304 Not Modified Use in conjunction with If Modified Since header Error

304 not modified use in conjunction with if modified

This preview shows page 55 - 59 out of 59 pages.

304 Not Modified Use in conjunction with If-Modified-Since header Error Responses 400 Bad Request Syntax error in request 401 Unauthorized Use in conjunction with WWW-Authenticate header 404 Not Found Resource not found Server Error Responses 500 Internal Server Error Generic server error. Server unable to indicate precise error. 501 Not Implemented Server knows it does not support the method. E.g. later version 502 Service Unavailable Server temporarily unable to respond. May be temp busy.
Image of page 55
HTTP Response Headers Selection of HTTP Response Headers Content-Encoding. Specify how the content is encoded and how the client should decode it. Predefine types include x-gzip (GNU zip) and “x - compress” (Unix zip) Content-Length. Specify the length of attached document. Content-Type. Specify the MIME type and sub-type entity. Based on the type, the browser perform one of the following actions: Content directly rendered by browser Content viewed using external viewer (E.g., MS Word) or plug-in No appropriate viewer available on client to view content 55
Image of page 56
HTTP Response Headers Expires. A way for sender to state the expiry date of a resource. A Client or proxy should not cache a response beyond the date/time. Last Modified. Gives the time and date the document was last changed. Location. Gives new location of requested document. Use for re-direction. Server. Descriptive information about the HTTP server. Contains vendor and version information. Set-Cookie. Contains name/value pair to be stored by browsers on client-side. 56
Image of page 57
Summary Web content Web page Elements Hypertext Transfer Protocol (HTTP) Web Browsers Website Coding in HTML XHTML More on HTTP 57
Image of page 58
Further Reading HTML5 Tutorial HTML vs XHTML View HTTP Response Header 58
Image of page 59

You've reached the end of your free preview.

Want to read all 59 pages?

  • Spring '19
  • World Wide Web, Hypertext Transfer Protocol

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture