AFNetworking/AFNetworking — pull request #792 by zachwaugh (2013-02-09 16:58:35+00:00)
Title: Fix content type for extension from returning null

AFContentTypeForPathExtension can currently return null for certain file extensions (like .md), which can cause uploads to fail. This makes sure it always falls back to application/octet-stream if it can't find a better type.