Core Servlets and JavaServer Pages™

A.7. Generating the Server Response: HTTP Response Headers

Setting Arbitrary Headers

These are methods in HttpServletResponse. Set response headers before you send any document content to browser.

• public void setHeader(String headerName, String headerValue)

  Sets an arbitrary header.

• public void setDateHeader(String headerName, long milliseconds)

  Converts milliseconds since 1970 to a date string in GMT format.

• public void setIntHeader(String headerName, int headerValue)

  Prevents need to convert int to String before calling setHeader.

• addHeader, addDateHeader, addIntHeader

  Adds new occurrence of header instead of replacing. 2.2 only.

Setting Common Headers

• setContentType: Sets the Content-Type header. Servlets almost always use this. See Table 7.1 for ...