From 4ade9bd96097992d3986c98199ef63e4348decc0 Mon Sep 17 00:00:00 2001
From: Jordi Boggiano <j.boggiano@seld.be>
Date: Mon, 1 Feb 2021 12:55:55 +0100
Subject: [PATCH] Avoid accessing undefined indices, fixes #9654

---
 src/Composer/Util/Http/ProxyManager.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Composer/Util/Http/ProxyManager.php b/src/Composer/Util/Http/ProxyManager.php
index 693ef92ad..edd486ef3 100644
--- a/src/Composer/Util/Http/ProxyManager.php
+++ b/src/Composer/Util/Http/ProxyManager.php
@@ -87,7 +87,7 @@ class ProxyManager
         $options = array();
         $formattedProxyUrl = '';
 
-        if ($this->hasProxy && $this->fullProxy[$scheme]) {
+        if ($this->hasProxy && in_array($scheme, array('http', 'https'), true) && $this->fullProxy[$scheme]) {
             if ($this->noProxy($requestUrl)) {
                 $formattedProxyUrl = 'excluded by no_proxy';
             } else {