同事叫我帮忙解释一个问题:一个PHP生成的重定向请求,在Nginx日志里产生两种截然不同的记录,一种响应体大小是零个字节,另一种响应体大小是五个字节.
现在年纪大了,面对问题时的嗅觉不再灵敏,第一感觉零是正确的,心想是不是重定向后忘记退出了,后面还有内容输出,可是查了一下代码发现没有问题,代码如下:
<?php header('Location: /path'); exit;
在绕了一大圈之后,我猛然意识到环境是Nginx+PHP,响应没有「Content-Length」,数据是通过「Transfer-Encoding」分块发送的,所以重定向的空响应体实际类似:
0\r\n\r\n
不多不少,正好五个字节,细节大家可以参考Chunked transfer encoding,如此看来在此类空响应体的情况下,PHP主动输出一个「Content-Length:0」说不定会更好些.
那零个字节的响应如何解释呢?查询日志发现如下两种情况:
HEAD “/path HTTP/1.1″ 302 0
GET “/path HTTP/1.0″ 302 0
前者是HEAD请求,不需要响应体,后者是HTTP/1.0,不支持「Transfer-Encoding」.

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