• This is the release where I played around with Devel::NYTProf to figure
  where time was actually spent during the processing of requests with
  LWP. The methods that manipulated header objects stood out, so this
  release contains a few tweaks to make those parts faster.
  
• I also figured a few convenience methods to encode and decode the content
  of request/response objects would be in order.
  
• Should store "wire" headers field names with _ without translation.
  
• Test HTTP::Request->parse().
  
• Restore pre-5.815 behaviour of returning "400 Bad Request" [RT#39694]
  
• Rename the HTTP::Status constants to have HTTP_ prefix
  
• Detection of unsupported schemes was broken [RT#37637]
  
• Allow tainted methods to be forwarded to HTTP::Headers [RT#38736]
  
• Add strict mode to HTML::Form
  
• Fix test now that less warnings are generated.
  
• Add content_is_xml method
  
• Make split_header_words() lower case returned tokens/keys
  
• Avoid invoking AUTOLOAD on object destruction [RT#39852]
  
• Add decode() method to HTTP::Message
  
• Add encode() method to HTTP::Message
  
• Allow multiple fields to be set with push_header().
  
• Make content_type and content_is_xhtml methods faster
  
• Faster push_header()