diff --git a/python-ecosys/requests/requests/__init__.py b/python-ecosys/requests/requests/__init__.py
index 74010291..b6bf515d 100644
--- a/python-ecosys/requests/requests/__init__.py
+++ b/python-ecosys/requests/requests/__init__.py
@@ -38,12 +38,15 @@ def request(
     url,
     data=None,
     json=None,
-    headers={},
+    headers=None,
     stream=None,
     auth=None,
     timeout=None,
     parse_headers=True,
 ):
+    if headers is None:
+        headers = {}
+
     redirect = None  # redirection url, None means no redirection
     chunked_data = data and getattr(data, "__next__", None) and not getattr(data, "__len__", None)
 
@@ -94,33 +97,49 @@ def request(
             context.verify_mode = tls.CERT_NONE
             s = context.wrap_socket(s, server_hostname=host)
         s.write(b"%s /%s HTTP/1.0\r\n" % (method, path))
+
         if "Host" not in headers:
-            s.write(b"Host: %s\r\n" % host)
+            headers["Host"] = host
+
+        if json is not None:
+            assert data is None
+            import ujson
+
+            data = ujson.dumps(json)
+
+            if "Content-Type" not in headers:
+                headers["Content-Type"] = "application/json"
+
+        if data:
+            if chunked_data:
+                if "Transfer-Encoding" not in headers and "Content-Length" not in headers:
+                    headers["Transfer-Encoding"] = "chunked"
+            elif "Content-Length" not in headers:
+                headers["Content-Length"] = str(len(data))
+
+        if "Connection" not in headers:
+            headers["Connection"] = "close"
+
         # Iterate over keys to avoid tuple alloc
         for k in headers:
             s.write(k)
             s.write(b": ")
             s.write(headers[k])
             s.write(b"\r\n")
-        if json is not None:
-            assert data is None
-            import ujson
 
-            data = ujson.dumps(json)
-            s.write(b"Content-Type: application/json\r\n")
+        s.write(b"\r\n")
+
         if data:
             if chunked_data:
-                s.write(b"Transfer-Encoding: chunked\r\n")
-            else:
-                s.write(b"Content-Length: %d\r\n" % len(data))
-        s.write(b"Connection: close\r\n\r\n")
-        if data:
-            if chunked_data:
-                for chunk in data:
-                    s.write(b"%x\r\n" % len(chunk))
-                    s.write(chunk)
-                    s.write(b"\r\n")
-                s.write("0\r\n\r\n")
+                if headers.get("Transfer-Encoding", None) == "chunked":
+                    for chunk in data:
+                        s.write(b"%x\r\n" % len(chunk))
+                        s.write(chunk)
+                        s.write(b"\r\n")
+                    s.write("0\r\n\r\n")
+                else:
+                    for chunk in data:
+                        s.write(chunk)
             else:
                 s.write(data)