Allow external host on http.php

@intrapixel Also, make sure you do NOT have WP_ACCESSIBLE_HOST or WP_HTTP_BLOCK_EXTERNAL defined in your wp-config.php file, or in a synology-helper plugin (although these should both be flagged in Site Health I believe)

@intrapixel Sorry for the delayed follow up (If you mention me by @dd32 in your reply I’ll be able to get back to you faster)

My problem is whit “reject_unsafe_urls” is marking unsafe if it is not on localhost. I want to now how write the right code to add arguments to set ww.wp.xz.cn as safe

By default, that IS a safe URL, so I think the problem here is that something (not WordPress itself) is triggering a failure case where it thinks that’s NOT safe.

A valid URL was not provided

That makes me think that wp_http_validate_url() is returning false, looking through that function, I suspect that the likely cause is a DNS resolution issue – if gethostbyname( 'ww.wp.xz.cn' ) doesn’t return an IP it can fail.

I think your best bet is to add some debugging and call wp_http_validate_url( 'https://ww.wp.xz.cn/' ) and see where it’s failing and returning false – that function call should return the URL there if it’s working correctly.

• This reply was modified 5 years, 5 months ago by Dion Hulse.

My apologies @intrapixel by debugging I meant adding something into the function so that where it looked like:

if ( condition1 ) {
   var_dump( "Condition 1 caused it to fail" );
   return false;
}

I’ve copied the code from WordPress 5.6 into a gist to add some debugging: https://gist.github.com/dd32/a9e9e89101f7e4a18200376649aa3b55

If you update the function with that and then run a few requests, you should see it output the reasoning for it being an invalid url.

I add the code to http.php and now the error I got is this… gethostbyname() failed to find correct DNS for site.

Right, so your problem is that DNS resolution is broken, as I alluded to above.

I’m not familiar enough with how synology works, but I think it’s docker based? you might need to force it to restart the instances/apps if they started before there was internet access or something.. or maybe even restarting the entire device..

Unfortunately this isn’t really a WordPress problem, but rather a PHP/Synology problem, so you might be able to get more help through a Synology support forum. Mentioning that gethostbyname( 'ww.wp.xz.cn' ) isn’t working.