title: WEBrick::HTTPStatus::LengthRequired error when accessing create method in controller
body: <p>I have a very simple controller set up:</p>
  
  <pre><code>class LibrariesController &lt; ApplicationController
  
  ...
  
    def create
      @user.libraries &lt;&lt; Library.new(params)
      @user.save
      render :json =&gt; "success!"
    end
  
  ...
  
  end
  </code></pre>
  
  <p>Basically, whenever I try to access the create method of LibrariesController using HTTParty.post I get a WEBrick::HTTPStatus::LengthRequired error on the server. The method is not even being accessed! Here is the stack trace (this is the full output server side - notice that the controller isn't even being accessed):</p>
  
  <pre><code>[2010-04-16 00:35:39] ERROR WEBrick::HTTPStatus::LengthRequired
  [2010-04-16 00:35:39] ERROR HTTPRequest#fixup: WEBrick::HTTPStatus::LengthRequired occured.
  [2010-04-16 00:35:39] ERROR NoMethodError: private method `gsub!' called for #&lt;Class:0x2362160&gt;
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/htmlutils.rb:17:in `escape'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/httpresponse.rb:232:in `set_error'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/httpserver.rb:70:in `run'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:162:in `start'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:95:in `start'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:92:in `each'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:92:in `start'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:23:in `start'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/1.8/webrick/server.rb:82:in `start'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/gems/1.8/gems/rack-1.0.1/lib/rack/handler/webrick.rb:14:in `run'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/gems/1.8/gems/rails-2.3.5/lib/commands/server.rb:111
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require'
      /usr/local/Cellar/ruby_187/1.8.7-p249/lib/ruby/site_ruby/1.8/rubygems/custom_require.rb:31:in `require'
      script/server:3
  </code></pre>
  
  <p>I'm running rails 2.3.5 and ruby 1.8.7. Any help would be greatly appreciated. Let me know if you need more details.</p>