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Web Basics

As a programmer, we implement complex solutions with complex technology but miss some basic knowledge of web protocols.

  • TCP / IP is state-full and session oriented connection: TCP / IP is the most commonly used internet protocol, also called Internet Protocol Suite.  When we open a Telnet session from a laptop to a Linux server, we initiate a persistent connection – the connection is persistent in that a connection between our laptop and Linux server is established at the very beginning of the telnet, and is never torn down unless the telnet session is terminated.
  • HTTP is stateless by design and not connection persistent – although, HTTP 1.1 protocol enhances and improves on the previous version by keeping established connections alive using Keep-alive messages – all of that is handled by our favorite web browsers under the covers.
  • Common HTTP response codes:
    • Response Codes Description
    200 Success; response header “Content-type” will elaborate on the content type mime-type (such as text/html, application/pdf etc.) Response body will contain the appropriate content
    404 Resource not found; no such resource found; URL contains an invalid path value
    500 Internal Server Error; request could not be understood
    302 Page has been moved; response header will contain the new location of the page in a separate “Location” header
    304 File not changed since; this response is sent back to a web browser when a conditional request was made by the browser in the form of “If Modified since” in the request header.
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