diff --git a/lib/core/option.py b/lib/core/option.py
index 57860f39e..5ebd228bd 100644
--- a/lib/core/option.py
+++ b/lib/core/option.py
@@ -312,9 +312,9 @@ def _feedTargetsDict(reqFile, addedTargetUrls):
                     params = True
 
                 # Headers
-                elif re.search(r"\A\S+: ", line):
-                    key, value = line.split(": ", 1)
-                    value = value.replace("\r", "").replace("\n", "")
+                elif re.search(r"\A\S+:", line):
+                    key, value = line.split(":", 1)
+                    value = value.strip().replace("\r", "").replace("\n", "")
 
                     # Cookie and Host headers
                     if key.upper() == HTTP_HEADER.COOKIE.upper():