to redirect the spam links.

There is a bad actor hacking sites to create //1000 links, their software is creating links to various-urls//1000 (found in search) I'm assuming "anpoopicj.sarahsdelight.co[.]UK" got hit by the bad actor and created the link.

It is best the link to example.com/valid-url//1000 results in a 404 page and example.com/valid-url continues to work as normal.

Google is aware of the bad actor ... https://www.seroundtable.com/google-search-console-404-error-report-1000-urls-36728.html ... twitter has many, many reports being sent to Google.

The standard protocol for links from bad actors is to not link back, the links to a 404 page will be harmless. Google has advised no need to disavow in mass. For this //1000 link spam.

I'm extra cautious

The .htaccess to 404 any page with // in the page request URL, (not the HTTP protocol of course) is:

RewriteEngine On
RewriteCond %{THE_REQUEST} \s[^?]*//
RewriteRule (.*) /$1 [L,R=404]

I'm doing this because I have 301 redirects in use for moved content and I don't want to redirect the spam links.

There is a bad actor hacking sites to create //1000 links, software which is creating links to various-urls//1000 I'm assuming https://anpoopicj.sarahsdelight.co.uk/post/window-curtain-rods-without-nails/50880017 got hit by the bad actor and created the link.

It is best the link to example.com/valid-url//1000 results in a 404 page and example.com/valid-url continues to work as normal.

Google is aware of the bad actor ... https://www.seroundtable.com/google-search-console-404-error-report-1000-urls-36728.html ... twitter has many, many reports being sent to Google.

The standard protocol for links from bad actors is to not link back, the links to a 404 page will be harmless. Google has advised no need to disavow in mass. For this //1000 link spam.

There is a bad actor hacking sites to create //1000 links, their software is creating links to various-urls//1000 (found in search) I'm assuming https://anpoopicj.sarahsdelight.co.uk/post/window-curtain-rods-without-nails/50880017 got hit by the bad actor and created the link.

It is best the link to example.com/valid-url//1000 results in a 404 page and example.com/valid-url continues to work as normal.

Google is aware of the bad actor ... https://www.seroundtable.com/google-search-console-404-error-report-1000-urls-36728.html ... twitter has many, many reports being sent to Google.

The standard protocol for links from bad actors is to not link back, the links to a 404 page will be harmless. Google has advised no need to disavow in mass. For this //1000 link spam.

I'm extra cautious

The .htaccess to 404 any page with // in the URL is:

RewriteEngine On
RewriteCond %{THE_REQUEST} \s[^?]*//
RewriteRule (.*) /$1 [L,R=404]

I'm doing this because I have 301 redirects in use for moved content and I don't want to redirect the spam links.