<addheader name1=value1 name2=value2 ...>
* where name is the name of an HTTP header, and
* value is its value. If no value is provided, then
* the header is removed. If multiple name/value pairs are provided,
* they are processed in arbitrary order.
*
* Special headers.
* If a "location" header is added, the status code is automatically
* set to "302". If the value doesn't start with "http://" or
* "https://", then the
* value is turned into an absolute URL
* by prepending the the hostname (and the path from the document
* root if the value doesn't start with '/'.
* Removing location headers is ill-advised.
*
* The special header status is used to set the status code. *
* If the attribute nocontent is present, the http header
* status is set to 204 no content. This causes the browser to
* ignore the contents of the page.
*
* If a last-modified header is present and the value is an
* integer, it is taken to be the time (in ms since the epoch), and
* converted to the proper format.
*
* The values are subject to ${...} substitutions.
*
Note: Setting invalid headers will lead to unpredictable results,
*
* @author Stephen Uhler
* @version @(#) AddHeaderTemplate.java 2.9@(#)
*/
public class AddHeaderTemplate extends Template {
/**
* Process the special addheader tag.
*/
public void
tag_addheader(RewriteContext hr) {
Enumeration e = hr.keys();
while (e.hasMoreElements()) {
String key = (String) e.nextElement();
String value = hr.get(key);
hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix +
"addheader: " + key + ": " + value);
if (key.equals("nocontent")) {
hr.request.setStatus(204);
} else if (key.equals("last-modified")) {
try {
int tm = Integer.decode(value).intValue();
value = HttpUtil.formatTime(tm);
} catch (Exception ex) {}
hr.request.addHeader(key,value);
} else if (key.equals("status")) {
try {
hr.request.setStatus(Integer.decode(value).intValue());
} catch (Exception ex) {
debug(hr,"Invalid status code" + ex.getMessage());
}
} else if (value.equals("")) {
hr.request.responseHeaders.remove(key);
} else {
if (key.equals("location")) {
hr.request.setStatus(302);
if (!(value.startsWith("http://") ||
value.startsWith("https://"))) {
if (!value.startsWith("/")) {
// relative to currentl url
value = hr.request.url.substring(0,
hr.request.url.lastIndexOf("/")) + "/" +
value;
}
value =hr.request.serverUrl() + FileHandler.urlToPath(
value);
}
hr.request.log(Server.LOG_DIAGNOSTIC, hr.prefix +
"redirecting to: " + value);
}
hr.request.addHeader(Format.subst(hr.request.props,key),value);
}
}
hr.killToken();
}
}