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The Elbert HTTP Server

The Elbert HTTP Server. Adding languages, transfer encoding, charsets ; in other words: Content-Negotiation By: Shawn M. Jones. Updated FSM. Conditionals FSM. Negotiation FSM. Dissecting Filenames. <filename>. extension.language.charset.encoding Extension – e.g. txt, pdf , png

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The Elbert HTTP Server

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  1. The Elbert HTTP Server Adding languages, transfer encoding, charsets; in other words: Content-Negotiation By: Shawn M. Jones

  2. Updated FSM

  3. Conditionals FSM

  4. Negotiation FSM

  5. Dissecting Filenames <filename>.extension.language.charset.encoding Extension – e.g. txt, pdf, png Language – e.g. en, de, ja, ko Charset – e.g. jis, koi8-r, euc-kr Encoding – e.g. Z, gz

  6. Making the choice for negotiation • Get the right real filesystem directory from the URI and document home • Get the “filestem” from the end of the URI (e.g. index.html.en has a filestem of “index”) • Search that directory for a list of candidates for negotiation; if none found, return a 404 • Incorporate all of the q values from the Accept* headers into a dictionary of values for charset, language, etc. • Loop through the list of candidates • If the candidate matches a value from an Accept* header, add that q value to its score • If the q value is 0 the candidate is removed from the list • Determine the highest score for all candidates • Eliminate candidates who have a score less than the highest • If there is 1 candidate left, send a 200 with appropriate CN headers • If there is >1 candidate left, send a 300 • If there are no candidates left, send a 416

  7. Completed Work • 206 Partial Content • Testing 304 (was done already) • New 301 redirections, removed old 302 redirections • Request Headers: • Range • User-Agent • Referer • Negotiate: 1.0 • Accept (needs a few more tests) • Vary (use only if content negotiation performed) • Combined Log Format

  8. Completed Work • Response Headers: • Content-Language • en, es, de, ja, ko, ru • Content-Encoding • Compress, Gzip • Transfer-Encoding: chunked (every 2 lines for dynamically generated pages) • Accept-Ranges • Content-Range • Content-Type: add non-ASCII charsets • Alternatives (for 300) • 300 in response to Negotiate: 1.0 and Accept request header • No default q values

  9. Work Remaining • 300 Multiple Choices • Need to tie in additional Accept headers • 406 Not Acceptable • If no representations are suitable • entity with list of closest options • Request Headers: • Accept-Charset • Accept-Encoding • Accept-Language • Response Headers: • Content-Location • Alternatives (for 406) • TCN • Structured Etags

  10. Questions for Dr. Nelson • Status 416 is not in the assignment, should we implement it for bad ranges? Right now I give a 500, which doesn’t seem right. • Because there are no “default q values”, the following shouldn’t happen, right? It should return a 300?

  11. Accept dhcp65-74-196-93:~/Desktop/cs595-s06 mln$ telnet www.cs.odu.edu 80 Trying 128.82.4.2... Connected to xenon.cs.odu.edu. Escape character is '^]'. HEAD /~mln/teaching/cs595-s06/a3-test/fairlane HTTP/1.1 Host: www.cs.odu.edu Connection: close HTTP/1.1 200 OK Date: Mon, 13 Mar 2006 04:04:22 GMT Server: Apache/1.3.26 (Unix) ApacheJServ/1.1.2 PHP/4.3.4 Content-Location: fairlane.txt Vary: negotiate,accept TCN: choice Last-Modified: Mon, 13 Mar 2006 04:00:53 GMT ETag: "2288-c1-4414ee75;4414ee7a" Accept-Ranges: bytes Content-Length: 193 Connection: close Content-Type: text/plain Connection closed by foreign host.

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