diff --git a/src/pjdietz/WellRESTed/Message.php b/src/pjdietz/WellRESTed/Message.php
index f43fbba..d51acb2 100644
--- a/src/pjdietz/WellRESTed/Message.php
+++ b/src/pjdietz/WellRESTed/Message.php
@@ -148,6 +148,20 @@ abstract class Message
         return $this->headers;
     }
 
+    /**
+     * Return an array containing one string for each header as "field: value"
+     *
+     * @return string
+     */
+    public function getHeaderLines()
+    {
+        $lines = array();
+        foreach ($this->headers as $field => $value) {
+            $lines[] = sprintf('%s: %s', $field, $value);
+        }
+        return $lines;
+    }
+
     /**
      * Return the value of a given header, or false if it does not exist.
      *
diff --git a/src/pjdietz/WellRESTed/Request.php b/src/pjdietz/WellRESTed/Request.php
index 52f04e4..65ea068 100644
--- a/src/pjdietz/WellRESTed/Request.php
+++ b/src/pjdietz/WellRESTed/Request.php
@@ -265,6 +265,9 @@ class Request extends Message
 
         }
 
+        // Add headers.
+        curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headerLines);
+
         // Make the cURL request.
         $result = curl_exec($ch);