Apache - set environment variable from proxy response header

Question

I am proxying apache requests to s3 and I want to rewrite the response header into a new crafted header

this is my configuration:

SetEnvIf x-amz-meta-link "(.*)" DYN_CSS=$0
Header set Link "</static_assets/stylesheets/application-%{DYN_CSS}e.css>; rel=preload; as=stylesheet" env=DYN_CSS

s3 Header is configured to be x-amz-meta-link: css

I am expecting the header in the final response to be

 </static_assets/stylesheets/application-css.css>; rel=preloadas=stylesheet"

but what I get is (empty var)

</static_assets/stylesheets/application-.css>;

Eran Chetzroni · Accepted Answer · 2017-04-19 21:08:30Z

4

If you are using version 2.4.10+ you can use: I would suggest using the "expr=..." form of the Header directive and using %{resp:x-amz-meta-link} to get the response header value

SetEnvIf only reads request headers, runs before response headers are available, etc.

edited Apr 19, 2017 at 21:08

Eran Chetzroni

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answered Apr 19, 2017 at 9:46

covener

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3 Comments

Eran Chetzroni Over a year ago

I am trying Header set foo "expr=%{resp:x-amz-meta-link}e", but I am getting foo: expr=(null)

Eran Chetzroni Over a year ago

I also tried Header set foo "expr=%{resp:x-amz-meta-link}" but this doesn't even pass the apache reload

Eran Chetzroni Over a year ago

probably this : serverfault.com/questions/748326/…

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