Refined header code, added reverse recursive action

core/apirequest/headers.py

@@ -0,0 +1,21 @@
+import os
+def buildHeaders(definition, request, outputs, resolved):
+    headers = {}
+
+    for header_name, header_value in definition.headers.items():
+        value = header_value
+
+        if isinstance(value, dict) and "output" in header_value:
+            value = outputs[value["output"]]
+
+        if isinstance(value, dict) and "os" in header_value:
+            value = os.environ.get(value["os"])
+
+        if isinstance(header_value, dict) and "prefix" in header_value:
+            value = header_value["prefix"] + value
+
+        headers[header_name] = value
+
+        request["headers"] = headers
+
+    return headers