From a39cc611d442bf907880f481b8fdc61d33d53c10 Mon Sep 17 00:00:00 2001
From: Sandip Chandela <49310430+sandipklevu@users.noreply.github.com>
Date: Sat, 15 Jan 2022 06:33:23 +0530
Subject: [PATCH] Upcoming changes to HTTP header casing

https://developer.bigcommerce.com/changelog#publications/upcoming-changes-to-http-header-casing

For example, HTTP header names such as `X-Rate-Limit-Requests-Left` may instead be returned as `x-rate-limit-requests-left`. Per the HTTP specification (https://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2), HTTP header names should always be treated as case-insensitive, so we do not consider this to be a breaking change to the API.
---
 src/Bigcommerce/Api/Client.php | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/Bigcommerce/Api/Client.php b/src/Bigcommerce/Api/Client.php
index 00eb60fa..8d2b4eff 100644
--- a/src/Bigcommerce/Api/Client.php
+++ b/src/Bigcommerce/Api/Client.php
@@ -1336,7 +1336,10 @@ public static function getStore()
      */
     public static function getRequestsRemaining()
     {
-        $limit = self::connection()->getHeader('X-Rate-Limit-Requests-Left');
+        //See https://developer.bigcommerce.com/changelog#publications/upcoming-changes-to-http-header-casing
+        $limit = self::connection()->getHeader('x-rate-limit-requests-left')
+            ? self::connection()->getHeader('x-rate-limit-requests-left')
+            : self::connection()->getHeader('X-Rate-Limit-Requests-Left');
 
         if (!$limit) {
             $result = self::getTime();
@@ -1345,7 +1348,9 @@ public static function getRequestsRemaining()
                 return false;
             }
 
-            $limit = self::connection()->getHeader('X-Rate-Limit-Requests-Left');
+            $limit = self::connection()->getHeader('x-rate-limit-requests-left')
+                ? self::connection()->getHeader('x-rate-limit-requests-left')
+                : self::connection()->getHeader('X-Rate-Limit-Requests-Left');
         }
 
         return (int)$limit;