code to add and remove HTTP request header; removed from RequestParams.

add_and_remove_header.coffee

  HTTPHeader addHeader: ( HTTPHeader header ) -> 
    _headers ||= {}
    #supports multiple headers of the same name
    if headers[ header.name ] then header.value = headers[ header.name ].value + ";" + header.value
    
    headers[ header.name ] = header
    
    header
  
  #! make it so that if the user uses a header object with multiple values (";"), it acts accordingly
  #! needs a better abstraction
  #? allow for alternately named arguments for union types?  HTTPHeader|String header|headerName
  HTTPHeader removeHeader: ( HTTPHeader|String header ) ->
    
    if header isa String then return delete headers[ header ]
    
    if !headers[ header.name ] then throw new Error "Request Params > removeHeader > header not found: " + header.name
     
    currentHeaderValues = headers[ header.name ].value.split ";"
    
    headerValues = header.value.split ";"
    
    a = []
    for currentValue in currentHeaderValues
      v = currentValue
      for headerValue in headerValues
        if headerValue is currentValue then v = null
      if v then a.push v
    
    s = a.join ";"
    
    if s.length then headers[ header.name ].value = s
    else delete headers[ header.name ]
    header