Ship HTTP Proxy

http_proxy.php

@@ -0,0 +1,85 @@
+<?php
+/**
+ * HTTP Proxy implemented using AsyncHttp\Client
+ *
+ * This could be a replacement for the curl-based PHPProxy shipped
+ * in https://github.com/WordPress/wordpress-playground/pull/1546.
+ */
+
+use WordPress\AsyncHttp\Client;
+use WordPress\AsyncHttp\ClientEvent;
+use WordPress\AsyncHttp\Request;
+
+require __DIR__ . '/vendor/autoload.php';
+
+function get_target_url($server_data=null) {
+	if ($server_data === null) {
+		$server_data = $_SERVER;
+	}
+	$requestUri = $server_data['REQUEST_URI'];
+	$targetUrl = $requestUri;
+
+	// Remove the current script name from the beginning of $targetUrl
+	if (strpos($targetUrl, $server_data['SCRIPT_NAME']) === 0) {
+		$targetUrl = substr($targetUrl, strlen($server_data['SCRIPT_NAME']));
+	}
+
+	// Remove the leading slash
+	if ($targetUrl[0] === '/' || $targetUrl[0] === '?') {
+		$targetUrl = substr($targetUrl, 1);
+	}
+
+	return $targetUrl;
+}
+$target_url = get_target_url();
+$host = parse_url($target_url, PHP_URL_HOST);
+$requests = [
+	new Request(
+		$target_url,
+		[
+			'method' => $_SERVER['REQUEST_METHOD'],
+			'headers' => [
+				...getallheaders(),
+				'Host' => $host,
+			],
+			'body_stream' => $_SERVER['REQUEST_METHOD'] === 'POST' ? fopen('php://input', 'r') : null,
+		]
+	),
+];
+
+$client = new Client();
+$client->enqueue( $requests );
+
+$headers_sent = false;
+while ( $client->await_next_event() ) {
+	$request = $client->get_request();
+	switch ( $client->get_event() ) {
+		case Client::EVENT_GOT_HEADERS:
+			http_response_code($request->response->status_code);
+			foreach ( $request->response->get_headers() as $name => $value ) {
+				if(
+					$name === 'transfer-encoding' ||
+					$name === 'set-cookie' ||
+					$name === 'content-encoding'
+				) {
+					continue;
+				}
+				header("$name: $value");
+			}
+			$headers_sent = true;
+			break;
+		case Client::EVENT_BODY_CHUNK_AVAILABLE:
+			echo $client->get_response_body_chunk();
+			break;
+		case Client::EVENT_FAILED:
+			if(!$headers_sent) {
+				http_response_code(500);
+				echo "Failed request to " . $request->url . " – " . $request->error;
+			}
+			break;
+		case Client::EVENT_REDIRECT:
+		case Client::EVENT_FINISHED:
+	}
+	echo "\n";
+}
+