Setting Headers

The most common headers you want to set are

Header	Usage
Cache-Control	Either `no-cache` or `no-store` (no proxy store) and `max-age=fresh for these many seconds`
Connection	`keep-alive` to keep socket open or `close`. Servers handle this automagically.
Retry-After	Date or seconds to wait for server to start working.
Expires	Date when the documents will(may) change.
Location	The URL to which the document moved to.
WWW-Authenticate	Authorization scheme and realm.
Content-Encoding	Can be `gzip` or `compress`.

They can all be set with

public void HttpServletResponse.setHeader(String name, String value);

To avoid unnecessary conversions to string you can also use

public void HttpServletResponse.setDateHeader(String name, long date);
public void HttpServletResponse.setIntHeader(String name, int value);