Resolve "Data ingress for context information for tiki-wiki"

Related to #39

api/context.php

@@ -31,6 +31,22 @@ function context($url, $domain, $content) {
 
     curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 
+    $headers = [];
+    curl_setopt($ch, CURLOPT_HEADERFUNCTION,
+        function($curl, $header) use (&$headers)
+        {
+            $len = strlen($header);
+            $header = explode(':', $header, 2);
+            if (count($header) < 2) // ignore invalid headers
+                return $len;
+
+            $key = strtolower(trim(array_shift($header)));
+            $headers[$key] = implode($header);
+
+            return $len;
+        }
+    );
+
     $response = curl_exec($ch);
     $http_status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 
@@ -40,6 +56,11 @@ function context($url, $domain, $content) {
         $response = '{"errors": ["SmartDataContext API not available"]}';
     }
 
+    if (array_key_exists("content-disposition", $headers)) {
+        header("Content-Type: " . $headers['content-type']);
+        header("content-disposition: " . $headers['content-disposition']);
+    }
+
     http_response_code($http_status);
     return $response;
 }