apache - 标题未设置 RewriteRule [R=302,L]

Question

目标:我正在尝试通过 htaccess 设置两个 header :

X-Robots-Tag: noindex, nofollow
Location: http://example.com/foo

概念验证:在 PHP 中可以做到这一点，效果很好:

header( "X-Robots-Tag: noindex, nofollow", true );
header( "Location: " .  $url, 302 );

问题:在我的 .htaccess文件我有这个:

# Do not let robots index anything from /out/
RewriteCond %{REQUEST_URI} ^/?out/?
Header set X-Robots-Tag "noindex, nofollow"

...

# Redirect /out/example/ type links
RewriteRule ^/?out/example/(.*)$ "http://example.com/$1" [R=302,L]

我确定某处有一个我没有看到的简单错误，但是如果我检查标题，例如 http://localhost/out/example/foo , Location header 已设置，但 X-Robots-Tag不是。

HTTP/1.1 302 Found
Date: Wed, 08 Jun 2016 23:59:18 GMT
Content-Type: text/html; charset=iso-8859-1
Transfer-Encoding: chunked
Connection: close
Location: http://example.com/foo
...

但是，触发 404(例如 http://localhost/out/404 )将设置适当的 header :

HTTP/1.1 404 Not·Found
Date: Wed, 08 Jun 2016 23:56:19 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: close
Vary: Accept-Encoding,User-Agent
X-Robots-Tag: noindex, nofollow    <--- set
...

问题出在哪儿？

Answer 1

解决方案是执行以下操作:

# Redirect /out/example/ type links
RewriteRule ^/?out/example/(.*)$ "http://example.com/$1" [R=302,L,E=OUTLINK:1]

# Add the robots header if E was set above
Header always set X-Robots-Tag "noindex, nofollow" env=OUTLINK

注:这是一个挑战，因为最初的解决方案是将“noindex”标题添加到杀死我网站的所有内容中。我希望这对 future 的人有所帮助。