From 226ce8760fb136c5b1e35dc364e3de561766f674 Mon Sep 17 00:00:00 2001
From: Danny van der Sluijs <danny.van.der.sluijs@infi.nl>
Date: Fri, 27 Feb 2026 13:28:24 +0100
Subject: [PATCH] Fix issue when http headers are already present (#843)

---
 src/JsonSchema/Uri/Retrievers/FileGetContents.php | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/JsonSchema/Uri/Retrievers/FileGetContents.php b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
index c03348bc..7d236317 100644
--- a/src/JsonSchema/Uri/Retrievers/FileGetContents.php
+++ b/src/JsonSchema/Uri/Retrievers/FileGetContents.php
@@ -27,6 +27,10 @@ class FileGetContents extends AbstractRetriever
      */
     public function retrieve($uri)
     {
+        if (function_exists('http_clear_last_response_headers')) {
+            http_clear_last_response_headers();
+        }
+
         $errorMessage = null;
         set_error_handler(function ($errno, $errstr) use (&$errorMessage) {
             $errorMessage = $errstr;