java - 为什么 Servlet 中的重定向要求是绝对的？

Question

谁能告诉我为什么 servlet 中的重定向必须是绝对的？我找到的所有引用资料都告诉我它们必须是绝对的。

来自规范:

The sendRedirect method will set the appropriate headers and content body to redirect the client to a different URL. It is legal to call this method with a relative URL path, however the underlying container must translate the relative path to a fully qualified URL for transmission back to the client. If a partial URL is given and, for whatever reason, cannot be converted into a valid URL, then this method must throw an IllegalArgumentException.

Answer 1

Section 14.30 of RFC 2616 (HTTP/1.1，自已取代)Location header 中强制使用绝对 URL，用于指示重定向的“位置”。在最新版本的规范中，这一点已经放宽，但 Servlet 规范仍然需要向后兼容的行为。