Set the User-Agent regardless of GET or POST (#382)

Author: mig5

CHANGELOG.md

@@ -5,6 +5,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [unreleased]
+* User-Agent is set for any HTTP method in fetchURL() (not just POST). #382
 * Update visibility of getWellKnownConfigValue to protected. #363
 * Fixed issue on authentication for php8. #354
 * Support for signed and encrypted UserInfo response. #305

src/OpenIDConnectClient.php

@@ -1367,7 +1367,6 @@ protected function fetchURL(string $url, string $post_body = null, array $header
             // Allows to keep the POST method even after redirect
             curl_setopt($ch, CURLOPT_CUSTOMREQUEST, 'POST');
             curl_setopt($ch, CURLOPT_POSTFIELDS, $post_body);
-            curl_setopt($ch, CURLOPT_USERAGENT, $this->getUserAgent());
 
             // Default content type is form encoded
             $content_type = 'application/x-www-form-urlencoded';
@@ -1381,6 +1380,9 @@ protected function fetchURL(string $url, string $post_body = null, array $header
             $headers[] = "Content-Type: $content_type";
         }
 
+        // Set the User-Agent
+        curl_setopt($ch, CURLOPT_USERAGENT, $this->getUserAgent());
+
         // If we set some headers include them
         if(count($headers) > 0) {
             curl_setopt($ch, CURLOPT_HTTPHEADER, $headers);