Debug the HTTP requests in WordPress wp_remote_post() or wp_remote_get() with the help of `http_api_debug` hook.

debug-http-request.php

<?php
/**
 * Debug HTTP requests in WordPress
 * 
 * Fires after an HTTP API response is received and before the response is returned.
 * 
 * Output in `wp-content\debug.log` file:
 *
 * [24-Apr-2019 06:50:16 UTC] ------------------------------
 * [24-Apr-2019 06:50:16 UTC] https://downloads.wordpress.org/plugin/elementor.2.5.14.zip
 * [24-Apr-2019 06:50:16 UTC] {"errors":{"http_request_failed":["cURL error 28: Resolving timed out after 10518 milliseconds"]},"error_data":[]}
 * [24-Apr-2019 06:50:16 UTC] Requests
 * [24-Apr-2019 06:50:16 UTC] response
 * [24-Apr-2019 06:50:16 UTC] {"method":"GET","timeout":300,"redirection":5,"httpversion":"1.0","user-agent":"WordPress\/5.1.1; http:\/\/astra-sites-dev-test.sharkz.in","reject_unsafe_urls":true,"blocking":true,"headers":[],"cookies":[],"body":null,"compress":false,"decompress":true,"sslverify":true,"sslcertificates":"\/var\/www\/html\/astra-sites-dev-test.sharkz.in\/public_html\/wp-includes\/certificates\/ca-bundle.crt","stream":true,"filename":"\/tmp\/elementor.2.5.14-FOXodB.tmp","limit_response_size":null,"_redirection":5}
 * [24-Apr-2019 06:50:18 UTC] ------------------------------
 * 
 * @todo Change the `prefix_` and with your own unique prefix.
 * 
 * @since 1.0.0
 *
 * @param array|WP_Error $response HTTP response or WP_Error object.
 * @param string         $context  Context under which the hook is fired.
 * @param string         $class    HTTP transport used.
 * @param array          $r        HTTP request arguments.
 * @param string         $url      The request URL.
 * @return void
 * 
 * @since 1.0.0
 */
if( ! function_exists( 'debug_wp_remote_post_and_get_request' ) ) :
	function debug_wp_remote_post_and_get_request( $response, $context, $class, $r, $url ) {
		error_log( '------------------------------' );
		error_log( $url );
		error_log( json_encode( $response ) );
		error_log( $class );
		error_log( $context );
		error_log( json_encode( $r ) );
   	}
   add_action( 'http_api_debug', 'debug_wp_remote_post_and_get_request', 10, 5 );
endif;