RFC-7230 states that a Content-Length header is normally sent in a POST request even when the value (length) is 0, indicating an empty payload body. Rex HTTP client failed to follow this spec, and caused some modules to fail (such as winrm_login). Fix #6398
Metasploit

The Metasploit Framework is released under a BSD-style license. See COPYING for more details.
The latest version of this software is available from: https://metasploit.com
Bug tracking and development information can be found at: https://github.com/rapid7/metasploit-framework
New bugs and feature requests should be directed to: http://r-7.co/MSF-BUGv1
API documentation for writing modules can be found at: https://rapid7.github.io/metasploit-framework/api
Questions and suggestions can be sent to: https://lists.sourceforge.net/lists/listinfo/metasploit-hackers
Installing
Generally, you should use the free installer, which contains all of the dependencies and will get you up and running with a few clicks. See the Dev Environment Setup if you'd like to deal with dependencies on your own.
Using Metasploit
Metasploit can do all sorts of things. The first thing you'll want to do
is start msfconsole, but after that, you'll probably be best served by
reading Metasploit Unleashed, the great community
resources, or the wiki.
Contributing
See the Dev Environment Setup guide on GitHub, which will walk you through the whole process from installing all the dependencies, to cloning the repository, and finally to submitting a pull request. For slightly more information, see Contributing.