[5.3] Enhance header handling in transport classes to support array values - (joomla#46078)

Co-authored-by: Martina  Scholz <[email protected]>

Author: bembelimen

libraries/src/Http/Transport/CurlTransport.php

@@ -99,7 +99,13 @@ public function request($method, UriInterface $uri, $data = null, array $headers
 
         if (isset($headers)) {
             foreach ($headers as $key => $value) {
-                $headerArray[] = $key . ': ' . $value;
+                if (\is_array($value)) {
+                    foreach ($value as $header) {
+                        $headerArray[] = "$key: $header";
+                    }
+                } else {
+                    $headerArray[] = "$key: $value";
+                }
             }
 
             // Add the headers string into the stream context options array.

libraries/src/Http/Transport/SocketTransport.php

@@ -97,7 +97,13 @@ public function request($method, UriInterface $uri, $data = null, array $headers
         // If there are custom headers to send add them to the request payload.
         if (\is_array($headers)) {
             foreach ($headers as $k => $v) {
-                $request[] = $k . ': ' . $v;
+                if (\is_array($v)) {
+                    foreach ($v as $value) {
+                        $request[] = "$k: $value";
+                    }
+                } else {
+                    $request[] = "$k: $v";
+                }
             }
         }
 

libraries/src/Http/Transport/StreamTransport.php

@@ -110,7 +110,13 @@ public function request($method, UriInterface $uri, $data = null, array $headers
 
         if (isset($headers)) {
             foreach ($headers as $key => $value) {
-                $headerEntries[] = $key . ': ' . $value;
+                if (\is_array($value)) {
+                    foreach ($value as $header) {
+                        $headerEntries[] = "$key: $header";
+                    }
+                } else {
+                    $headerEntries[] = "$key: $value";
+                }
             }
 
             // Add the headers string into the stream context options array.