fetch_feed() returns WP_Error with "A valid URL was not provided"

[jaychris]

This seems to be the same bug as #24646, but is not resolved in 3.6.

I just upgraded to 3.6, but get this error when trying to fetch a feed from a URL that resolves to an internal address:

object(WP_Error)#657 (2) { ["errors"]=> array(1) { ["simplepie-error"]=> array(1) { [0]=> string(44) "WP HTTP Error: A valid URL was not provided." } } ["error_data"]=> array(0) { } }

I can fetch the url successfully using any number of local utilities, so it's able to respond correctly when called.

Both sites (client site and feed provider) reside on the same host (but NOT multi-site) and are behind a firewall, it's not possible to fetch via the external IP resolver.

[SergeyBiryukov]

Moving for investigation.

[nacin]

Replying to jaychris:

Both sites (client site and feed provider) reside on the same host (but NOT multi-site) and are behind a firewall, it's not possible to fetch via the external IP resolver.

This isn't something we can solve for in WordPress core without opening up a potential security hole.

You'll need to whitelist the target hosts using the http_request_host_is_external filter.