Web Science/Part1: Foundations of the web/Hypertext Transfer Protocol/Content negotiation
Content negotiation
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In general you can use the edit button in the upper right corner of a section to edit its content.
Video
Script
Mainly the following function was added to SimpleWebServer.java. There are some slighte adoptions to the Request class but this is mainly code completion displayed inside the video.
private static String fetchAsciiFile(String path, String accept) {
try {
StringBuilder body = new StringBuilder(100000);
BufferedReader br = new BufferedReader(new FileReader(new File(System.getProperty("user.dir") + "/webdirectory" + path)));
String tmp = null;
if (accept != null && accept.equals("text/xml")){
body.append("<?xml version=\"1.0\" encoding=\"ASCII\" standalone=\"yes\"?>\n<playlist>\n");
}
while ((tmp = br.readLine())!= null){
if (accept == null)
body.append(tmp + "\n");
else if (accept.equals("text/plain")){
body.append(tmp + "\n");
} else if (accept.equals("text/xml")){
String []values = tmp.split(" - ");
body.append("<track id=\""+values[1]+"\">\n\t<time>"+values[0]+"</time>\n\t<artist>"+values[2]+"</artist>\n\t<title>"+values[3]+"</title>\n</track>\n");
}
}
if (accept != null && accept.equals("text/xml")){
body.append("</playlist>\n");
}
br.close();
return body.toString();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
- understand that you can request certain forms of content
- this is useful to understand how http could be extended e.g. by licence information similar to: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Quiz
Further reading
