HTTP Headers

HTTP Headers

HTTP Header Fields

  • Hypertext Transfer Protocol (HTTP) request and response message header components
  • Colon-separated name-value pairs in clear-text string format
  • Transmitted after the request or response line
  • Used to define the operating parameters of an HTTP transaction
  • A core set of fields is standardized by the Internet Engineering Task Force (IETF) in RFC 2616
  • The core set of fields must be implemented by all HTTP-compliant protocol implementations
  • View response headers online at


  • An integrated HTTP sniffer for IE and Firefox
  • Displays what HTTP traffic is triggered when a web page is accessed
    • Headers and cookies
    • URLs and methods (e.g. GET, POST, etc)
    • HTTP status codes and errors
    • Redirections
    • Parameters sent in a query strings and POST requests
    • Network size of the HTTP response including headers
    • Chunked encoding
  • Useful for monitoring HTTP and HTTPS without using proxy servers or changing network settings


  • An older free and unsupported utility from Microsoft with a graphical user-interface
  • Enables users to view data that is not ordinarily displayed in the Web browser
    • HTTP request headers 
    • HTTP response headers 
  • Useful for troubleshooting connectivity issues between IIS and Web clients