Tracking WordPress Remote HTTP Requests

UPDATE: You can find improved code in this newer blog post. Use that instead.

I thought I’d share a bit of code that I run on my local WordPress test install to see when WordPress is contacting another website. I originally wrote this to help debug my oEmbed code, but it’s useful for a wide variety of purposes. 🙂


if ( !defined('DOING_AJAX') )
	add_filter( 'http_request_args', 'debug_http_api', 10, 2 );

function debug_http_api( $r, $url ) {
	echo '<p style="text-align:left">HTTP API was used to fetch <code>' . esc_html( $url ) . '</code></p>';

	return $r;


The above code will output something like this any time a HTTP request is made using the HTTP API, but only if the request was not made from an AJAX handling script (as it will break the AJAX response):

HTTP API was used to fetch

While I’m using a filter to do this, I’m actually using the filter much like an action as I’m not modifying the passed data but merely using the filter as a place to hook in and catch the URL.

One thought on “Tracking WordPress Remote HTTP Requests

  1. Pingback: WordPress Picks for the Week [02/17] | Techtites

Leave a Reply