title: What is the meaning of the term 'context' in Akka/Spray
body: <p>I am new to Akka/Spray and Scala. I see from akka docs that there is HttpRequest which is the Http Request class and there is also the RequestContext which according to akka docs</p>
  
  <blockquote>
    <p>encapsulates the context of an HttpRequest as it flows through a
    akka-http Route structure.</p>
  </blockquote>
  
  <p>May I know what is the meaning of the term 'context' here?</p>
  
  <p>Thanks</p>