Fixes #1302

lib/core/common.py

@@ -2281,7 +2281,7 @@ def findMultipartPostBoundary(post):
     candidates = []
 
     for match in re.finditer(r"(?m)^--(.+?)(--)?$", post or ""):
-        _ = match.group(1)
+        _ = match.group(1).strip().strip('-')
         if _ in done:
             continue
         else: