From 70cfcbcc5251e131f04076caeb9893fcebcc6103 Mon Sep 17 00:00:00 2001
From: Ray Huang <leoman730@gmail.com>
Date: Tue, 24 Jan 2023 12:03:03 -0500
Subject: [PATCH] Add referer header.

---
 src/RequestOptions/RequestOptionsFactory.php | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/RequestOptions/RequestOptionsFactory.php b/src/RequestOptions/RequestOptionsFactory.php
index 1c43c5926..45d539635 100644
--- a/src/RequestOptions/RequestOptionsFactory.php
+++ b/src/RequestOptions/RequestOptionsFactory.php
@@ -70,6 +70,9 @@ private function normalize($options)
                 'X-Algolia-API-Key' => $this->config->getApiKey(),
                 'User-Agent' => UserAgent::get(),
                 'Content-Type' => 'application/json',
+                // For Algolia API restriction, add referer.
+                // See: https://discourse.algolia.com/t/api-key-referrer-restrictions-do-not-work/6574/3
+                'referer' => $_SERVER['HTTP_HOST'],                
             ],
             'query' => [],
             'body' => [],