A.6. Generating the Server Response: HTTP Status Codes
Format of an HTTP Response
Status line (HTTP version, status code, message), response headers, blank line, document, in that order. For example:
HTTP/1.1 200 OK Content-Type: text/plain Hello World
Methods That Set Status Codes
These are methods in HttpServletResponse. Set status codes before you send any document content to browser.
public void setStatus(int statusCode)
Use a constant for the code, not an explicit int.
public void sendError(int code, String message)
Wraps message inside small HTML document.
public void sendRedirect(String url)
Relative URLs permitted in 2.2.
Status Code Categories
100-199: informational; client should respond with some other action.
200-299: request was successful. ...
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