public SetIfModifiedSince() throws Exception {
serverSock = new ServerSocket(0);
int port = serverSock.getLocalPort();
Thread thr = new Thread(this);
thr.start();
Date date = new Date(new Date().getTime() - 1440000); // this time yesterday
URL url;
HttpURLConnection con;
// url = new URL(args[0]);
url = new URL("http://localhost:" + String.valueOf(port) + "/anything");
con = (HttpURLConnection) url.openConnection();
con.setIfModifiedSince(date.getTime());
con.connect();
int ret = con.getResponseCode();
if (ret == 304) {
System.out.println("Success!");
} else {
throw new RuntimeException(
"Test failed! Http return code using setIfModified method is:"
+ ret
+ "\nNOTE:some web servers are not implemented according to RFC, thus a failed test does not necessarily indicate a bug in setIfModifiedSince method");
}
}
public void run() {
try {
Socket s = serverSock.accept();
InputStream in = s.getInputStream();
byte b[] = new byte[4096];
// assume we read the entire http request
// (bad assumption but okay for test case)
int nread = in.read(b);
// check the date format by the position of the comma
String request = new String(b, 0, nread);
int pos = request.indexOf("If-Modified-Since:");
int respCode = 200;
if (pos != -1) {
pos += "If-Modified-Since:".length() + 4;
if (pos < nread) {
if (request.charAt(pos) == (char) ',') {
respCode = 304;
}
}
}
OutputStream o = s.getOutputStream();
if (respCode == 304) {
o.write("HTTP/1.1 304 Not Modified".getBytes());
} else {
o.write("HTTP/1.1 200 OK".getBytes());
}
o.write((byte) '\r');
o.write((byte) '\n');
o.write((byte) '\r');
o.write((byte) '\n');
o.flush();
} catch (Exception e) {
}
}